What I found a few years back when I researched the requirements for ICT
was that SMTA was the actual org that established standards for ICT,
they have a document TP-101C (testability guidelines) that spells out
the requirements for test, you can also get this info from Agilent or
Teradyne web sites, since they are the people that had the major hand in
developing it

You are correct on the tolerance

3 tooling holes are preferred to two and the hole doesn't have to be
.125

IPC-782 has probably the most extensive discussion about ICT, no mention
of size or tolerance of holes though, you should not follow 782 IMO, the
information there is not current

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Fred
Dark
Sent: Wednesday, February 04, 2004 1:21 PM
To: [log in to unmask]
Subject: [DC] Tolerances


Can some one tell me the IPC standard for the tolerance on a .125dia
tooling hole used for ATE\ICT testing that is located in a board in
diagonal corners dimensioned from the 0,0 datum.... I'm under the
impression that it is +.002/-.000... Would I be correct, if so where
could I find this in writing... I have IPC-2221, but I can't find it in
there no where.... Please help...

Regard's, Fred Dark Jr.

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