To: Tim Mascorella, [log in to unmask] Tim, The cathode end of a diode is marked by a square pad on the PCB. There are other ways of marking the cathode end of a diode on a PCB. One way we mark PCBs are by putting a line on the cathode end. The above information was found in a "Component Identification" Desk Reference Manual written by IPC. hope this helps, Rodney Shaver [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************