Immersion Silver. Thanks, Paul.
-----邮件原件-----
发件人: Paul Reid [mailto:[log in to unmask]]
发送时间: 2009年5月29日 20:40
收件人: TechNet E-Mail Forum; Charming Chan
主题: RE: [TN] Looking for opinions on separation/delamination between
copper land and dielectric material.
Hi Charming,
What is the surface finish on the PWB?
Paul Reid
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Charming Chan
Sent: Friday, May 29, 2009 4:46 AM
To: [log in to unmask]
Subject: [TN] Looking for opinions on separation/delamination between copper
land and dielectric material.
Hello All,
Our guys ran a thermal shock test to verify solder joint reliability of a
TSSOP component. The micro-section shows that there is a minor crack at the
toe side of the solder joint and a separation(delamination) between the
copper land and the dielectric material.
My question is,
Where did the separation/delamination occur? PCB fab house, PCB assembly
house, or thermal shock test?
If the separation/delamination occurred at pcb fab house, then, what's the
possible root cause gonna be?
If the separation/delamination occurred at thermal shock test or pcb
assembly house, then, is it caused by CTE mismatch between pcb base
material, solder alloy, and gull-wing footprint? How to improve on that?
Brain storm, and any input is appreciated.
I will get the micro-section picture posted once I get it. Thank you all.
Best Regards
Charming Chan
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