Hi Denise,
P is not currently in 2221. DSCC added it directly into their board specs. If memory serves, their "customers" had trouble with the uncertainty from the thinner pulls of the N. It can be done, of course, but you need the right equipment. And the peel strength is generally not linear with respect to width, even though that's how we normalize it.
Remember that there is no peel strength testing in the 601X series.
Chris
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Denise Chevalier
Sent: Friday, February 26, 2010 2:03 PM
To: [log in to unmask]
Subject: Re: [IPC-600-6012] 1-10C (Coupon Design) liaison memo
Is the P-coupon defined in 2221 currently?
Agree with going towards consolidating these coupons to the P. Believe
31032 specifies the P coupon for peel strength the C and the N do not
meet the TM-650 requirements.
Denise
-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Chris
Mahanna
Sent: Friday, February 26, 2010 1:48 PM
To: [log in to unmask]
Subject: [IPC-600-6012] 1-10C (Coupon Design) liaison memo
Good Friday afternoon,
As most of you are aware, a couple years ago D-33/7-31a ask 1-10C to
focus on the traditional 2221 conformance coupons.
Today you will not hear a sorry plead from me to transition to the
wonderful A/B-R.
We are moving on to the "C", "N" and "P".
First, a little background: In Phoenix, I presented a plan to
"clean-up" the 2221 coupon design list. Lofty goals were presented-
e.g. better coupons, harmonization, standardization.
1-10C plans to present a complete proposed set to 2221 in Vegas.
Please don't get too excited, the "old" coupons will still be defined,
and unless a performance body decides otherwise, they will still be
acceptable.
For what I've termed "the short list", we are currently suggesting that
the C, N, and P be collapsed into the P.
I know that some people use the C for plating adhesion rather than
actual product, and I know that 4101 will require the use of 0.79mm
strips (actually not on the N either) for condition C. Some people
surely have the N in their 31032 program.
But, by and large, the only mandate for an elongated trace is the
military 3.15mm sample- the P coupon. We are suggesting that it is a
(2221) "short-list" entry conditioned on foil-lam builds only.
We are currently seeking feedback pro or con.
Thanks and have a great weekend.
Chris
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