Electronics Forum | Sun Mar 16 08:41:50 EDT 2008 | davef
Dennis: What do you do when you receive a black pad board? How do you rework it?
Electronics Forum | Fri Mar 14 11:04:54 EDT 2008 | herman
Samir, To correct some misconceptions on the answers to your question, and "what you know from experience": With both ENIG (Electroless Nickel/Immersion Gold-IAu) and IAg (immersion silver), soldering does not take place to the gold or the silver. Wh
Electronics Forum | Thu Mar 06 11:48:09 EST 2008 | muse95
Black pad with IAg??? Tarnish is NOT black pad. Tarnish is usually just some silver sulfide on the surface and can also usually be soldered through, by using a little additional, or slightly more agressive, flux, and still make a good quality solder
Electronics Forum | Thu Mar 06 14:34:16 EST 2008 | srmlan
I have not had problems with ENiG panels, but they were made state side. We had Trace Labs cross-section them and found no problems. Whats this about yellow nails? Mine are full of grease from constantly having to fix the Jeep. I would try to pop my
Electronics Forum | Sun Aug 03 08:27:41 EDT 2008 | davef
IPC-4553, Specification for Immersion Silver Plating for Printed Circuit Boards, 1.4.1 Solderability. This primary function of IAg is to provide a solderable surface finish, suitable for all surface mount and through-hole assembly applications and wi
Electronics Forum | Fri Sep 12 17:07:05 EDT 2008 | davef
While you're waiting for others to reply, check these recently posted threads on discolored immersion silver [IAg] here on SMTnet: * http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=56220 * http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Mes
Electronics Forum | Sat Mar 15 09:55:33 EDT 2008 | ppcbs
As a rework house to contract manufacturers, a majority of the BGA rework we receive is failing due to Black Pad issues. Recently we have been taking in a lot of consumer products that have parts just falling off the lead free boards that are assemb
Electronics Forum | Sun Feb 17 17:55:21 EST 2019 | davef
Each time that you cook imm surfaces, you give-up coating thickness. Spec IAg can take maybe 4 thermal cycles ... [that's what I remember but those could be PbSn, not SAC cycles]. Anyhow, the more that you decrease coating thickness, the more that Cu
Electronics Forum | Tue Jan 29 15:48:31 EST 2002 | davef
On his site "SMT In Focus", our friend Brian Sloth Blitzen lists the following sampling of lead-free [no lead] links: * Alpha Metals: http://www.alphametals.com/lead_free/index.html * Circuits Assembly magazine: http://www.circuitsassembly.com/db_ar
Electronics Forum | Tue Oct 03 22:48:21 EDT 2006 | C.K. the Flip
It sounds as if this Sn100c HASL process is still in its infancy requiring further process development and characterization..weather its a better more active flux or a different profile... Given your situation of the Sn100c coating actually "repellin
