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NSI50350AST3G

50mA constant current regulator (CCR), 50V, SMA, 2-terminal, LED driver

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Pieza del fabricante：

NSI50350AST3G

Paquete：

SMA / DO-214AC (5.20 x 2.60 x 2.20 mm)

Marca：
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Descripción

Productos

The NSI50350AST3G from onsemi is a 50mA constant current regulator (CCR) in a SMA (DO-214AC) package. Using onsemi’s self-biased transistor (SBT) technology, it provides a simple two-terminal constant current source for LED driving without external current-setting resistors.

Especificaciones

Regulated Current 50 mA (+/-10%)
Maximum Operating Voltage 50 V
Forward Voltage (typ) 1.8 V @ 50mA
Temperature Coefficient 0.15%/C (typ)
Paquete SMA (DO-214AC)
Temperatura de funcionamiento -40C to +85C

Características

  • Fixed 50mA constant current output, no external components needed
  • Two-terminal device (anode and cathode), drop-in LED replacement
  • Self-biased transistor technology for stable current regulation
  • 50V maximum operating voltage for long LED strings
  • Negative temperature coefficient provides thermal protection

Aplicaciones

  • LED signage and channel letter lighting
  • Automotive interior and exterior LED lighting
  • LED strip and backlight driving
  • Low-voltage landscape lighting

The NSI50350AST3G from onsemi is a 50mA constant current regulator (CCR) in a SMA (DO-214AC) package using self-biased transistor (SBT) technology. As a simple two-terminal device, it acts as a constant current source that automatically regulates LED current to 50mA (+/-10%) without external resistors or control circuitry. The maximum operating voltage of 50V supports long LED strings. The device has a negative temperature coefficient of 0.15%/C, which naturally reduces current as temperature increases, providing inherent thermal protection. Forward voltage is typically 1.8V at 50mA, allowing operation with minimal headroom.

The NSI50350AST3G uses onsemi’s self-biased transistor (SBT) technology. (1) Self-Biasing: An internal JFET and BJT network creates a current mirror that maintains constant current regardless of voltage across the device (within the operating range). The JFET provides the bias current for the BJT current regulator. (2) Constant Current: The regulated current is determined by the internal transistor geometry and is fixed at 50mA. The device maintains this current as long as the voltage across it is between VF (1.8V) and the maximum operating voltage (50V). (3) Negative Temperature Coefficient: As junction temperature increases, the regulated current decreases at approximately 0.15%/C. This provides self-thermal limiting in LED strings, preventing thermal runaway. (4) Parallel Operation: Multiple CCRs can be connected in parallel to increase total LED current (e.g., two devices for 100mA).

Pin Nombre Tipo Función
1 Ánodo Entrada Positive terminal (connect to supply or LED string)
2 Cátodo Salida Negative terminal (connect to LED cathode or ground)
  • LED signage and channel letter lighting with 50mA per LED string
  • Automotive interior LED lighting with simple two-terminal design
  • LED strip and backlight driving with automatic current regulation
  • Low-voltage landscape lighting with 50V maximum for long strings
Fabricante Número de pieza Paquete Notas
onsemi NSI45030AT1G SOD-123 30mA version, smaller package
onsemi NSI45090AT1G SOD-123 90mA version
Diodos Inc AL5809-20P1-7 SOD-123 20mA CCR, similar concept
Infineon BCR430U SC-74 Adjustable LED driver
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Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

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Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

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Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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