Thanks James. I'll run the numbers.
-----Original Message-----
From: James Head [mailto:[log in to unmask]]
Sent: Monday, December 19, 2011 10:40 AM
To: TechNet E-Mail Forum; Phil Nutting
Subject: RE: PTH hole size "standards"
For a rigid board, IPC-2222 section 9 gives you this.
For level A:
maximum hole to minimum lead diameter, no greater than 0.7 mm over minimum lead diameter minimum hole to maximum lead diameter, no less than 0.25 mm over maximum lead diameter
For level B:
maximum hole to minimum lead diameter, no greater than 0.7 mm over minimum lead diameter minimum hole to maximum lead diameter, no less than 0.20 mm over maximum lead diameter
For level C:
maximum hole to minimum lead diameter, no greater than 0.6 mm over minimum lead diameter minimum hole to maximum lead diameter, no less than 0.15 mm over maximum lead diameter
For square lead you take the diagonal as the lead diameter.
Regards,
James
James Head BEng CID MIIE MIET
Senior PCB CAD Engineer
Crowcon Detection Instruments Limited
2 Blacklands Way
Abingdon Business Park
ABINGDON
OX14 1DY
Telephone: 01235 557700 extension 289
Fax: 07092024504
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