Hi All the RBx I/O that i want to protect for ESD have internal diodes already connected to Vss and Vdd. Is these two diodes in conjontion with a resistor in series can do a good job at protecting the 16f628 RBx I/O from ESD or if i will have to put my own two diodes ? Thanks in advance for your collaboration. Gilles Auger -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.