>Query: How to protect uPower 5V rail at u leakage currents >for the protector. > > >Starters for 10 points: You left out "use current limited power supply during development, with limit set within suitable level for normal operation". In the OPs case it would seem a supply with fold back current limit would be wise ... -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist