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. 168-9540
Mfr. Part No.AL5809-50QP1-7
MYR1.312
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. 919-9238
Mfr. Part No.LT3092ITS8TRMPBF
MYR14.184
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. 133-3331
Mfr. Part No.AL5809-120QP1-7
MYR2.03
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. 253-819
Mfr. Part No.E-452
BrandSEMITEC
MYR9.262
Each (In a Pack of 5)
units
Single - 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
RS Stock No. 133-3334
Mfr. Part No.AL5809-30QP1-7
MYR2.115
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
MYR0.718
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. 253-831
Mfr. Part No.E-822
BrandSEMITEC
MYR9.262
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. 253-724
Mfr. Part No.E-101
BrandSEMITEC
MYR9.262
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. 921-0477
Mfr. Part No.AP2502KTR-G1
MYR1.539
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. 535-9082
Mfr. Part No.LM334M/NOPB
MYR4.038
Each (In a Pack of 5)
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. 170-5384
Mfr. Part No.PSSI2021SAY,115
BrandNexperia
MYR1.36
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. 253-780
Mfr. Part No.E-202
BrandSEMITEC
MYR9.262
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
New
RS Stock No. 197-7486
Mfr. Part No.REF200AU
MYR33.702
Each (In a Tube of 75)
units
Single 100µA 3 40V 500MΩ 40V - SOIC 8 - - - - -
RS Stock No. 822-5901
Mfr. Part No.LT3092IDD#PBF
MYR17.005
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. 693-4035
Mfr. Part No.S-123T
BrandSEMITEC
MYR4.76
Each (In a Pack of 10)
units
Single 14.4mA 1 50V - 3.8V Surface Mount SMD 2 2.6 x 1.6 x 0.7mm 2.6mm 1.6mm 0.7mm +150 °C
RS Stock No. 165-8354
Mfr. Part No.AP2502KTR-G1
MYR0.548
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. 168-9550
Mfr. Part No.BCR421UW6Q-7
MYR0.799
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. 253-803
Mfr. Part No.E-352
BrandSEMITEC
MYR9.262
Each (In a Pack of 5)
units
Single - 1 100V 0.1MΩ 3.2V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C
RS Stock No. 156-5698
Mfr. Part No.LT3092ETS8#TRMPBF
MYR13.119
Each (On a Reel of 500)
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. 693-4013
Mfr. Part No.S-153T
BrandSEMITEC
MYR4.76
Each (In a Pack of 10)
units
Single 18mA 1 50V - 4.3V Surface Mount SMD 2 2.6 x 1.6 x 0.7mm 2.6mm 1.6mm 0.7mm +150 °C
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