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Subject:	Re: IPC through-hole LEAD diameter to HOLE diameter
From:	James Jackson <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Wed, 7 Jan 2009 14:40:56 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (63 lines)

Well, if IPC-2222 is still current...

Section 9.2.2 Plated-Through Holes

also Table 9-3

According to Table 9-3, the numbers you mentioned fit into the 'minimum hole 
to maximum lead diameter' columns... with 0.25mm = Level A, and 0.15mm = 
Level C.

IF... I am reading it correctly.

I hope this helps...

Regards,

James Jackson 
Oztronics



Quoting Jack Olson <[log in to unmask]>:

> Greetings,
> 
> I was just reviewing the Working Draft for the new IPC-7251 (Land Pattern
> Standard)
> http://www.ipc.org/committeedetail.aspx?Committee=1-13
> and noticed the recommendation for holes being 0.15-0.25mm over max lead
> diameter.
> (depending on complexity level)
> 
> Has this ever been addressed before?
> If so, does this match previous IPC recommendations?
> 
> Jack (aka "the new guy")
> 
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