IPC J-STD-001D page 17, last paragraph of 6.1.3 - connector leads are
exempt from the maximum length requirement provided that they do not
violate minimum electrical spacing at the next higher assembly level.

Gary Camac


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Tuesday, November 13, 2007 7:49 AM
To: [log in to unmask]
Subject: [TN] TH pin clipping and class 3

Dear Technos,

 

I am having a class 3 board, with hollow pin TH connectors. To get them
within the 0.059in spec we need to trim the pins, but being hollow they
deform, cracking the solder, hence tons of touch-up.

 

I have 2 questions:

*         What is the rationale behind requesting shorter pin
protrusions for class 3 vs. class 2

*         My wishful thinking lights a pale souvenir in my mind telling
that there is a MIL spec that forbids pin clipping. Am I right, or is it
only wishful thinking?

 

Thanks,

 

Ioan


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