BryanG
Member
Having a thick headed morning. I am looking at protecting some 24V d.c. circuits with TVS diodes and am getting myself confused. For a 24V d.c. circuit I think I need a Stand Off voltage of 22V with a Breakdown voltage of 24.4V. That would seem to give a close protection. Otherwise maybe a Stand Off voltage of 27V with a breakdown of 30V, but that brings me close to the maximum allowable voltage for various HMIs and devices.
Then I am getting really confused with UniDirectional and BiDirectional. Normally with a diode you get high resistance in one direction and low resistance in the other. So does a UniDirectional breakdown at a voltage in one direction but always have low resistance in the other? And what does a BiDirectional do?
Then I am getting really confused with UniDirectional and BiDirectional. Normally with a diode you get high resistance in one direction and low resistance in the other. So does a UniDirectional breakdown at a voltage in one direction but always have low resistance in the other? And what does a BiDirectional do?