The BTS307E3043 is a single-channel PROFET high-side power switch from Infineon, designed for general-purpose switching of resistive, inductive, and lamp loads. Its typical on-resistance of 220 mOhm at 25 °C sets the conduction loss floor: at the 1.4 A maximum continuous output, expect about 0.43 W dissipation in the switch alone, before accounting for the Rds(on) increase with junction temperature. The load supply range spans 5.8 V to 58 V, covering 12 V and 24 V automotive systems as well as industrial 48 V rails.
Fault protection set — no external supervisor needed
The open-load detect is particularly useful in automotive body controllers where a broken bulb or actuator wire must be flagged. Over-voltage protection clamps the output during load-dump transients on the battery line, reducing the need for an external TVS on the switch output.
Infineon lists the BTS307E3043 as Obsolete. No stock-holding claim — each buy is qualified per the BOM quantity.
TO-220-5 package — through-hole mounting note
The P-TO220-5 package is a 5-pin through-hole power package with an exposed metal tab for heat sinking. The tab is internally connected to the output drain — the PCB layout must isolate the tab or connect it to the load return path.