tag:blogger.com,1999:blog-67733358878681207392023-11-15T06:39:56.655-08:00PCB International BlogSolutions to all your printed circuit board needsUnknownnoreply@blogger.comBlogger3125tag:blogger.com,1999:blog-6773335887868120739.post-45944707128261972252010-01-30T13:31:00.001-08:002010-01-30T13:31:55.910-08:00PCB International: An IntroductionHello, my name is Michael. I am the writer for the official blog of PCB International. First I'd like to tell you a little about our company. PCB International is a west-coast based Printed Circuit Board supplier. We are equipped with leading edge technology to meet with all your PCB needs. We specialize in the whole breadth of orders from prototype to production runs. More information can be found at http://www.pcbinternational.com.<br /><br />The goal of this blog is to allow our current and prospective customers and anyone else interested in PCBs a glimpse into the happenings at our company and also to comment on everything PCB related. This blog will be updated regularly so be sure to check back frequently. Comments are very much encouraged.Unknownnoreply@blogger.comtag:blogger.com,1999:blog-6773335887868120739.post-41004177225691358432009-12-19T13:34:00.001-08:002009-12-19T13:34:44.190-08:00TechnoratiTKUQWKKJA2KEUnknownnoreply@blogger.comtag:blogger.com,1999:blog-6773335887868120739.post-12823455888544757702009-12-16T21:13:00.000-08:002009-12-16T21:55:58.610-08:00Surface Finish Pros and Cons<span class="Apple-tab-span" style="white-space:pre"><span class="Apple-style-span" style=" white-space: normal; color: rgb(51, 51, 51); font-family:'Times New Roman', serif;"><span class="Apple-style-span" style="font-size:medium;">As a reminder, one of the focuses of this blog is to go over the technologies involved in PCB manufacturing. Today, I'd like to talk about a critical component in printed circuit board manufacturing - the surface finish. Surface finishes form a crucial interface between the components to be mounted and the interconnection circuitry. </span></span></span><div><span class="Apple-style-span" style="font-family:'Times New Roman', serif;color:#333333;"><br /></span></div><div><span class="Apple-tab-span" style="white-space:pre"><span class="Apple-style-span" style=" white-space: normal; color: rgb(51, 51, 51); font-family:'Times New Roman', serif;"><span class="Apple-style-span" style="font-size:medium;">As its most essential function, the final finish process is intended to provide exposed copper circuitry with a protective coating in order to preserve solderability. In a more expanded view, the final finish coating is required to meet dozens of functional criteria, including solderability, environmental, electrical, physical, and durability demands. The past decades have brought about a wholesale transformation in this segment of the industry - a wide variety of functional, environmental, engineering, cost, productivity, and failure mode issues have contributed to this frequent change. </span></span></span></div><div><span class="Apple-style-span" style="font-family:'Times New Roman', serif;color:#333333;"><br /></span></div><div><span class="Apple-tab-span" style="white-space:pre"><span class="Apple-style-span" style=" white-space: normal; color: rgb(51, 51, 51); font-family:'Times New Roman', serif;"><span class="Apple-style-span" style="font-size:medium;">Nonetheless, years of manufacturing experience and constant innovation has enabled PCB International to be a leading edge provider for all your surface finish needs. Including, but not limited to: HASL, ENIG (Immersion Gold), Organic solderability preservative (OSP), immersion silver, immersion tin, </span><span style="color: rgb(35, 31, 32); "><span class="Apple-style-span" style="font-size:medium;">Electrolytic nickel/electrolytic gold, electroless gold, etc.</span></span><span class="Apple-style-span" style="font-size:medium;"> Below lists the pros and cons of a number of the more popular surface finishes - most relevant in today’s applications. Please note that all of these are available at PCB International!</span></span><span class="Apple-style-span" style=" white-space: normal; color: rgb(51, 51, 51); line-height: 19px; font-family:Verdana, sans-serif;font-size:13px;"><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span class="Apple-style-span" style=" ;font-family:'Times New Roman', serif;"></span></p><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="551" style="width: 413pt; margin-left: 4.65pt; border-collapse: collapse; "><tbody><tr style="height: 15pt; "><td width="551" nowrap="" colspan="2" valign="bottom" style="width: 413pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pros & Cons of HASL<o:p></o:p></span></b></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pro<o:p></o:p></span></b></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Cons<o:p></o:p></span></b></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Inexpensive<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Environment Consequences<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Cu/Sn solderjoint<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Poor fine pitch assembly<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Re-workable<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Solder bridging<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Widespread availability<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Plugged PTH<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Thermal damage to board<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Not Flat<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Thick intermetallics<o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;"><o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="551" nowrap="" colspan="2" valign="bottom" style="width: 413pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pros & Cons of Immersion Gold (ENIG)<o:p></o:p></span></b></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pros<o:p></o:p></span></b></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Cons<o:p></o:p></span></b></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Pb Free<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Comparatively expensive<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">No copper dissolution<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Brittle Ni/Sn solderjoint<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Surface contacts<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Signal loss at RF frequencies<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Long shelf life<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Black-pad, black-line nickel<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Strong PTH "rivet"<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Solder Mask "attack"<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Fine pitch assembly<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Not re-workable<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="265" nowrap="" valign="bottom" style="width: 198.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Widespread availability<o:p></o:p></span></p></td><td width="286" nowrap="" valign="bottom" style="width: 214.