We use Immersion Silver for all fine pitch boards 25 mil or less. It's flat, less costly than HASL, is a drop in replacement for HASL at oven and wave solder, has good shelf life and electrical properties. We build many BGA assemblies.
Dave C.
-----Original Message-----
From: gaby [mailto:[log in to unmask]]
Sent: Thursday, May 29, 2003 6:10 PM
To: [log in to unmask]
Subject: Re: [TN] Enig? HASL?

http://www.circuitree.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2133,97634,00.html
----- Original Message -----
From: [log in to unmask] href="mailto:[log in to unmask]">Ervin Weisz
To: [log in to unmask] href="mailto:[log in to unmask]">[log in to unmask]
Sent: Thursday, May 29, 2003 11:38 PM
Subject: [TN] Enig? HASL?

Dear Technetters,
As many others, I am considered about the "ENIG vs. HASL vs. another few finishes".
I wonder what do people specify in those industries that require 0 failures: defense industry, automotive, aerospace, etc.
 
Mainly, I would like to know what do companies in such fields specify for boards that are populated with small BGAs (0.032" pitch and lower), also known as CSPs.Boards that have very high reliability requirements and have advances packages - what surface finish is required/recommended for the boards ??
 
I would appreciate links to existing specs., personal information, or anything you can spare on this subject.
 
Thanks,
Yehuda Weisz
Process Engineer - PCB production

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