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 diodesconstant 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 driversand 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
$4.076
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. 145-0208
Mfr. Part No.LT3092EST#PBF
$4.759
Each (In a Tube of 78)
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. 779-9615
Mfr. Part No.LT3092EST#PBF
$7.685
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. 921-6813
Mfr. Part No.LM234Z-6/NOPB
$1.152
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
$0.666
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. 253-825
Mfr. Part No.E-562
BrandSEMITEC
$3.408
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. 535-9098
Mfr. Part No.LM334Z/NOPB
$1.53
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
$2.22
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. 197-7487
Mfr. Part No.REF200AU
$14.74
Each
units
100µA 3 40V 500MΩ 40V - SOIC 8 - - - - - -
RS Stock No. 133-3345
Mfr. Part No.BCR421UW6Q-7
$0.549
Each (In a Pack of 20)
units
- 1 40V - - Surface Mount SOT-26 6 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm +150 °C -55 °C
RS Stock No. 920-0060
Mfr. Part No.LT3092IST#PBF
$5.275
Each (In a Tube of 78)
units
- 1 - - - Surface Mount SOT-223 3 + Tab 6.71 x 3.71 x 1.6984mm 6.71mm 3.71mm 1.698mm +125 °C -40 °C
RS Stock No. 693-4022
Mfr. Part No.S-183T
BrandSEMITEC
$3.365
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. 121-8832
Mfr. Part No.LM334M/NOPB
$1.994
Each (In a Tube of 95)
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. 253-768
Mfr. Part No.E-102
BrandSEMITEC
$3.976
Each (In a Pack of 5)
units
- 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 -30 °C
RS Stock No. 168-9536
Mfr. Part No.AL5809-120QP1-7
$0.576
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. 693-4025
Mfr. Part No.S-562T
BrandSEMITEC
$4.019
Each (In a Pack of 10)
units
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 -40 °C
RS Stock No. 253-819
Mfr. Part No.E-452
BrandSEMITEC
$4.076
Each (In a Pack of 5)
units
- 1 100V 0.07MΩ 3.7V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C -30 °C
RS Stock No. 919-9238
Mfr. Part No.LT3092ITS8TRMPBF
$5.568
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
RS Stock No. 465-0003
Mfr. Part No.E-103
BrandSEMITEC
$4.076
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. 197-7486
Mfr. Part No.REF200AU
$12.70
Each (In a Tube of 75)
units
100µA 3 40V 500MΩ 40V - SOIC 8 - - - - - -
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