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. 535-9098
Mfr. Part No.LM334Z/NOPB
TWD31.20
Each (In a Pack of 5)
units
Single 10mA 1 40V - - Through Hole TO-92 3 5.2 x 4.19 x 5.2mm 5.2mm 4.19mm 5.2mm +70 °C
RS Stock No. 121-8833
Mfr. Part No.LM334Z/NOPB
TWD13.30
Each (In a Box 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 +70 °C
RS Stock No. 779-9615
Mfr. Part No.LT3092EST#PBF
TWD161.50
Each (In a Pack of 2)
units
Single 200mA 1 - - - Surface Mount SOT-223 3 + Tab 6.71 x 3.71 x 1.8mm 6.71mm 3.71mm 1.8mm +125 °C
RS Stock No. 253-780
Mfr. Part No.E-202
BrandSEMITEC
TWD78.40
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. 253-803
Mfr. Part No.E-352
BrandSEMITEC
TWD78.40
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. 165-8354
Mfr. Part No.AP2502KTR-G1
TWD4.40
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. 253-819
Mfr. Part No.E-452
BrandSEMITEC
TWD78.40
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. 693-4029
Mfr. Part No.L-1822
BrandSEMITEC
TWD152.00
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. 921-0477
Mfr. Part No.AP2502KTR-G1
TWD12.60
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. 170-4833
Mfr. Part No.PSSI2021SAY,115
BrandNexperia
TWD4.20
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
New
RS Stock No. 208-8575
Mfr. Part No.LM334MX/NOPB
TWD14.00
Each (On a Reel of 2500)
units
- 1mA 1 40V - 0.8V - SOIC 8 - - - - -
RS Stock No. 693-4013
Mfr. Part No.S-153T
BrandSEMITEC
TWD77.30
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
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. 253-730
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
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. 197-7486
Mfr. Part No.REF200AU
TWD276.10
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
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
RS Stock No. 253-724
Mfr. Part No.E-101
BrandSEMITEC
TWD78.40
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. 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. 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