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Electronic Knowledge | Diodes

一、Definition

Diodes only allow current to flow in one direction, and they're always polarized. A diode has two terminals. The positive side is called the anode, and the negative one is called the cathode.

 

二、Function

Current through a diode can only flow from the anode to the cathode, which would explain why it's important for a diode to be connected in the correct direction. Physically, every diode should have some sort of indication for either the anode or cathode pin. Usually the diode will have a line near the cathode pin, which matches the vertical line in the diode circuit symbol.

 

三、How to order?

(1) Maximum forward voltage vf(max) (at the specified current and temperature)?
(2) Maximum forward current if(max) (at the specified temperature)?
(3) Maximum reverse current Ir(max) (at the specified temperature)?
(4) Reverse voltage rating (PIV) or (PRV) or breakdown voltage V(BR) (at the specified temperature)?
(5) Maximum trr?
(6) Packaging?
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