A Zener diode is a special kind of diode which allows current to flow in the forward direction like a regular diode, but also allows it to flow in the reverse direction when the voltage is above a certain value. This is known as the “breakdown voltage”.
Zener diodes are often used to stabilize and clip circuits.
The 1N4728 is a 3.3V Zener Diode, meaning it has a breakdown voltage of 3.3V.
DO-41 (glass), Axial
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