In a message dated 7/7/99, Susan Beard writes: << Anyone know of any connectors with 0.1" spacings that survive a 2000 volt rms hipot requirement? >>
Susan: Don't forget that for most connectors, the minimum spacing actually occurs on the printed circuit board, at the land areas around the pins. For a through-hole connector that has .100" pin spacings and .060" round pads, the spacing on the board will be .040". Several times I have seen people fail to take this into account. For through-hole pins, you can increase the separation by using an oval pad. Surface mount connectors often allow greater spacing for the same pin pitch. Another way to provide the required separation is to use a connector that has a smaller pitch, but allocate one or more "dead" pins (not connected to anything) between the pins you are trying to separate. In this case, the effective separation will be the total of all the smaller separations between pins. Sometimes this approach allows you to use a connector that is otherwise more desirable than one selected specifically for its pin separation. In practice, a .040" spacing might pass your 2000 VRMS test, but I would recommend a minimum of .050". Anything above this amount would increase your margin of safety. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 (voice) 781-721-0582 (fax) --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
