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. 761-5476
Mfr. Part No.LM234Z-6/NOPB
kr 26,352
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. 921-6813
Mfr. Part No.LM234Z-6/NOPB
kr 15,483
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. 168-9540
Mfr. Part No.AL5809-50QP1-7
kr 2,695
Each (On a Reel of 3000)
Units
Single 50mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 133-3335
Mfr. Part No.AL5809-50QP1-7
kr 6,539
Each (In a Pack of 20)
Units
Single 50mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 761-5472
Mfr. Part No.LM234Z-3/NOPB
kr 42,224
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. 121-8833
Mfr. Part No.LM334Z/NOPB
kr 8,164
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. 165-8354
Mfr. Part No.AP2502KTR-G1
kr 1,866
Each (On a Reel of 3000)
Units
Single - 1 6V - - Surface Mount SOT-23 6 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm +85 °C
RS Stock No. 921-0477
Mfr. Part No.AP2502KTR-G1
kr 5,128
Each (In a Pack of 30)
Units
Single - 1 6V - - Surface Mount SOT-23 6 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm +85 °C
RS Stock No. 535-9098
Mfr. Part No.LM334Z/NOPB
kr 14,894
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. 921-6819
Mfr. Part No.LM234Z-3/NOPB
kr 21,587
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. 168-9539
Mfr. Part No.AL5809-30QP1-7
kr 2,695
Each (On a Reel of 3000)
Units
Single 30mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 133-3334
Mfr. Part No.AL5809-30QP1-7
kr 6,539
Each (In a Pack of 20)
Units
Single 30mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 133-3331
Mfr. Part No.AL5809-120QP1-7
kr 2,34
Each (In a Pack of 20)
Units
Single 120mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 168-9550
Mfr. Part No.BCR421UW6Q-7
kr 1,53
Each (On a Reel of 3000)
Units
Single 10mA 1 40V - - Surface Mount SOT-26 6 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm +150 °C
RS Stock No. 133-3345
Mfr. Part No.BCR421UW6Q-7
kr 4,251
Each (In a Pack of 20)
Units
Single 10mA 1 40V - - Surface Mount SOT-26 6 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm +150 °C
RS Stock No. 168-9536
Mfr. Part No.AL5809-120QP1-7
kr 2,255
Each (On a Reel of 3000)
Units
Single 120mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 197-7486
Mfr. Part No.REF200AU
kr 133,407
Each (In a Tube of 75)
Units
Single 100µA 3 40V 500MΩ 40V - SOIC 8 - - - - -
RS Stock No. 208-8576
Mfr. Part No.LM334MX/NOPB
kr 14,32
Each (In a Pack of 25)
Units
- 1mA 1 40V - 0.8V - SOIC 8 - - - - -
RS Stock No. 822-5901
Mfr. Part No.LT3092IDD#PBF
kr 55,78
Each (In a Pack of 2)
Units
Single 200mA 1 40V - - Surface Mount DFN 8 3 x 3 x 0.75mm 3mm 3mm 0.75mm +125 °C
RS Stock No. 170-5384
Mfr. Part No.PSSI2021SAY,115
BrandNexperia
kr 4,305
Each (In a Pack of 25)
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