Zener Diodes

Zener diodes are a type of semiconductor device that has different characteristics from a normal diode. Zener diodes allow current to flow from its anode to its cathode in either a forward or reverse direction, but only when exposed to enough voltage.

How does a Zener diode work?

Zener diodes are designed to change the direction of the current flow once the voltage reaches a specific, defined voltage level. This also means that Zener diodes can operate continuously in a breakdown mode. The voltage level that changes the direction of flow is called Zener Voltage or Breakdown Voltage. It could be defined for specific diodes anywhere from 1.8 to 200 V.

Types of Zener diodes

Zener diodes are offered in an array of different configurations such as different levels of power dissipation, mount types, and different configurations.

There are also different types of Zener diodes such as:

  • Avalanche
  • Bi-Directional
  • ESD Protection
  • General Purpose
  • Ultra-small

Typical applications of Zener diodes?

Zener diodes are used in all kinds of electronic equipment and are used to protect circuits from overvoltage and electrostatic discharge or for switching applications. They are one of the basic building blocks of electronic circuits. Zener diodes work reliably in the breakdown region, unlike normal diodes which would overheat. They are the most common and handiest solutions to a number of needs in a circuit design.


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Description Price Diode Configuration Nominal Zener Voltage Mounting Type Number of Elements per Chip Maximum Power Dissipation Package Type Zener Type Zener Voltage Tolerance Pin Count Test Current Maximum Zener Impedance Maximum Reverse Leakage Current Dimensions Automotive Standard
RS Stock No. 188-220
Mfr. Part No.RD7.5S-A
HK$0.67
Each (In a Pack of 25)
units
Single 7.5V Surface Mount 1 200 mW Super MiniMold General Purpose - 2 5mA 30Ω 2µA 1.7 x 1.25 x 0.9mm -
RS Stock No. 188-062
Mfr. Part No.RD11S-A
HK$0.662
Each (In a Pack of 25)
units
Single 11V Surface Mount 1 200 mW Super MiniMold General Purpose - 2 5mA 30Ω 2µA 1.7 x 1.25 x 0.9mm -
RS Stock No. 188-078
Mfr. Part No.RD12S-A
HK$0.698
Each (In a Pack of 25)
units
Single 12V Surface Mount 1 200 mW Super MiniMold General Purpose - 2 5mA 35Ω 2µA 1.7 x 1.25 x 0.9mm -
RS Stock No. 188-135
Mfr. Part No.RD3.0S-A
HK$0.698
Each (In a Pack of 25)
units
Single 3V Surface Mount 1 200 mW Super MiniMold General Purpose - 2 5mA 120Ω 50µA 1.7 x 1.25 x 0.9mm -
RS Stock No. 188-056
Mfr. Part No.RD10S-A
HK$0.698
Each (In a Pack of 25)
units
Single 10V Surface Mount 1 200 mW Super MiniMold General Purpose - 2 5mA 30Ω 2µA 1.7 x 1.25 x 0.9mm -