Hi, In my application there is a chance that the user gives more than the maximum 5.5 volt to the PIC (10F200). It is very tiny app, so I do not want to put voltage regulator if possible. The question is what do you think if I just put a 4.7 zener in between the Vdd and Vss? Thanks Tamas -- unPIC -- The PIC Disassembler http://unpic.sourceforge.net -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist