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 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 Minimum Operating Temperature
RS Stock No. 253-780
Mfr. Part No.E-202
BrandSEMITEC
$4.378
Each (In a Pack of 5)
units
- 1 100V 0.25MΩ 2.3V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C -30 °C
RS Stock No. 779-9615
Mfr. Part No.LT3092EST#PBF
$7.96
Each (In a Pack of 2)
units
- 1 - - - Surface Mount SOT-223 3 + Tab 6.71 x 3.71 x 1.8mm 6.71mm 3.71mm 1.8mm +125 °C -40 °C
RS Stock No. 535-9098
Mfr. Part No.LM334Z/NOPB
$1.538
Each (In a Pack of 5)
units
10mA 1 40V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +70 °C 0 °C
RS Stock No. 761-5476
Mfr. Part No.LM234Z-6/NOPB
$2.122
Each (In a Pack of 5)
units
- 1 30V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +100 °C -25 °C
RS Stock No. 253-825
Mfr. Part No.E-562
BrandSEMITEC
$4.632
Each (In a Pack of 5)
units
- 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 -30 °C
RS Stock No. 921-6813
Mfr. Part No.LM234Z-6/NOPB
$1.076
Each (In a Tube of 1800)
units
- 1 40V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +100 °C -25 °C
RS Stock No. 121-8833
Mfr. Part No.LM334Z/NOPB
$0.622
Each (In a Box of 1800)
units
- 1 40V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +70 °C 0 °C
RS Stock No. 858-0898
Mfr. Part No.LT3092ETS8#TRMPBF
$7.82
Each (In a Pack of 5)
units
- 1 40V - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm +125 °C -40 °C
RS Stock No. 465-0003
Mfr. Part No.E-103
BrandSEMITEC
$4.378
Each (In a Pack of 5)
units
- 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 -30 °C
RS Stock No. 253-831
Mfr. Part No.E-822
BrandSEMITEC
$3.666
Each (In a Pack of 5)
units
- 1 30V 0.32MΩ 3.1V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C -30 °C
RS Stock No. 693-4022
Mfr. Part No.S-183T
BrandSEMITEC
$3.615
Each (In a Pack of 10)
units
20mA 1 40V - 4.6V Surface Mount SMD 2 2.6 x 1.6 x 0.7mm 2.6mm 1.6mm 0.7mm +150 °C -40 °C
RS Stock No. 170-5384
Mfr. Part No.PSSI2021SAY,115
BrandNexperia
$0.589
Each (In a Pack of 25)
units
50mA 2 75V - 73V Surface Mount SC-88A 5 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm +150 °C -65 °C
RS Stock No. 197-7486
Mfr. Part No.REF200AU
$12.70
Each (In a Tube of 75)
units
100µA 3 40V 500MΩ 40V - SOIC 8 - - - - - -
RS Stock No. 168-9540
Mfr. Part No.AL5809-50QP1-7
$0.338
Each (On a Reel of 3000)
units
- 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C -40 °C
RS Stock No. 133-3331
Mfr. Part No.AL5809-120QP1-7
$0.765
Each (In a Pack of 20)
units
- 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C -40 °C
RS Stock No. 464-5326
Mfr. Part No.E-153
BrandSEMITEC
$3.82
Each (In a Pack of 5)
units
- 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 -30 °C
RS Stock No. 535-9082
Mfr. Part No.LM334M/NOPB
$1.976
Each (In a Pack of 5)
units
- 1 40V - - Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm +70 °C 0 °C
RS Stock No. 822-5901
Mfr. Part No.LT3092IDD#PBF
$7.09
Each (In a Pack of 2)
units
- 1 - - - Surface Mount DFN 8 3 x 3 x 0.75mm 3mm 3mm 0.75mm +125 °C -40 °C
RS Stock No. 921-0477
Mfr. Part No.AP2502KTR-G1
$0.615
Each (In a Pack of 30)
units
- 1 6V - - Surface Mount SOT-23 6 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm +85 °C -40 °C
RS Stock No. 919-9238
Mfr. Part No.LT3092ITS8TRMPBF
$4.533
Each (On a Reel of 500)
units
- 1 40V - - Surface Mount SOT-23 8 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm +125 °C -40 °C