Hello,

Going by the tables and formula in IPC-2222, I would say that the minimum
pad diameter should be

1.2 + 2x(0.15)+ 0.4 = 1.9mm

(assuming that the hole size is maximum lead diameter + (0.25mm to 0.7mm))

I would go a little larger for this sort of application to give more support
for maintenance (maybe 2.5mm)

regards,

Phil.


Phil Dutton C.I.D.
Senior CAD Technician
IPC Certified Interconnect Designer

Tenix Defence Pty Ltd
Electronic Systems Division
Second Avenue, Technology Park,
Mawson Lakes.  SOUTH AUSTRALIA  5095

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Phone   (08) 8300 4400 (reception)
        (08) 8300 4481 (direct)
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Internet Page   http//www.tenix.com
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-----Original Message-----
From: Ahmed El-Sanhoury [mailto:[log in to unmask]]
Sent: Monday, 20 August 2001 15:54
To: [log in to unmask]
Subject: [DC] reliable through hole pad diameter


All
When we have a passive component used in consumer electronics application
(TV application single layer),which has a hole diameter equals to 1.2mm,what
is the proper value of pad diameter to satisfy
maintenance and reliability consideration.

Thanks
A.sunhoury

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