Sorry, I should have corrected the title for this post..

regards,

Phil Dutton C.I.D.+ 
Senior CAD Technician 
IPC Certified Interconnect Designer 
BAE Systems Australia 

-----Original Message-----
From: DUTTON, Phil 
Sent: Friday, 23 November 2012 1:21 PM
To: '(Designers Council Forum)'
Subject: RE: [DC] Test coupons

Hello,

I'm wondering if anyone can point me to some hard data or articles on the reduced reliability / failure of vias due to multiple reflow cycles.
I believe that after as little as 3 or 4 cycles that via reliability decreases quite dramatically, but can't remember where I actually got this from.
Repeated Z-axis expansion fatiguing the vias causing barrel cracking and separation is the mechanism I recall.

regards,

Phil Dutton C.I.D.+ 
Senior CAD Technician 
IPC Certified Interconnect Designer 
BAE Systems Australia 
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