Infineon BCR321UE6327HTSA1: 40 V Linear LED Controller in SOT-143B Package

The Infineon BCR321UE6327HTSA1 is a highly integrated linear constant current regulator designed specifically for driving LEDs. Representing a robust solution for low-to-medium power lighting applications, this device combines precise current regulation with a compact form factor, making it an excellent choice for space-constrained designs requiring reliability and efficiency.

Housed in the SOT-143B surface-mount package, this controller is engineered for automated PCB assembly, helping to reduce manufacturing costs and board space. Despite its small size, the component is built to handle a maximum operating voltage of 40 volts, providing sufficient headroom for a variety of LED configurations, including those with multiple LEDs in series.

A key feature of the BCR321U is its linear regulation topology. Unlike switching regulators, it operates without generating high-frequency electrical noise, which makes it particularly suitable for noise-sensitive environments such as automotive interior lighting, consumer appliances, and indicator lights. The device ensures a stable and flicker-free light output by maintaining a constant current through the LED, which is critical for both performance and longevity.

The regulator offers a straightforward implementation by requiring only a single external resistor to set the desired output current. This simplicity accelerates the design process and minimizes the bill of materials (BOM). Furthermore, the IC incorporates essential protection features, including thermal shutdown and over-voltage protection, safeguarding both the controller and the connected LEDs under fault conditions.

Its low dropout voltage characteristic enhances energy efficiency, making it suitable for battery-operated or energy-conscious applications. The BCR321UE6327HTSA1 stands out as a reliable, cost-effective, and simple solution for designers seeking to implement high-quality LED driving in their systems.

ICGOODFIND: The Infineon BCR321UE6327HTSA1 is a compact and robust 40 V linear LED controller, ideal for noise-sensitive, space-limited applications requiring simple design and reliable constant current output.

Keywords: Linear Regulator, Constant Current, SOT-143B Package, 40 Volts, Thermal Shutdown.