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...

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Microchip PAC1954T-E/4MX 450 μA Power Monitor 16-Pin VQFN 5.5V
Microchip PAC1954T-E/4MX 450 μA Power Monitor 16-Pin VQFN 5.5V
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RS Stock No.: 764-323Brand: MicrochipManufacturers Part No.: PAC1954T-E/4MX

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Microchip
Power Monitor
Power Path Controller
±1 %
Surface Mount
VQFN
16
2.7V
5.5V
-
RoHS
3mm
0.9mm
125°C
PAC1954
-40°C
AEC-Q100
450μA
Nexperia 370 μA Constant Current Diode 5-Pin SC-88 75 V
Nexperia 370 μA Constant Current Diode 5-Pin SC-88 75 V
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RS Stock No.: 170-4833Brand: NexperiaManufacturers Part No.: PSSI2021SAY,115

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Nexperia
Constant Current Diode
Constant Current Source
-
Surface
SC-88
5
-
75V
-
No
2.2mm
1mm
150°C
PSSI2021SAY
-65°C
No
370μA
DiodesZetex BCR421UW6Q-7 1.2 mA Constant Current Diode 6-Pin SOT-26 40 V
DiodesZetex BCR421UW6Q-7 1.2 mA Constant Current Diode 6-Pin SOT-26 40 V
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RS Stock No.: 133-3345Brand: DiodesZetexManufacturers Part No.: BCR421UW6Q-7

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DiodesZetex
Constant Current Diode
Linear LED CONSTANT CURRENT REGULATOR
-
Surface
SOT-26
6
-
40V
-
No
3.1mm
1.3mm
150°C
BCR421
-55°C
AEC-Q100
1.2mA
Texas Instruments LM334Z/NOPB 10 mA Constant Current Diode 3-Pin TO-92 40 V
Texas Instruments LM334Z/NOPB 10 mA Constant Current Diode 3-Pin TO-92 40 V
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RS Stock No.: 535-9098Brand: Texas InstrumentsManufacturers Part No.: LM334Z/NOPB

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Texas Instruments
Constant Current Diode
Current Regulator
±3 %
Through Hole
TO-92
3
1V
40V
Current
No
5.2mm
5.2mm
70°C
LM334
0°C
No
10mA
Texas Instruments LM234Z-3/NOPB 10 mA Programmable Current Source 3-Pin TO-92 40 V
Texas Instruments LM234Z-3/NOPB 10 mA Programmable Current Source 3-Pin TO-92 40 V
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RS Stock No.: 761-5472Brand: Texas InstrumentsManufacturers Part No.: LM234Z-3/NOPB

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Texas Instruments
Programmable Current Source
Current Regulator
±3 %
Through Hole
TO-92
3
1V
40V
Current
No
5.2mm
5.2mm
100°C
LM234
-25°C
No
10mA
DiodesZetex AL5809-30QP1-7 150 mA Constant Current Diode 2-Pin PDI123 60 V
DiodesZetex AL5809-30QP1-7 150 mA Constant Current Diode 2-Pin PDI123 60 V
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RS Stock No.: 133-3334Brand: DiodesZetexManufacturers Part No.: AL5809-30QP1-7

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DiodesZetex
Constant Current Diode
2-Terminal Constant Current LED Driver
±5 %
Surface
PDI123
2
2.5V
60V
Low Side, High Side
No
3mm
1mm
150°C
AL5809
-40°C
No
150mA
Texas Instruments Constant Current Diode 8-Pin SOIC 40 V
Texas Instruments Constant Current Diode 8-Pin SOIC 40 V
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RS Stock No.: 197-7486Brand: Texas InstrumentsManufacturers Part No.: REF200AU

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Texas Instruments
Constant Current Diode
-
±0.5 %
Surface
SOIC
8
2.5V
40V
Current
No
5mm
1.75mm
85°C
REF200
-25°C
No
-
DiodesZetex AL5809-50QP1-7 150 mA Constant Current Diode 2-Pin PDI123 60 V
DiodesZetex AL5809-50QP1-7 150 mA Constant Current Diode 2-Pin PDI123 60 V
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RS Stock No.: 133-3335Brand: DiodesZetexManufacturers Part No.: AL5809-50QP1-7

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DiodesZetex
Constant Current Diode
Constant Current Regulator (CCR)
±5 %
Surface
PDI123
2
2.5V
60V
High Side, Low Side
TS16949, AEC-Q100, Halogen and Antimony Free, RoHS
3mm
1mm
150°C
AL5809Q
-40°C
AEC-Q100 Grade 3
150mA
Texas Instruments REF200AU Constant Current Diode 8-Pin SOIC 40 V
Texas Instruments REF200AU Constant Current Diode 8-Pin SOIC 40 V
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RS Stock No.: 197-7487Brand: Texas InstrumentsManufacturers Part No.: REF200AU

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Texas Instruments
Constant Current Diode
-
±0.5 %
Surface
SOIC
8
2.5V
40V
Current
No
5mm
1.75mm
85°C
REF200
-25°C
No
-
Texas Instruments LM234Z-6/NOPB 10 mA Programmable Current Source 3-Pin TO-92 30 V
Texas Instruments LM234Z-6/NOPB 10 mA Programmable Current Source 3-Pin TO-92 30 V
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RS Stock No.: 761-5476Brand: Texas InstrumentsManufacturers Part No.: LM234Z-6/NOPB

