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. 700-2738
Mfr. Part No.UDZSTE-177.5B
BrandROHM
HK$1.964
Each (In a Pack of 10)
units
Single 7.5V Surface Mount 1 200 mW SOD-323F Voltage Regulator 2% 2 5mA 30Ω 500nA 1.7 x 1.25 x 0.7mm -
RS Stock No. 184-4137
Mfr. Part No.1N5245B
HK$0.207
Each (In a Bag of 5000)
units
Single 15V Through Hole 1 500 mW DO-35 General Purpose 5% 2 8.5mA 16 Ω @ 8.5 mA, 600 Ω @ 0.25 mA 100nA 1.91 (Dia.) x 4.56mm -
RS Stock No. 103-5131
Mfr. Part No.1N5351BG
HK$1.205
Each (In a Box of 1000)
units
Single 14V Through Hole 1 5 W Surmetic 40 Voltage Regulator 5% 2 100mA 75Ω 1µA 3.68 (Dia.) x 8.89mm -
RS Stock No. 186-8764
Mfr. Part No.1N5366BG
HK$1.428
Each (In a Box of 1000)
units
Single 39V Through Hole 1 5 W CASE 017AA Voltage Regulator ±5% 2 30mA 170Ω 500nA 3.68 (Dia.) x 8.89mm -
RS Stock No. 165-2350
Mfr. Part No.SML4740-E3/61
BrandVishay
HK$2.558
Each (On a Reel of 1800)
units
Single 10V Surface Mount 1 1 W SMA - 10% 2 25mA 10µA 4.6 x 2.9mm -
RS Stock No. 166-1238
Mfr. Part No.BZX79-C68,113
BrandNexperia
HK$0.185
Each (On a Reel of 5000)
units
Single 68V Through Hole 1 500 mW DO-35 Voltage Regulator 5% 2 2mA 240Ω 50nA 4.25 x 1.85 x 1.85mm -
RS Stock No. 811-5961
Mfr. Part No.1N5232B-TR
BrandVishay
HK$0.607
Each (In a Pack of 250)
units
Single 5.6V Through Hole 1 500 mW DO-35 General Purpose 5% 2 20mA 11Ω 5µA 1.7 (Dia.) x 3.9mm -
RS Stock No. 145-2219
Mfr. Part No.BZX85C6V2-TAP
BrandVishay
HK$0.538
Each (On a Reel of 5000)
units
Single 6.2V Through Hole 1 1.3 W DO-41 Voltage Regulator 6% 2 35mA 1µA 4.1 x 2.6 x 2.6mm -
RS Stock No. 166-1315
Mfr. Part No.BZX84-C6V8,215
BrandNexperia
HK$0.171
Each (On a Reel of 3000)
units
Single 6.8V Surface Mount 1 250 mW SOT-23 (TO-236AB) Voltage Regulator 5% 3 5mA 15Ω 2µA 3 x 1.4 x 1mm -
RS Stock No. 625-6495
Mfr. Part No.1N5374BRLG
HK$4.432
Each (In a Pack of 5)
units
Single 75V Through Hole 1 5 W DO-15 Voltage Regulator 5% 2 20mA 45Ω 500nA 8.89 x 3.68 x 3.68mm -
RS Stock No. 178-7582
Mfr. Part No.MMSZ5248BT1G
HK$0.30
Each (On a Reel of 3000)
units
Single 18V Surface Mount 1 500 mW SOD-123 Voltage Regulator 5% 2 7mA 21Ω 100nA 2.69 x 1.6 x 1.12mm -
RS Stock No. 805-0081
Mfr. Part No.1N4745ATR
HK$0.657
Each (In a Pack of 100)
units
Single 16V Through Hole 1 1 W DO-41 General Purpose 5% 2 15.5mA 16Ω 5µA 2.72 (Dia.) x 5.2mm -
RS Stock No. 625-6445
Mfr. Part No.1N5333BRLG
HK$4.494
Each (In a Pack of 5)
units
Single 3.3V Through Hole 1 5 W DO-15 Voltage Regulator 5% 2 380mA 300µA 8.89 x 3.68 x 3.68mm -
RS Stock No. 811-5967
Mfr. Part No.1N5231B-TR
BrandVishay
HK$0.625
Each (In a Pack of 250)
units
Single 5.1V Through Hole 1 500 mW DO-35 General Purpose 5% 2 20mA 17Ω 5µA 1.7 (Dia.) x 3.9mm -
RS Stock No. 159-6363
Mfr. Part No.1N5231B-TR
BrandVishay
HK$0.193
Each (On a Reel of 10000)
units
Single 5.1V Through Hole 1 500 mW DO-35 General Purpose 5% 2 20mA 17Ω 5µA 1.7 (Dia.) x 3.9mm -
RS Stock No. 708-7947
Mfr. Part No.BZX85C6V2-TAP
BrandVishay
HK$1.145
Each (In a Pack of 100)
units
Single 6.2V Through Hole 1 1.3 W DO-41 Voltage Regulator 6% 2 35mA 1µA 4.1 x 2.6 x 2.6mm -
RS Stock No. 169-0478
Mfr. Part No.UDZSTE-177.5B
BrandROHM
HK$0.432
Each (On a Reel of 3000)
units
Single 7.5V Surface Mount 1 200 mW SOD-323F Voltage Regulator 2% 2 5mA 30Ω 500nA 1.7 x 1.25 x 0.7mm -
RS Stock No. 103-3897
Mfr. Part No.1N5333BRLG
HK$1.155
Each (On a Reel of 4000)
units
Single 3.3V Through Hole 1 5 W DO-15 Voltage Regulator 5% 2 380mA 300µA 8.89 x 3.68 x 3.68mm -
RS Stock No. 170-3469
Mfr. Part No.1N5374BG
HK$1.421
Each (In a Bag of 1000)
units
Single 75V Through Hole 1 5 W Surmetic 40 Voltage Regulator 5% 2 20mA 620Ω 500nA 3.68 (Dia.) x 8.89mm -
RS Stock No. 121-9532
Mfr. Part No.BZT52C2V0-7-F
HK$0.265
Each (On a Reel of 3000)
units
Single 2V Surface Mount 1 500 mW SOD-123 Voltage Regulator 5% 2 5mA 100Ω 150µA 2.85 x 1.7 x 1.35mm -