1N5338B Zener Diode 5.1V 5W
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Prices updated: 13 Oct 2026
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About this product
The 1N5338B is a 5 W silicon Zener diode with a nominal Zener voltage of 5.1 V. It is used for voltage reference, regulation and overvoltage clamping in low-voltage power circuits that need more power dissipation than a 1 W Zener can handle.
Specifications
- Zener voltage (Vz)
- 5.1 V
- Power rating
- 5 W
- Tolerance
- ±5% (B suffix)
- Package
- Axial (DO-201AD)
- Type
- Zener diode
Frequently asked questions
How do I wire it as a simple voltage reference?
Connect it in reverse bias: the cathode goes to the positive supply through a series resistor, and the anode goes to ground. Size the resistor so the diode current keeps the dissipation within the 5 W rating (P = Vz × Iz).
What does the B suffix in 1N5338B mean?
The B suffix denotes the tighter ±5% voltage tolerance in this 1N53xxB series, compared with the wider tolerance of the unsuffixed or A-suffixed variants.
