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. 535-9082
Mfr. Part No.LM334M/NOPB
TWD37.00
Each (In a Pack of 5)
units
Single 10mA 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. 133-3335
Mfr. Part No.AL5809-50QP1-7
TWD14.90
Each (In a Pack of 20)
units
Single 50mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 168-9536
Mfr. Part No.AL5809-120QP1-7
TWD8.20
Each (On a Reel of 3000)
units
Single 120mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 168-9540
Mfr. Part No.AL5809-50QP1-7
TWD7.30
Each (On a Reel of 3000)
units
Single 50mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 253-825
Mfr. Part No.E-562
BrandSEMITEC
TWD78.40
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. 170-5384
Mfr. Part No.PSSI2021SAY,115
BrandNexperia
TWD11.00
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. 465-0003
Mfr. Part No.E-103
BrandSEMITEC
TWD78.40
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. 156-5698
Mfr. Part No.LT3092ETS8#TRMPBF
TWD83.80
Each (On a Reel of 500)
units
Single 200mA 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. 693-4031
Mfr. Part No.S-103T
BrandSEMITEC
TWD77.30
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. 822-5901
Mfr. Part No.LT3092IDD#PBF
TWD170.00
Each (In a Pack of 2)
units
Single 200mA 1 40V - - Surface Mount DFN 8 3 x 3 x 0.75mm 3mm 3mm 0.75mm +125 °C
New
RS Stock No. 208-8576
Mfr. Part No.LM334MX/NOPB
TWD24.60
Each (In a Pack of 25)
units
- 1mA 1 40V - 0.8V - SOIC 8 - - - - -
RS Stock No. 253-768
Mfr. Part No.E-102
BrandSEMITEC
TWD78.40
Each (In a Pack of 5)
units
Single - 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
RS Stock No. 921-6813
Mfr. Part No.LM234Z-6/NOPB
TWD41.30
Each (In a Tube of 1800)
units
Single 10mA 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. 133-3334
Mfr. Part No.AL5809-30QP1-7
TWD14.90
Each (In a Pack of 20)
units
Single 30mA 1 60V - - Surface Mount PDI123 2 3 x 1.93 x 1mm 3mm 1.93mm 1mm +150 °C
RS Stock No. 921-6819
Mfr. Part No.LM234Z-3/NOPB
TWD45.40
Each (On a Reel of 1800)
units
Single 10mA 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. 822-5869
Mfr. Part No.LT3092IST#PBF
TWD233.50
Each (In a Pack of 2)
units
Single 200mA 1 40V - - Surface Mount SOT-223 3 + Tab 6.71 x 3.71 x 1.6984mm 6.71mm 3.71mm 1.698mm +125 °C
RS Stock No. 253-796
Mfr. Part No.E-272
BrandSEMITEC
TWD78.40
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. 761-5476
Mfr. Part No.LM234Z-6/NOPB
TWD47.40
Each (In a Pack of 5)
units
Single 10mA 1 30V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +100 °C
RS Stock No. 197-7487
Mfr. Part No.REF200AU
TWD321.00
Each
units
Single 100µA 3 40V 500MΩ 40V - SOIC 8 - - - - -
RS Stock No. 253-730
Mfr. Part No.E-301
BrandSEMITEC
TWD83.20
Each (In a Pack of 5)
units
Single - 1 100V 4MΩ 0.8V Through Hole - 2 3.9 x 1.8 x 1.8mm 3.9mm 1.8mm 1.8mm +150 °C