Zener Diodes

A Zener diode is a type of semiconductor diode that is different to a normal diode as it allows current to flow from its anode to its cathode in either a forward or reverse direction, but only when exposed to enough voltage. Zener diodes have been designed to work reliably in the breakdown region, unlike normal diodes which would overheat. They are the most common and the handiest solutions to a number of needs in a circuit design.

Zener diodes are designed to change the direction of 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 that change 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.

Key attributes of a Zener diode are:

• Device configuration including a dual or common anode
• Type of Zener, including avalanche or voltage regulator
• Voltage tolerance
• Voltage drift with temperature
• Impedance (max)

What is a typical application 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.

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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 Length Width
RS Stock No. 145-2333
Mfr. Part No.MMBZ4620-E3-08
BrandVishay
SGD0.063
Each (On a Reel of 3000)
units
Single 3.3V Surface Mount 1 350 mW SOT-23 General Purpose ±5% 3 0.25mA 1650Ω 7.5µA 3.1mm 1.43mm
RS Stock No. 751-4559
Mfr. Part No.MMSZ5225BS-7-F
SGD0.149
Each (In a Pack of 100)
units
Single 3V Surface Mount 1 200 mW SOD-323 Voltage Regulator 5% 2 20mA 30Ω 50µA 1.8mm 1.4mm
RS Stock No. 169-8515
Mfr. Part No.1N5239BTR
SGD0.035
Each (On a Reel of 5000)
units
Single 9.1V Through Hole 1 500 mW DO-35 General Purpose 5% 2 20mA 10Ω 3µA 4.56mm -
RS Stock No. 805-0980
Mfr. Part No.1N4731ATR
SGD0.122
Each (In a Pack of 200)
units
Single 4.3V Through Hole 1 1 W DO-41 General Purpose 5% 2 58mA 10µA 5.2mm -
RS Stock No. 165-7081
Mfr. Part No.1N5245B-TR
BrandVishay
SGD0.035
Each (On a Reel of 10000)
units
Single 15V Through Hole 1 500 mW DO-35 General Purpose 5% 2 8.5mA 16Ω 100nA 3.9mm -
RS Stock No. 177-7434
Mfr. Part No.TZX18C-TR
BrandVishay
SGD0.039
Each (On a Reel of 10000)
units
Single 18.5V Through Hole 1 500 mW DO-35 Voltage Regulator 2% 2 5mA 55Ω 1µA 3.9mm -
RS Stock No. 186-9347
Mfr. Part No.MM3Z4V7C
SGD0.237
Each (In a Pack of 50)
units
Single 4.7V Surface Mount 1 200 mW SOD-323F Voltage Regulator ±5% 2 5mA 470 Ω @ 1 mA, 75 Ω @ 5 mA 2.7µA 1.7mm 1.3mm
RS Stock No. 133-3188
Mfr. Part No.EDZVT2R9.1B
BrandROHM
SGD0.127
Each (In a Pack of 200)
units
Single 9.1V Surface Mount 1 150 mW SOD-523 Voltage Regulator - 2 - 60Ω 500nA 1.25mm 0.85mm
New
RS Stock No. 190-6788
Mfr. Part No.SMM4F28A-TR
SGD0.187
Each (On a Reel of 12000)
units
Single 28V Surface Mount 1 400 W StmiteFLAT - - 2 - - 200nA 3.1mm 2.05mm
RS Stock No. 163-1959
Mfr. Part No.1SMA5935BT3G
SGD0.134
Each (On a Reel of 5000)
units
Single 27V Surface Mount 1 1.5 W SMA Voltage Regulator 5% 2 13.9mA 23Ω 500nA 4.57mm 2.92mm
RS Stock No. 822-9022
Mfr. Part No.BZX84C24-7-F
SGD0.096
Each (In a Pack of 200)
units
Single 24V Surface Mount 1 350 mW SOT-23 General Purpose 6% 3 5mA 70Ω 100nA 3mm 1.4mm
RS Stock No. 165-6323
Mfr. Part No.BZM55C8V2-TR
BrandVishay
SGD0.056
Each (On a Reel of 2500)
units
Single 8.2V Surface Mount 1 500 mW MicroMELF Voltage Regulator 6% 2 5mA <7Ω <2µA 2mm 1.2mm
RS Stock No. 145-5253
Mfr. Part No.SZMMSZ5243BT1G
SGD0.105
Each (On a Reel of 3000)
units
Single 13V Surface Mount 1 500 mW SOD-123 Voltage Regulator 5% 2 9.5mA 13Ω 500nA 2.84mm 1.8mm
RS Stock No. 190-6780
Mfr. Part No.SM6T75CAY
SGD0.397
Each (On a Reel of 2500)
units
Single 64.1V Surface Mount 1 600 W DO-214AA (SMB) Bi-Directional - 2 - - 200nA 3.95mm 4.6mm
RS Stock No. 145-3445
Mfr. Part No.SZMMSZ4V3T1G
SGD0.075
Each (On a Reel of 3000)
units
Single 4.3V Surface Mount 1 500 mW SOD-123 Voltage Regulator 5% 2 5mA 90Ω 3µA 2.84mm 1.8mm
RS Stock No. 800-8838
Mfr. Part No.1N5931BRLG
SGD0.469
Each (In a Pack of 50)
units
Single 18V Through Hole 1 3 W Case 59-10 Voltage Regulator 5% 2 20.8mA 12 Ω, 650 Ω 250nA - -
RS Stock No. 145-2631
Mfr. Part No.BZM55C12-TR
BrandVishay
SGD0.056
Each (On a Reel of 2500)
units
Single 12V Surface Mount 1 500 mW MicroMELF Voltage Regulator 5% 2 5mA 20Ω 100nA 2mm 1.2mm
RS Stock No. 699-7783
Mfr. Part No.BZX55C12-TAP
BrandVishay
SGD0.111
Each (In a Pack of 250)
units
Single 12V Through Hole 1 500 mW DO-35 Voltage Regulator 5% 2 5mA 90Ω 2µA 3.9mm -
RS Stock No. 184-4617
Mfr. Part No.1N5252B
SGD0.077
Each (In a Pack of 250)
units
Single 24V Through Hole 1 500 mW DO-35 General Purpose 5% 2 5.2mA 33 Ω @ 5.2 mA, 600 Ω @ 0.25 mA 100nA - -
RS Stock No. 165-5029
Mfr. Part No.Z1SMA16 TRTB
SGD0.137
Each (On a Reel of 7500)
units
Single 16V Surface Mount 1 3.25 W DO-214AC (SMA) - ±5% 2 25mA 15Ω 1µA 5.1mm 2.6mm
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