Joe,
I would agree with George on both counts. In any case, I wouldn't choose HASL. It doesn't deposit evenly. In the case of your fine pitch and small components, you could end up with reliability issues.
Thank you,
Paul Black
Manufacturing Engineer
Kronos
E-mail: [log in to unmask]
Voice: (978) 947-1520
Fax: (978) 244-0568
www.kronos.com
Improving the Performance of People and Business(tm)
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Wenger, George M.
Sent: Monday, September 27, 2004 1:21 PM
To: [log in to unmask]
Subject: Re: [TN] ENIG vs. HASL plating with 0.5 mm pitch QFN components
Joe,
Were you asked to recommend the type of pwb plating that is best for your simple board or were you only given two choices to pick from? If I had to pick from the two choices I'd pick ENIG. If I had to make a recommendation I wouldn't recommend either. My preference would be immersion silver.
Regards,
George
George M. Wenger (908)-546-4531
Reliability / FMA Engineer
Base Station and Subsystems Group
Andrew Corporation, 40 Technology Drive, Warren, NJ 07059
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Macko, Joe @ IEC
Sent: Monday, September 27, 2004 1:08 PM
To: [log in to unmask]
Subject: [TN] ENIG vs. HASL plating with 0.5 mm pitch QFN components
Fellow techs,
I have been asked to recommend the type of pwb plating that is best for a
simple board with only a few components. The finest pitch component is a
QFN, 64 pads, 0.5 mm pitch. There are some 0402 resistors and capacitors as
well.
My 2 choices are HASL or ENIG. Would someone please comment on which is
best for 0402 and 0.5 mm QFN type components.
Thanks in advance.
joe
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