Constant Current Diodes

A constant current diode also called a current limiting diode (CLD), is an electronic device that regulates or limits current to a maximum value. This is important as it protects your circuit from harmful effects in the event of a short-circuit.

How do constant current diodes work?

Constant current diodes are made from a junction field-effect transistor, the simplest type of three-terminal semiconductor transistor which functions like a current limiter. They allow the current running through them to rise to a certain point and level off at a specific value. Unlike zener diodes constant current diodes maintain a constant current instead of the constant voltage.

Applications for constant current diodes

Constant current diodes can be used in several circuit applications. Examples of devices using constant current diodes include waveform generator circuits, timing circuits and battery chargers. Constant current diodes can also be used as a constant current source for LED drivers and can be used to replace holding coils in telephone connection devices.


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Description Price Diode Configuration Maximum Regulator Current Number of Elements per Chip Maximum Peak Operating Voltage Minimum Dynamic Impedance Maximum Limiting Voltage Mounting Type Package Type Pin Count Dimensions Length Width Height Maximum Operating Temperature
RS Stock No. 253-768
Mfr. Part No.E-102
BrandSEMITEC
PHP118.85
Each (In a Pack of 5)
units
Single - 1 100V 0.65MΩ 1.7V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 535-9098
Mfr. Part No.LM334Z/NOPB
PHP47.334
Each (In a Pack of 5)
units
Single 10mA 1 40V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +70 °C
RS Stock No. 121-8833
Mfr. Part No.LM334Z/NOPB
PHP21.107
Each (In a Box of 1800)
units
Single 10mA 1 40V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +70 °C
RS Stock No. 253-803
Mfr. Part No.E-352
BrandSEMITEC
PHP118.85
Each (In a Pack of 5)
units
Single - 1 100V 0.1MΩ 3.2V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 121-8832
Mfr. Part No.LM334M/NOPB
PHP41.885
Each (In a Tube of 95)
units
Single 10mA 1 40V - - Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm +70 °C
RS Stock No. 253-796
Mfr. Part No.E-272
BrandSEMITEC
PHP118.85
Each (In a Pack of 5)
units
Single - 1 100V 0.15MΩ 2.7V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 464-5326
Mfr. Part No.E-153
BrandSEMITEC
PHP118.85
Each (In a Pack of 5)
units
Single - 1 25V 0.03MΩ 4.3V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 465-0003
Mfr. Part No.E-103
BrandSEMITEC
PHP118.85
Each (In a Pack of 5)
units
Single - 1 30V 0.17MΩ 3.5V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 253-825
Mfr. Part No.E-562
BrandSEMITEC
PHP118.85
Each (In a Pack of 5)
units
Single - 1 100V 0.04MΩ 4.5V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 535-9082
Mfr. Part No.LM334M/NOPB
PHP56.08
Each (In a Pack of 5)
units
Single 10mA 1 40V - - Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm +70 °C
RS Stock No. 761-5472
Mfr. Part No.LM234Z-3/NOPB
PHP130.762
Each (In a Pack of 5)
units
Single - 1 40V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +100 °C
RS Stock No. 693-4031
Mfr. Part No.S-103T
BrandSEMITEC
PHP117.306
Each (In a Pack of 10)
units
Single 12mA 1 50V - 3.5V Surface Mount SMD 2 2.6 x 1.6 x 0.7mm 2.6mm 1.6mm 0.7mm +150 °C
RS Stock No. 168-9536
Mfr. Part No.AL5809-120QP1-7
PHP12.98
Each (On a Reel of 3000)
units
Single - 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
New
RS Stock No. 208-8575
Mfr. Part No.LM334MX/NOPB
PHP24.313
Each (On a Reel of 2500)
units
- 1mA 1 40V - 0.8V - SOIC 8 - - - - -
New
RS Stock No. 208-8576
Mfr. Part No.LM334MX/NOPB
PHP42.609
Each (In a Pack of 25)
units
- 1mA 1 40V - 0.8V - SOIC 8 - - - - -
RS Stock No. 253-746
Mfr. Part No.E-501
BrandSEMITEC
PHP118.85
Each (In a Pack of 5)
units
Single - 1 100V 2MΩ 1.1V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 693-4025
Mfr. Part No.S-562T
BrandSEMITEC
PHP117.306
Each (In a Pack of 10)
units
Single 6.5mA 1 100V - 4.5V Surface Mount SMD 2 2.6 x 1.6 x 0.7mm 2.6mm 1.6mm 0.7mm +150 °C
RS Stock No. 197-7486
Mfr. Part No.REF200AU
PHP418.803
Each (In a Tube of 75)
units
Single 100µA 3 40V 500MΩ 40V - SOIC 8 - - - - -
RS Stock No. 693-4035
Mfr. Part No.S-123T
BrandSEMITEC
PHP117.306
Each (In a Pack of 10)
units
Single 14.4mA 1 50V - 3.8V Surface Mount SMD 2 2.6 x 1.6 x 0.7mm 2.6mm 1.6mm 0.7mm +150 °C
RS Stock No. 170-4833
Mfr. Part No.PSSI2021SAY,115
BrandNexperia
PHP6.735
Each (On a Reel of 3000)
units
Single 50mA 2 75V - 73V Surface Mount SC-88A 5 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm +150 °C