Russell McMahon wrote: >> Unfortunately I am again dealing with something I can only do limited >> changes too. I have 126 of this boards installed per PSU and I have 6 >> PSUs. The aim is to replace the chip by another that is pin compatible. >> Or if you only need to sink, have a daughter board with the IC and a BS170 or similar N-Fet. How many gates in package used? If only one, and you only sink you could put a BS170 or similar direct into PCB. Unlike NPN transistor the gate needs no resistor and is "TTL" compatible. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist