NSI45 Constant Current Regulators

onsemi NSI45 Constant Current Regulators are two-terminal linear constant current regulators. These regulators are simple, economical, and robust devices that provide a cost-effective solution for regulating current in LEDs. The NSI45 regulators are based on Self-Biased Transistor technology and regulate output current over a wide input voltage range. These regulators are designed with a negative temperature coefficient to protect LEDs from thermal runaway at extreme voltages and operating temperatures. The NSI45 regulators require no external components and have a high anode-cathode voltage rating that withstands surges common in automotive, industrial, and commercial signage applications.

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Description Datasheet Availability Pricing (GBP) Filter the results in the table by unit price based on your quantity.
Qty. RoHS ECAD Model Number of Outputs
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Output Current
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Supply Voltage - Min
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Output Voltage
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onsemi LED Lighting Driver ICs SOD 123 25mA 10% CCR
Datasheet
22,761In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 3,000
: 3,000

1 Output Boost, Buck 25 mA SOD-123 45 V 45 V 1 MHz Adjustable NSI45025A - 55 C + 150 C Constant Current Reel, Cut Tape, MouseReel
onsemi LED Lighting Driver ICs SOD 123 30mA 10% CCR
Datasheet
23,074In Stock
87,000On Order
MouseReel Available
Min.: 1
Mult.: 1
Max.: 6,000
: 3,000

1 Output Boost, Buck 30 mA SOD-123 45 V 45 V 1 MHz Adjustable NSI45030A - 55 C + 150 C Constant Current Reel, Cut Tape, MouseReel
onsemi LED Lighting Driver ICs LED Driver SOD 123 20mA 10% CCR
Datasheet
1,799In Stock
288,000On Order
MouseReel Available
Min.: 1
Mult.: 1
Max.: 6,000
: 3,000

1 Output Boost, Buck 20 mA SOD-123 45 V 45 V 1 MHz Adjustable NSI45020A - 55 C + 150 C Constant Current Reel, Cut Tape, MouseReel
onsemi LED Lighting Driver ICs SOD 123 20mA 15% CCR
Datasheet
5,729In Stock
69,000Expected 02/10/2026
MouseReel Available
Min.: 1
Mult.: 1
Max.: 3,700
: 3,000

1 Output Boost, Buck 20 mA SOD-123 45 V 45 V 1 MHz Adjustable NSI45020 - 55 C + 150 C Constant Current Reel, Cut Tape, MouseReel
onsemi LED Lighting Driver ICs SOT223 30mA 10% CCR
Datasheet
4,197In Stock
MouseReel Available
Min.: 1
Mult.: 1
Max.: 520
: 1,000

1 Output Boost, Buck 30 mA SOT-223 45 V 45 V 1 MHz Adjustable NSI45030AZ - 55 C + 150 C Constant Current Reel, Cut Tape, MouseReel
onsemi LED Lighting Driver ICs SOD 123 20MA 10% CCR
Datasheet
685In Stock
12,000On Order
MouseReel Available
Min.: 1
Mult.: 1
Max.: 3,000
: 3,000

1 Output Boost, Buck 20 mA SOD-123 45 V 45 V 100 Hz to 100 kHz Adjustable NSI45020A - 55 C + 150 C Constant Current AEC-Q100 Reel, Cut Tape, MouseReel
onsemi LED Lighting Driver ICs SOD 123 20MA 15% CCR
Datasheet
172In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

1 Output Boost, Buck 20 mA SOD-123-2 45 V 45 V 100 Hz to 100 kHz Adjustable NSI45020 - 55 C + 150 C Constant Current AEC-Q100 Reel, Cut Tape, MouseReel
onsemi LED Lighting Driver ICs SOD 123 25MA 10% CCR
Datasheet
3,000In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

SOD-123 NSI45025A AEC-Q100 Reel, Cut Tape, MouseReel
onsemi LED Lighting Driver ICs SOT223 25MA 10% CCR
Datasheet
1,990In Stock
Min.: 1
Mult.: 1
: 1,000

SOT-223 NSI45025AZ AEC-Q100 Reel, Cut Tape
onsemi LED Lighting Driver ICs SOD 123 30MA 10% CCR
Datasheet
5,398In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 3,000

1 Output Boost, Buck 30 mA SOD-123 45 V 45 V 100 Hz to 100 kHz Adjustable NSI45030A - 55 C + 150 C Constant Current AEC-Q100 Reel, Cut Tape, MouseReel
onsemi LED Lighting Driver ICs SOT223 25mA 10% CCR
Datasheet
20,813On Order
MouseReel Available
Min.: 1
Mult.: 1
: 1,000

1 Output Boost, Buck 25 mA SOT-223 45 V 45 V 1 MHz Adjustable NSI45025AZ - 55 C + 150 C Constant Current Reel, Cut Tape, MouseReel