Diode Symbols

Symbol Component Name Description
Diode Diode allows current flow in one direction only - left (anode) to right (cathode).
Zener Diode Allows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage
Schottky Diode Schottky diode is a diode with low voltage drop
Varactor / Varicap Diode Variable capacitance diode
Tunnel Diode Tunnel Diode
Light Emitting Diode (LED) LED emits light when current flows through
Photo-diode Photo-diode allows current flow when exposed to light