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 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. 253-796
Mfr. Part No.E-272
BrandSEMITEC
HK$9.358
Each (In a Pack of 5)
units
Single - 1 100V 0.15MΩ 2.7V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 921-6819
Mfr. Part No.LM234Z-3/NOPB
HK$11.593
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. 761-5472
Mfr. Part No.LM234Z-3/NOPB
HK$19.782
Each (In a Pack of 5)
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. 253-825
Mfr. Part No.E-562
BrandSEMITEC
HK$10.678
Each (In a Pack of 5)
units
Single - 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
RS Stock No. 693-4025
Mfr. Part No.S-562T
BrandSEMITEC
HK$6.443
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. 253-780
Mfr. Part No.E-202
BrandSEMITEC
HK$10.678
Each (In a Pack of 5)
units
Single - 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
RS Stock No. 253-724
Mfr. Part No.E-101
BrandSEMITEC
HK$12.80
Each (In a Pack of 5)
units
Single - 1 100V 6MΩ 0.5V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 464-5326
Mfr. Part No.E-153
BrandSEMITEC
HK$9.38
Each (In a Pack of 5)
units
Single - 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
RS Stock No. 253-746
Mfr. Part No.E-501
BrandSEMITEC
HK$9.614
Each (In a Pack of 5)
units
Single - 1 100V 2MΩ 1.1V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 461-9434
Mfr. Part No.REF200AU
HK$68.10
Each
units
Complex Array - 3 - - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm +85 °C
RS Stock No. 693-4031
Mfr. Part No.S-103T
BrandSEMITEC
HK$4.046
Each (In a Pack of 10)
units
Single 12mA 1 50V - 3.5V Surface Mount SMD 2 2.6 x 1.6 x 0.7mm 2.6mm 1.6mm 0.7mm +150 °C
RS Stock No. 253-831
Mfr. Part No.E-822
BrandSEMITEC
HK$9.358
Each (In a Pack of 5)
units
Single - 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
RS Stock No. 822-5901
Mfr. Part No.LT3092IDD#PBF
HK$31.07
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. 919-9238
Mfr. Part No.LT3092ITS8TRMPBF
HK$25.28
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. 253-847
Mfr. Part No.E-123
BrandSEMITEC
HK$9.284
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. 858-0898
Mfr. Part No.LT3092ETS8#TRMPBF
HK$33.298
Each (In a Pack of 5)
units
Single - 1 40V - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm +125 °C
RS Stock No. 693-4029
Mfr. Part No.L-1822
BrandSEMITEC
HK$40.50
1 Pack of 5
Pack(s)
- 22mA - 30V - 3.9V Through Hole - 2 10.5 x 4.1 x 9.8mm 10.5mm 4.1mm 9.8mm +150 °C
RS Stock No. 465-0003
Mfr. Part No.E-103
BrandSEMITEC
HK$6.886
Each (In a Pack of 5)
units
Single - 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
RS Stock No. 826-9288
Mfr. Part No.BCR410WH6327XTSA1
BrandInfineon
HK$1.044
Each (In a Pack of 100)
units
Single - 1 - - - Surface Mount SOT-343 4 2 x 1.25 x 0.8mm 2mm 1.25mm 0.8mm +150 °C
RS Stock No. 693-4022
Mfr. Part No.S-183T
BrandSEMITEC
HK$6.443
Each (In a Pack of 10)
units
Single 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
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