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 ================================ Phone (08) 8300 4400 (reception) (08) 8300 4481 (direct) Fax (08) 8349 7420 email [log in to unmask] Internet Page http//www.tenix.com ================================ -----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 ---------------------------------------------------------------------------- ----- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------