Yes, we used to build our coupons like that until DSCC slapped our hands 
for the reasons mentioned. The IPC-2221 Coupon sub-committee is looking 
into the feasibility of creating this coupon in this fashion now. Chris, 
are you out there?
Tom



Jose A Rios <[log in to unmask]> 
Sent by: IPC-600-6012 <[log in to unmask]>
05/14/2010 03:24 PM
Please respond to
"(Combined Forum of D-33a and 7-31a Subcommittees)" <[log in to unmask]>


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Subject
[IPC-600-6012] E coupon configuration






We noted that our coupon generator flips the direction of the Y circuit 
pattern on the 10th layer to control the length of the E coupon, as shown 
in the 1st screenshot below.


Arguably it may compromise the integrity of the test between layers 10 and 

11, since there is basically no overlapping circuits. Does a re-design 
like the one the 2nd screenshot below violate any coupon design reqts?? 
The 10th plane use wires in both directions so that it is effective in 
testing both against the 9th and 11th planes like this. (Blue is the 10th 
plane, Yellow is the 11th plane, purple-ish is where there is data on both 

planes) 


Has anyone else run into this situation??

Joey Rios
PWB & Process Quality Eng'r
Endicott Interconnect Technologies
1093 Clark St.
Endicott, NY 13760
Office: 607-755-5896

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