Hi,

Personally, I think that hole size is a bit large but that depends upon the
assembly/soldering process.

As a basic 'rule-of-thumb' I use the follow formula:

Optimum finished hole sizes for through-hole leads: 
Auto-inserted components: 
Axial parts - max lead diameter + 0.016" 
Radial parts - max lead diameter + 0.019"
Dip parts - max effective lead size + 0.014" 
For components to be hand placed: 
All parts - max lead diam + 0.008"

Best regards,
 
Mario Irigoyen

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Tempea,
Ioan
Sent: Monday, August 28, 2006 8:19 AM
To: [log in to unmask]
Subject: [DC] Hole diameter specification

Hi,

I have a TH cap that has 0.064" diameter pins and 0.089" diameter holes. Are
the holes properly designed?

I have skimmed IPC-2221 and IPC-D-279, but cannot find any formula for
calculating the diameter of the hole from the pin diameter. Where can I find
such formula?

Thanks,

Ioan

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