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Texas Instruments
Programmable Current Source
Current Regulator
±3 %
Through Hole
TO-92
3
1V
30V
Current
No
5.2mm
5.2mm
100°C
LM234
-25°C
No
10mA
Texas Instruments LM334M/NOPB 10 mA Constant Current Diode 8-Pin SOIC 40 V
Texas Instruments LM334M/NOPB 10 mA Constant Current Diode 8-Pin SOIC 40 V
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RS Stock No.: 535-9082Brand: Texas InstrumentsManufacturers Part No.: LM334M/NOPB

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Constant Current Diode
Current Regulator
±3 %
Surface
SOIC
8
1V
40V
Current
No
4.9mm
1.45mm
70°C
LM334
0°C
No
10mA
DiodesZetex 1.2 mA Constant Current Diode 6-Pin SOT-26 40 V
DiodesZetex 1.2 mA Constant Current Diode 6-Pin SOT-26 40 V
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RS Stock No.: 168-9550Brand: DiodesZetexManufacturers Part No.: BCR421UW6Q-7

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DiodesZetex
Constant Current Diode
Linear LED CONSTANT CURRENT REGULATOR
-
Surface
SOT-26
6
-
40V
-
No
3.1mm
1.3mm
150°C
BCR421
-55°C
AEC-Q100
1.2mA
DiodesZetex 150 mA Constant Current Diode 2-Pin PDI123 60 V
DiodesZetex 150 mA Constant Current Diode 2-Pin PDI123 60 V
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RS Stock No.: 168-9536Brand: DiodesZetexManufacturers Part No.: AL5809-120QP1-7

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DiodesZetex
Constant Current Diode
2-Terminal Constant Current LED Driver
±5 %
Surface
PDI123
2
2.5V
60V
Low Side, High Side
No
3mm
1mm
150°C
AL5809
-40°C
No
150mA
DiodesZetex 150 mA Constant Current Diode 2-Pin PDI123 60 V
DiodesZetex 150 mA Constant Current Diode 2-Pin PDI123 60 V
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RS Stock No.: 168-9539Brand: DiodesZetexManufacturers Part No.: AL5809-30QP1-7

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DiodesZetex
Constant Current Diode
2-Terminal Constant Current LED Driver
±5 %
Surface
PDI123
2
2.5V
60V
Low Side, High Side
No
3mm
1mm
150°C
AL5809
-40°C
No
150mA
DiodesZetex 20 mA Constant Current Diode 6-Pin SOT-23 6 V
DiodesZetex 20 mA Constant Current Diode 6-Pin SOT-23 6 V
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RS Stock No.: 165-8354Brand: DiodesZetexManufacturers Part No.: AP2502KTR-G1

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DiodesZetex
Constant Current Diode
4-Channel Linear Constant Current Sink
-
Surface
SOT-23
6
2V
6V
-
No
3.02mm
1.3mm
85°C
AP2502
-40°C
No
20mA
DiodesZetex AL5809-120QP1-7 150 mA Constant Current Diode 2-Pin PDI123 60 V
DiodesZetex AL5809-120QP1-7 150 mA Constant Current Diode 2-Pin PDI123 60 V
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RS Stock No.: 133-3331Brand: DiodesZetexManufacturers Part No.: AL5809-120QP1-7

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DiodesZetex
Constant Current Diode
2-Terminal Constant Current LED Driver
±5 %
Surface
PDI123
2
2.5V
60V
Low Side, High Side
No
3mm
1mm
150°C
AL5809
-40°C
No
150mA
DiodesZetex AP2502KTR-G1 20 mA Constant Current Diode 6-Pin SOT-23 6 V
DiodesZetex AP2502KTR-G1 20 mA Constant Current Diode 6-Pin SOT-23 6 V
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RS Stock No.: 921-0477Brand: DiodesZetexManufacturers Part No.: AP2502KTR-G1

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DiodesZetex
Constant Current Diode
4-Channel Linear Constant Current Sink
-
Surface
SOT-23
6
2V
6V
-
No
3.02mm
1.3mm
85°C
AP2502
-40°C
No
20mA
Nexperia PSSI2021SAY,115 370 μA Constant Current Diode 5-Pin SC-88 75 V
Nexperia PSSI2021SAY,115 370 μA Constant Current Diode 5-Pin SC-88 75 V
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RS Stock No.: 170-5384Brand: NexperiaManufacturers Part No.: PSSI2021SAY,115

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Nexperia
Constant Current Diode
Constant Current Source
-
Surface
SC-88
5
-
75V
-
No
2.2mm
1mm
150°C
PSSI2021SAY
-65°C
No
370μA
Texas Instruments 10 mA Constant Current Diode 3-Pin TO-92 40 V
Texas Instruments 10 mA Constant Current Diode 3-Pin TO-92 40 V
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RS Stock No.: 121-8833Brand: Texas InstrumentsManufacturers Part No.: LM334Z/NOPB

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Texas Instruments
Constant Current Diode
Current Regulator
±3 %
Through Hole
TO-92
3
1V
40V
Current
No
5.2mm
5.2mm
70°C
LM334
0°C
No
10mA
Texas Instruments 10 mA Constant Current Diode 8-Pin SOIC 40 V
Texas Instruments 10 mA Constant Current Diode 8-Pin SOIC 40 V
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RS Stock No.: 121-8832Brand: Texas InstrumentsManufacturers Part No.: LM334M/NOPB

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Texas Instruments
Constant Current Diode
Current Regulator
±3 %
Surface
SOIC
8
1V
40V
Current
No
4.9mm
1.45mm
70°C
LM334
0°C
No
10mA