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. 693-4031
Mfr. Part No.S-103T
BrandSEMITEC
$0.673
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. 693-4013
Mfr. Part No.S-153T
BrandSEMITEC
$0.526
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. 168-9550
Mfr. Part No.BCR421UW6Q-7
$0.282
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. 920-0060
Mfr. Part No.LT3092IST#PBF
$4.66
Each (In a Tube of 78)
units
Single - 1 - - - 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. 133-3345
Mfr. Part No.BCR421UW6Q-7
$0.335
Each (In a Pack of 20)
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. 253-724
Mfr. Part No.E-101
BrandSEMITEC
$2.534
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. 822-5869
Mfr. Part No.LT3092IST#PBF
$7.02
Each (In a Pack of 2)
units
Single - 1 - - - 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. 919-9238
Mfr. Part No.LT3092ITS8TRMPBF
$4.727
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. 162-8581
Mfr. Part No.LM334SM/NOPB
$3.021
Each (In a Tube of 95)
units
Single - 1 40V - - Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm +70 °C
RS Stock No. 921-6819
Mfr. Part No.LM234Z-3/NOPB
$1.926
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. 693-4035
Mfr. Part No.S-123T
BrandSEMITEC
$0.625
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. 464-5326
Mfr. Part No.E-153
BrandSEMITEC
$1.686
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. 133-3331
Mfr. Part No.AL5809-120QP1-7
$0.559
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. 761-5472
Mfr. Part No.LM234Z-3/NOPB
$3.698
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. 168-9536
Mfr. Part No.AL5809-120QP1-7
$0.524
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. 168-9539
Mfr. Part No.AL5809-30QP1-7
$0.463
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. 824-6831
Mfr. Part No.LM334SM/NOPB
$3.968
Each (In a Pack of 5)
units
Single - 1 40V - - Surface Mount SOIC 8 5 x 4 x 1.5mm 5mm 4mm 1.5mm +70 °C
RS Stock No. 133-3334
Mfr. Part No.AL5809-30QP1-7
$0.487
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. 253-746
Mfr. Part No.E-501
BrandSEMITEC
$2.422
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. 253-847
Mfr. Part No.E-123
BrandSEMITEC
$2.542
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
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