1N4728A 3.3V 1W Zener Diode
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Prices updated: 13 Oct 2026
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About this product
The 1N4728A is a 1 W silicon Zener diode with a nominal Zener voltage of 3.3 V and ±5% tolerance. It suits low-voltage reference and clamping circuits for logic-level and sensor projects.
Specifications
- Zener voltage
- 3.3 V
- Power rating
- 1 W
- Tolerance
- ±5%
- Package
- DO-41 axial
Frequently asked questions
Can it protect a 3.3V microcontroller input?
It can clamp a line to about 3.3 V when reverse biased, but it is a slow-clamp component with limited power. For sensitive pins, a dedicated protection device or a series resistor is often preferred.
How do I test a Zener diode?
Use a multimeter in diode mode for a basic forward check. Verifying the actual Zener voltage requires a reverse-biased test with a series resistor and a known supply.
