Reply to "The case for fast-acting circuit protection"

JohnActonOGR Forum Member

gunrunnerjohn posted:
Be somewhat careful adding too many TVS diodes, especially on a DCS layout. The 1.5KE39CA 1500W commonly used TVS diode has around 1500pf of shunt capacitance. At 3mhz, that 1500pf has a capacitive reactance of around 35 ohms. Parallel enough of those and your DCS signal will be MIA.

John, might the capacitance of a TVS diode be indicative of whether or not it is bad when it dies in the shorted mode? Most VOMs measure capacitance today. Test and record the Capacitance. before installing. After an event which you suspect may have stressed your TVS check the capacitance again. My guess, the Capacitance will drop if the diode is shorted. j

11/2/197:09 PM

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