8 mOhm Rds(on) — the conduction loss floor for a 9A load
The Infineon BTS50090-1TMB is a single-channel PROFET high-side power switch rated for continuous loads up to 9A. Its 8 mOhm typical on-resistance keeps the voltage drop and self-heating low at full current — at 9A the conduction loss is about 0.65 W, which the TO-220-7 package can sink to a heatsink or PCB copper. The 5.5V to 38V load supply range covers 12V and 24V automotive and industrial rails.
Comprehensive fault protection — fewer external clamp circuits
The BTS50090-1TMB integrates current limiting (fixed), open-load detection, over-temperature shutdown, and over-voltage clamping. That means a single device handles the protection functions that would otherwise require a current-sense resistor, comparator, and TVS diode. The On/Off interface with a non-inverting input simplifies the drive from a 3.3V or 5V logic pin.
This part carries an Obsolete lifecycle status. No official replacement is listed on the Infineon cross-reference; any substitution requires a pin-compatible PROFET with similar Rds(on) and current rating, verified against the board layout.
TO-220-7 — through-hole for hand-solderable repairs
The PG-TO-220-7-12 package is a 7-lead through-hole TO-220 variant. The exposed metal tab provides a low thermal resistance path to the heatsink. For a rework or repair scenario, this package is hand-solderable with a standard iron — no hot-air reflow needed. The 0.50 mm pitch between leads is wide enough for manual soldering without bridging.