The BTS3050EJXUMA1 is a single-channel low-side N-channel switch from Infineon's HITFET® series, with a typical on-resistance of 44 mOhm. At 4 A continuous output, the conduction loss at 25°C junction is roughly 0.7 W — well within the thermal budget of the 8-SOIC exposed pad package if the PCB copper area is adequate. The 40 V load rating covers 12 V and 24 V nominal rails with derating headroom for load-dump transients.
On-chip fault protection — no external sense resistors
The switch integrates fixed current limiting, over-temperature shutdown, and over-voltage protection. That means no external current-sense resistor, no comparator, no protection diode — the BOM stays lean. The auto-restart feature lets the output recover after a fault clears, which is useful in lamp or motor loads where inrush current triggers the limit momentarily.