Diode symbol
Also called Rectifier diode
A diode lets current flow one way only, from anode to cathode. The triangle points in the direction of conventional current; the bar is the cathode.
What the diode symbol means
A diode lets current flow one way only, from anode to cathode. The triangle points in the direction of conventional current; the bar is the cathode.
ANSI and IEC symbols
Where you see it
Rectifiers, reverse polarity protection, freewheeling diodes across relay coils, and signal steering.
What is written next to it
On a schematic, the diode usually carries its designator and part number, such as D1 1N4007.
Related symbols
Frequently asked questions
What does the diode symbol look like?
On ANSI drawings: A triangle pointing at a bar. In IEC 60617: The same triangle and bar.
Is the diode symbol the same in IEC and ANSI?
Yes, it is drawn the same way in most legends.
Where is a diode used?
Rectifiers, reverse polarity protection, freewheeling diodes across relay coils, and signal steering.
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