The hole size depends on the level (A,B,C) of the board.  For a level B
board add 28 mils to the minimum lead diameter and add 8 mils to max
lead diameter to get the hole size range.  

My regards,
Steve Smith
Project Engineer
Staco Energy Products Co.
"Your tailored power solutions provider"

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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Bavaro
Sent: Friday, September 16, 2011 11:59 AM
To: [log in to unmask]
Subject: [TN] Lead to hole clearances

I have a design with a T03 can in which the lead diameter is between
0.016" and 0.021".
My memory leads me to say the hole should be 0.017" larger than nominal
lead diameter but I don't remember where it is documented in the IPC
standards.
Where is the design guideline located for the proper hole diameter for
the board.  And does it matter if it is hand soldered or wave soldered.

Thanks in advance.

 

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