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. 197-7486
Mfr. Part No.REF200AU
SGD11.37
Each (In a Tube of 75)
units
Single 100µA 3 40V 500MΩ 40V - SOIC 8 - - - - -
RS Stock No. 168-9540
Mfr. Part No.AL5809-50QP1-7
SGD0.328
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
RS Stock No. 253-847
Mfr. Part No.E-123
BrandSEMITEC
SGD2.748
Each (In a Pack of 5)
units
Single - 1 30V 0.08MΩ 3.8V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 197-7487
Mfr. Part No.REF200AU
SGD13.14
Each
units
Single 100µA 3 40V 500MΩ 40V - SOIC 8 - - - - -
New
RS Stock No. 208-8576
Mfr. Part No.LM334MX/NOPB
SGD1.129
Each (In a Pack of 25)
units
- 1mA 1 40V - 0.8V - SOIC 8 - - - - -
RS Stock No. 170-5384
Mfr. Part No.PSSI2021SAY,115
BrandNexperia
SGD0.408
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
RS Stock No. 822-5901
Mfr. Part No.LT3092IDD#PBF
SGD6.09
Each (In a Pack of 2)
units
Single - 1 - - - Surface Mount DFN 8 3 x 3 x 0.75mm 3mm 3mm 0.75mm +125 °C
RS Stock No. 133-3331
Mfr. Part No.AL5809-120QP1-7
SGD0.608
Each (In a Pack of 20)
units
Single - 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 919-9238
Mfr. Part No.LT3092ITS8TRMPBF
SGD4.251
Each (On a Reel of 500)
units
Single - 1 40V - - Surface Mount SOT-23 8 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm +125 °C
RS Stock No. 133-3335
Mfr. Part No.AL5809-50QP1-7
SGD0.552
Each (In a Pack of 20)
units
Single - 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 170-4833
Mfr. Part No.PSSI2021SAY,115
BrandNexperia
SGD0.186
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
RS Stock No. 165-8354
Mfr. Part No.AP2502KTR-G1
SGD0.189
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. 921-6819
Mfr. Part No.LM234Z-3/NOPB
SGD2.135
Each (On a Reel of 1800)
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. 168-9550
Mfr. Part No.BCR421UW6Q-7
SGD0.20
Each (On a Reel of 3000)
units
Single - 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. 761-8627
Mfr. Part No.LT3092ITS8#TRMPBF
SGD6.93
Each
units
Single - 1 40V - - Surface Mount SOT-23 8 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm +125 °C
RS Stock No. 121-8832
Mfr. Part No.LM334M/NOPB
SGD1.261
Each (In a Tube of 95)
units
Single - 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. 693-4025
Mfr. Part No.S-562T
BrandSEMITEC
SGD2.716
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. 133-3334
Mfr. Part No.AL5809-30QP1-7
SGD0.552
Each (In a Pack of 20)
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
SGD0.644
Each (On a Reel of 2500)
units
- 1mA 1 40V - 0.8V - SOIC 8 - - - - -
RS Stock No. 133-3345
Mfr. Part No.BCR421UW6Q-7
SGD0.513
Each (In a Pack of 20)
units
Single - 1 40V - - Surface Mount SOT-26 6 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm +150 °C