8 mOhm at 70 A — the thermal budget call
The TPS1HB08BQPWPRQ1 is a single-channel high-side switch from TI's automotive-protected switch family, AEC-Q100 qualified for under-hood power distribution. Its headline number is the 8 mOhm typical Rds(on) — at 70 A continuous output that translates to roughly 39 W of conduction loss at 25°C junction, which climbs with temperature per the normalised curve.
Fault protection set without external parts
The adjustable current limit lets you set the trip point with a single resistor, avoiding the cost and board area of a sense resistor and comparator. The built-in fault coverage includes over-current, over-temperature, reverse-current blocking, and UVLO — the switch shuts itself off rather than letting the load cook the wiring harness. For a 12 V nominal automotive rail, the 3 V to 28 V supply range covers cold-crank down to 3 V and load-dump transients up to 28 V without external clamping.
Active production, no LTB on the horizon
For a production program that needs AEC-Q100 qualification and a 125°C operating range, this part is a stable BOM line — no forced redesign cycle from obsolescence risk.