{"id":63,"date":"2010-04-14T16:25:10","date_gmt":"2010-04-14T08:25:10","guid":{"rendered":"http:\/\/www.flexiblecircuitpcb.com\/blog\/?p=63"},"modified":"2010-08-14T16:35:10","modified_gmt":"2010-08-14T08:35:10","slug":"pcb-surface-treatments","status":"publish","type":"post","link":"https:\/\/www.flexiblecircuitpcb.com\/blog\/pcb-surface-treatments\/","title":{"rendered":"PCB surface treatments"},"content":{"rendered":"

Bare copper itself is very good solderability, but is easily exposed to air oxidation, and susceptible to contamination. This is also the PCB surface treatment<\/strong> must be the reason.<\/p>\n

1. HASL
\nHot-air solder leveling. The most common PCB<\/a> surface treatment menthod. Lead and lead-free should be considered.<\/p>\n

2. OSP
\nOrganic solderability protective coating (OSP, Organic solderability preservative) is an organic coating to prevent oxidation of copper in the welding before, that is to protect PCB<\/a>(printed circuit board<\/a>)\u00a0pad solderability from destruction.<\/p>\n

3. ENIG
\nNickel Immersion Gold. The copper surface is plated of Ni\/Au. The deposition thickness of the inner Ni layer is generally 3~6um, the deposition thickness of the outer Au thin, usually 0.05 ~ 0.1um. Ni as the barrier layer between Cu and soldering tin. Welding, outside Au in the solder which melts rapidly with soldering tin and then turn into Ni\/Sn intermetallic compounds with inner Ni. The gold-plated to prevent Ni oxidation during storage or passive, it should be enough gold plating density, the thickness can not be too thin.<\/p>\n

4. Immersion Silver
\nImmersion silver process through the thin (about 0.1~0.4um) and dense to provide a layer of silver deposited organic protective film, the surface of the silver with the greatly extended life. Immersion Silver surface is very flat and very good with weldability.<\/p>\n

5. Immersion Tin
\nOnly used for two reasons for immersion tin process: first, the surface is very flat, coplanarity good; the other is lead-free. But in the immersion tine process easy to be with Cu\/Sn intermetallic compound, Cu \/ Sn intermetallic is with poor solderability.<\/p>\n

These are five main PCB<\/a> surface treatments, since each have their own unique surface treatment technology, application is not quite the same.<\/p>\n","protected":false},"excerpt":{"rendered":"

Bare copper itself is very good solderability, but is easily exposed to air oxidation, and susceptible to contamination. This is also the PCB surface treatment must be the reason.<\/p>\n

Read more »<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[33],"class_list":["post-63","post","type-post","status-publish","format-standard","hentry","category-pcb","tag-pcb-surface-treatments"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/posts\/63","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/comments?post=63"}],"version-history":[{"count":1,"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/posts\/63\/revisions"}],"predecessor-version":[{"id":64,"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/posts\/63\/revisions\/64"}],"wp:attachment":[{"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/media?parent=63"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/categories?post=63"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.flexiblecircuitpcb.com\/blog\/wp-json\/wp\/v2\/tags?post=63"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}