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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. You can find out more in our Zener diodes guide.

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.

5554 Products showing for Zener Diodes

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In Stock
onsemi 1, 4.7 V Zener Diode, Single 500 mW 5 % Surface 2-Pin SOD-123
  • RS Stock No. 791-6189
  • Mfr. Part No. MMSZ4688T1G
Subtotal (1 pack of 100 units)
£4.20(exc. VAT)
£0.042/unit
Limited stock
onsemi 1, 3.9 V Zener Diode, Single 550 mW 5 % Surface 2-Pin DO-214AA
  • RS Stock No. 545-0539
  • Mfr. Part No. 1SMB5915BT3G
Subtotal (1 pack of 10 units)
£1.13(exc. VAT)
£0.113/unit
In Stock
Nexperia 1, 5.1 V Zener Diode, Single 500 mW 5 % Through Hole 2-Pin SOD-27
  • RS Stock No. 544-3597
  • Mfr. Part No. BZX79-C5V1,113
Subtotal (1 pack of 20 units)
£3.72(exc. VAT)
£0.186/unit
In Stock
onsemi 1, 18 V Zener Diode, Single 1 W 5 % Through Hole 2-Pin DO-41
  • RS Stock No. 917-5443
  • Mfr. Part No. 1N4746A
Subtotal (1 pack of 100 units)
£3.80(exc. VAT)
£0.038/unit
In Stock
onsemi 1, 12 V Zener Diode, Single 5 W 5 % Through Hole 2-Pin DO-15
  • RS Stock No. 625-6568
  • Mfr. Part No. 1N5349BRLG
Subtotal (1 pack of 10 units)
£1.95(exc. VAT)
£0.195/unit
In Stock
onsemi 1, 9.1 V Zener Diode, Single 5 W 5 % Through Hole 2-Pin DO-15
  • RS Stock No. 774-3284
  • Mfr. Part No. 1N5346BG
Subtotal (1 pack of 10 units)
£3.08(exc. VAT)
£0.308/unit
In Stock
onsemi 1, 8.2 V Zener Diode, Single 5 W 5 % Through Hole 2-Pin DO-15
  • RS Stock No. 654-7561P
  • Mfr. Part No. 1N5344BRLG
Subtotal 5 units (supplied on a continuous strip)
£1.90(exc. VAT)
£0.38/unit
In Stock
onsemi 1, 5.1 V Zener Diode, Single 500 mW 5 % Surface 2-Pin SOD-123
  • RS Stock No. 687-8269P
  • Mfr. Part No. MMSZ4689T1G
Subtotal 25 units (supplied on a continuous strip)
£0.35(exc. VAT)
£0.014/unit
In Stock
onsemi 1, 15 V Zener Diode, Single 1 W 5 % Through Hole 2-Pin DO-41
  • RS Stock No. 670-8867
  • Mfr. Part No. BZX85C15
Subtotal (1 pack of 20 units)
£2.66(exc. VAT)
£0.133/unit
In Stock
Nexperia 1, 6.8 V Zener Diode, Single 500 mW 5 % Through Hole 2-Pin SOD-27
  • RS Stock No. 544-3626
  • Mfr. Part No. BZX79-C6V8,113
Subtotal (1 pack of 20 units)
£3.72(exc. VAT)
£0.186/unit
In Stock
Nexperia 1, 6.2 V Zener Diode, Single 500 mW 2 % Through Hole 2-Pin SOD-27
  • RS Stock No. 509-093
  • Mfr. Part No. BZX79-B6V2,113
Subtotal (1 pack of 100 units)
£11.40(exc. VAT)
£0.114/unit
In Stock
Nexperia 1, 16 V Zener Diode, Single 500 mW 2 % Through Hole 2-Pin SOD-27
  • RS Stock No. 136-4882
  • Mfr. Part No. BZX79-C16,113
Subtotal (1 pack of 100 units)
£6.60(exc. VAT)
£0.066/unit
In Stock
onsemi 1, 5.1 V Zener Diode, Single 5 W 5 % Through Hole 2-Pin DO-15
  • RS Stock No. 625-6451
  • Mfr. Part No. 1N5338BRLG
Subtotal (1 pack of 5 units)
£2.19(exc. VAT)
£0.438/unit
Last RS stock
onsemi 1, 15 V Zener Diode, Single 225 mW 5 % Surface 3-Pin SOT-23
  • RS Stock No. 781-5496
  • Mfr. Part No. SZMMBZ5245BLT1G
Subtotal (1 tape of 50 units)
£1.35(exc. VAT)
£0.027/unit
In Stock
onsemi 1, 4.3 V Zener Diode, Single 500 mW 5 % Surface 2-Pin SOD-123
  • RS Stock No. 545-3027
  • Mfr. Part No. MMSZ5229BT1G
Subtotal (1 pack of 20 units)
£1.10(exc. VAT)
£0.055/unit
In Stock
Vishay 1, 5.6 V Zener Diode, Single 1.3 W 7 % Through Hole 2-Pin DO-41
  • RS Stock No. 699-7846
  • Mfr. Part No. BZX85C5V6-TAP
Subtotal (1 pack of 100 units)
£4.50(exc. VAT)
£0.045/unit
In Stock
onsemi 1, 15 V Zener Diode, Single 500 mW 5 % Surface 2-Pin SOD-123
  • RS Stock No. 791-6191
  • Mfr. Part No. MMSZ4702T1G
Subtotal (1 pack of 100 units)
£2.50(exc. VAT)
£0.025/unit
In Stock
onsemi 1, 3.3 V Zener Diode, Single 500 mW 5 % Surface 2-Pin SOD-123
  • RS Stock No. 625-5795
  • Mfr. Part No. MMSZ3V3T1G
Subtotal (1 pack of 50 units)
£1.80(exc. VAT)
£0.036/unit
In Stock
onsemi 1, 24 V Zener Diode, Single 5 W 5 % Through Hole 2-Pin DO-15
  • RS Stock No. 654-7640
  • Mfr. Part No. 1N5359BRLG
Subtotal (1 pack of 5 units)
£2.03(exc. VAT)
£0.406/unit
Last RS stock
Vishay 1, 51 V Zener Diode, Single 1 W 5 % Surface 2-Pin SMA (DO-214AC)
  • RS Stock No. 233-0996
  • Mfr. Part No. SML4757AHE3_A/H
Subtotal (1 pack of 25 units)
£8.00(exc. VAT)
£0.32/unit
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