Zener Diodes

Zener diodes are a type of semiconductor device that has different characteristics to 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 a 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. 166-0304
Mfr. Part No.BZX79-C8V2,113
BrandNexperia
£0.014
Each (On a Reel of 10000)
Units
Single 8.2V Through Hole 1 500 mW DO-35 Voltage Regulator 5% 2 5mA 15Ω 700nA 4.25 x 1.85 x 1.85mm -
RS Stock No. 545-2967
Mfr. Part No.MMSZ5222BT1G
£0.101
Each (In a Pack of 20)
Units
Single 2.5V Surface Mount 1 500 mW SOD-123 Voltage Regulator 5% 2 20mA 30Ω 100µA 2.69 x 1.6 x 1.12mm -
RS Stock No. 177-7446
Mfr. Part No.TZX4V7A-TR
BrandVishay
£0.012
Each (On a Reel of 10000)
Units
Single 4.5V Through Hole 1 500 mW DO-35 Voltage Regulator 2% 2 5mA 100Ω 5µA 1.7 (Dia.) x 3.9mm -
RS Stock No. 818-5086
Mfr. Part No.TZX4V7A-TR
BrandVishay
£0.013
Each (In a Pack of 200)
Units
Single 4.5V Through Hole 1 500 mW DO-35 Voltage Regulator 2% 2 5mA 100Ω 5µA 1.7 (Dia.) x 3.9mm -
RS Stock No. 145-3099
Mfr. Part No.MMSZ5222BT1G
£0.023
Each (On a Reel of 3000)
Units
Single 2.5V Surface Mount 1 500 mW SOD-123 Voltage Regulator 5% 2 20mA 30Ω 100µA 2.69 x 1.6 x 1.12mm -
RS Stock No. 169-8526
Mfr. Part No.BZX85C15
£0.035
Each (In a Bag of 1000)
Units
Single 15V Through Hole 1 1 W DO-41 - 5% 2 15mA 15Ω 500nA 5.21 x 2.72 x 2.72mm -
RS Stock No. 145-2285
Mfr. Part No.TZX5V1B-TR
BrandVishay
£0.019
Each (On a Reel of 10000)
Units
Single 5V Through Hole 1 500 mW DO-35 Voltage Regulator 2% 2 5mA 100Ω 5µA 1.7 (Dia.) x 3.9mm -
RS Stock No. 436-8186
Mfr. Part No.BZX84-C15,215
BrandNexperia
£0.088
Each (In a Pack of 50)
Units
Single 15V Surface Mount 1 250 mW SOT-23 Voltage Regulator 5% 3 5mA 30Ω 50nA 3 x 1.4 x 1mm -
RS Stock No. 818-5099
Mfr. Part No.TZX5V1B-TR
BrandVishay
£0.054
Each (In a Pack of 200)
Units
Single 5V Through Hole 1 500 mW DO-35 Voltage Regulator 2% 2 5mA 100Ω 5µA 1.7 (Dia.) x 3.9mm -
RS Stock No. 178-7145
Mfr. Part No.BZX84-C15,215
BrandNexperia
£0.014
Each (On a Reel of 3000)
Units
Single 15V Surface Mount 1 250 mW SOT-23 Voltage Regulator 5% 3 5mA 30Ω 50nA 3 x 1.4 x 1mm -
RS Stock No. 464-031
Mfr. Part No.1N5355BG
£0.252
Each (In a Pack of 10)
Units
Single 18V Through Hole 1 5 W DO-15 Voltage Regulator 5% 2 65mA 2.5Ω 500nA 8.89 x 3.68 x 3.68mm -
RS Stock No. 813-3912
Mfr. Part No.ZPY20-TR
BrandVishay
£0.097
Each (In a Pack of 100)
Units
Single 20V Through Hole 1 1.3 W DO-41 General Purpose 5% 2 25mA 12Ω 500nA 2.6 (Dia.) x 5.2mm -
RS Stock No. 102-2267
Mfr. Part No.1N5355BG
£0.097
Each (In a Box of 1000)
Units
Single 18V Through Hole 1 5 W DO-15 Voltage Regulator 5% 2 65mA 2.5Ω 500nA 8.89 x 3.68 x 3.68mm -
RS Stock No. 145-2259
Mfr. Part No.ZPY20-TR
BrandVishay
£0.043
Each (On a Reel of 5000)
Units
Single 20V Through Hole 1 1.3 W DO-41 General Purpose 5% 2 25mA 12Ω 500nA 2.6 (Dia.) x 5.2mm -
RS Stock No. 186-8749
Mfr. Part No.1N5335BG
£0.107
Each (In a Box of 1000)
Units
Single 3.9V Through Hole 1 5 W CASE 017AA Voltage Regulator ±5% 2 320mA 500Ω 50µA 3.68 (Dia. x 8.89mm -
RS Stock No. 166-1330
Mfr. Part No.BZX384-C12,115
BrandNexperia
£0.02
Each (On a Reel of 3000)
Units
Single 12V Surface Mount 1 300 mW UMD Voltage Regulator 5% 2 5mA 25Ω 100nA 1.8 x 1.35 x 1.05mm -
RS Stock No. 774-3284
Mfr. Part No.1N5346BG
£0.252
Each (In a Pack of 10)
Units
Single 9.1V Through Hole 1 5 W Surmetic 40 Voltage Regulator 5% 2 150mA 150Ω 7.5µA 3.68 (Dia.) x 8.89mm -
RS Stock No. 186-9299
Mfr. Part No.1N5335BG
£0.276
Each (In a Pack of 25)
Units
Single 3.9V Through Hole 1 5 W CASE 017AA Voltage Regulator ±5% 2 320mA 500Ω 50µA 3.68 (Dia.) x 8.89mm -
RS Stock No. 508-056
Mfr. Part No.BZX384-C12,115
BrandNexperia
£0.055
Each (In a Pack of 200)
Units
Single 12V Surface Mount 1 300 mW UMD Voltage Regulator 5% 2 5mA 25Ω 100nA 1.8 x 1.35 x 1.05mm -
RS Stock No. 654-7533
Mfr. Part No.1N5335BRLG
£0.344
Each (In a Pack of 5)
Units
Single 3.9V Through Hole 1 5 W DO-15 Voltage Regulator 5% 2 320mA 50µA 8.89 x 3.68 x 3.68mm -
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