PIN Diodes


Staff member
I got some solid state RF switching modules from a recent auction and was explaining how PIN diodes the PIN refers to the semiconductor layers, but I couldn't remember what the "I" stood for. So I looked it up, it stands for "intrinsic" or undoped, so you have a P-type layer, an Intrinsic Layer and an N-type layer.

Alan W2AEW has a good video on how the undoped layer allows RF to flow through a PIN diode when biased on.