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. 121-8833
Mfr. Part No.LM334Z/NOPB
PHP23.761
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. 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. 121-8832
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. 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. 208-8575
Mfr. Part No.LM334MX/NOPB
PHP24.313
Each (On a Reel of 2500)
units
- 1mA 1 40V - 0.8V - SOIC 8 - - - - -
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. 761-5476
Mfr. Part No.LM234Z-6/NOPB
PHP72.03
Each (In a Pack of 5)
units
Single 10mA 1 30V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +100 °C
RS Stock No. 921-6819
Mfr. Part No.LM234Z-3/NOPB
PHP133.662
Each (On a Reel 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 +100 °C
RS Stock No. 761-5472
Mfr. Part No.LM234Z-3/NOPB
PHP148.69
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 +100 °C
RS Stock No. 921-6813
Mfr. Part No.LM234Z-6/NOPB
PHP83.685
Each (In a Tube 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 +100 °C
RS Stock No. 197-7487
Mfr. Part No.REF200AU
PHP486.20
Each
units
Single 100µA 3 40V 500MΩ 40V - SOIC 8 - - - - -
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 - - - - -