Linear LED driver with 200 mA constant-current sink
The BCR421UE6327HTSA1 is a linear LED driver from Infineon, designed to sink up to 200 mA per channel with a 40 V output rating. The constant-current regulation keeps LED brightness stable across supply variations — useful for automotive taillight or interior lighting strings where the bus voltage swings with engine load.
PWM dimming and AEC-Q101 qualification
Dimming is handled via a PWM input, so the LED current is either full-on or off at the switching frequency — the linear regulator's output capacitor filters the ripple, and the LED sees a clean average current. Rated for the automotive temperature range under AEC-Q101, this part suits under-hood or cabin lighting where the ambient can hit 125 °C. The single-channel output with an integrated switch keeps the external BOM to a resistor and a bypass cap.
Active production and compliance
The PG-SC74-6 package is a standard SOT-457 footprint — the same land pattern used by many small-signal MOSFETs and linear regulators, so the board layout is straightforward.