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Comparatively complicated<o:p></o:p></span></p></td></tr></tbody></table><p></p><span class="Apple-style-span" style=" ;font-family:'Times New Roman', serif;"><p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; line-height: normal; "><span style=" ;font-size:12pt;"><o:p></o:p></span></p><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="551" style="width: 413pt; margin-left: 4.65pt; border-collapse: collapse; "><tbody><tr style="height: 15pt; "><td width="551" nowrap="" colspan="2" valign="bottom" style="width: 413pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><br /></b></p><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pros and Cons of Organic Solderability Preservative (OSP)<o:p></o:p></span></b></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pros<o:p></o:p></span></b></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Cons<o:p></o:p></span></b></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Least expensive finish<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Handling sensitive<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Flat, fine pitch assembly<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Poor PTH soldering<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">relatively simple process<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Shorter shelf life<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Widespread availability<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Degrades with multiple reflow<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Cu/Sn solderjoint<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">No direct thickness measurement<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Pb free<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">High surface contact resistance<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">High productivity at fabrication<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Not inspect able prior to assembly<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Re-workable<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Exposed copper on final assembly<o:p></o:p></span></p></td></tr></tbody></table><p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; line-height: normal; "><span style=" ;font-size:12pt;"><o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; line-height: normal; "><span style=" ;font-size:12pt;"><o:p></o:p></span></p><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="551" style="width: 413pt; margin-left: 4.65pt; border-collapse: collapse; "><tbody><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pros and Cons of Immersion Silver<o:p></o:p></span></b></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pros<o:p></o:p></span></b></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Cons<o:p></o:p></span></b></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Flat, fine-pitch assembly<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Tarnish<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Comparatively inexpensive finish<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Attack at solder mask interface<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">No Pb<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Dendrite formation<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Re-workable<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Exposed silver can corrode<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Easy thickness measurement<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Solder joint microvoid history<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Excellent surface contact functionality<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Handling Sensitive<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">No degradation with<span> </span>multiple soldering reflow<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td></tr><tr style="height: 15pt; "><td width="271" nowrap="" valign="bottom" style="width: 203.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">High productivity at fabrication<o:p></o:p></span></p></td><td width="280" nowrap="" valign="bottom" style="width: 209.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td></tr></tbody></table><p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; line-height: normal; "><span style=" ;font-size:12pt;"><o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; line-height: normal; "><span style=" ;font-size:12pt;"><o:p></o:p></span></p><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="551" style="width: 413pt; margin-left: 4.65pt; border-collapse: collapse; "><tbody><tr style="height: 15pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pros and Cons of Immersion Tin<o:p></o:p></span></b></p></td><td width="274" nowrap="" valign="bottom" style="width: 205.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td></tr><tr style="height: 15pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td><td width="274" nowrap="" valign="bottom" style="width: 205.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "></td></tr><tr style="height: 15pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Pros<o:p></o:p></span></b></p></td><td width="274" nowrap="" valign="bottom" style="width: 205.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><b><span style=" ;font-family:'Times New Roman', serif;color:black;">Cons<o:p></o:p></span></b></p></td></tr><tr style="height: 15.75pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15.75pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Flast, fine-pitch assembly<o:p></o:p></span></p></td><td width="274" nowrap="" valign="bottom" style="width: 205.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15.75pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Handling sensitive<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Comparatively inexpensive finish<o:p></o:p></span></p></td><td width="274" nowrap="" valign="bottom" style="width: 205.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Solder mask attack<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">No Pb<o:p></o:p></span></p></td><td width="274" nowrap="" valign="bottom" style="width: 205.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Corrosion of Whiskers<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Functionality<o:p></o:p></span></p></td><td width="274" nowrap="" valign="bottom" style="width: 205.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Difficult thickness measurement<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Multiple reflow soldering<o:p></o:p></span></p></td><td width="274" nowrap="" valign="bottom" style="width: 205.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Degredation with time/heat<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Less visible tarnish<o:p></o:p></span></p></td><td width="274" nowrap="" valign="bottom" style="width: 205.25pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Use of thiourea<o:p></o:p></span></p></td></tr><tr style="height: 15pt; "><td width="277" nowrap="" valign="bottom" style="width: 207.75pt; padding-top: 0in; padding-right: 5.4pt; padding-bottom: 0in; padding-left: 5.4pt; height: 15pt; "><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><span style=" ;font-family:'Times New Roman', serif;color:black;">Reworkable<o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; "><a href="http://www.pcbinternational.com/" style="color: rgb(102, 102, 153); ">http://www.pcbinternational.com</a></p></td></tr></tbody></table></span></span></span></div>Unknownnoreply@blogger.com