1N4740A 10V 1W Zener Diode
Part number: 1N4740ADiodes & Rectifiers
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Prices updated: 13 Oct 2026
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About this product
The 1N4740A is a 1 W silicon Zener diode with a nominal Zener voltage of 10 V and ±5% tolerance. It is commonly used for voltage reference, overvoltage clamping and simple regulation in low-power electronics projects.
Specifications
- Zener voltage
- 10 V
- Power rating
- 1 W
- Tolerance
- ±5%
- Package
- DO-41 axial
Frequently asked questions
What is the polarity of the 1N4740A?
The diode is marked with a band at the cathode end. For normal Zener operation it is reverse biased, so the banded cathode goes to the more positive point.
Do I need a resistor with this Zener diode?
Yes. A series resistor is required to limit the current; its value depends on the supply voltage and the load current.
