80A high-side switch for automotive power distribution
It operates from an 8V to 18V load supply, which covers the nominal 12V automotive rail with margin for cold-crank dips and load-dump spikes.
The 9mOhm typical Rds(on) is the key parameter that makes 80A continuous feasible in the 16-PowerTSSOP package. At 80A, conduction loss is I²R = 80² × 0.009 = 57.6W — that is a lot of heat to move. Without that thermal path, the junction temperature will exceed the 125°C limit well before 80A. For production designs, run the SOA (safe operating area) curves from the datasheet against your worst-case load current and ambient temperature.
Fault protection set — adjustable current limiting and open-load detect
The TPS1HA08BQPWPRQ1 integrates adjustable current limiting, open-load detection, over-temperature shutdown, and undervoltage lockout (UVLO). The adjustable current limit lets you set the trip point below the 80A maximum to protect the downstream wiring harness or load — a common requirement in automotive fuse-replacement designs. Open-load detect is useful for lamp or solenoid diagnostics where a broken wire must be flagged to the ECU. The UVLO ensures the switch turns off cleanly when the supply drops below the operating range, preventing the N-channel FET from operating in the linear region.
Package and thermal design: 16-PowerTSSOP with exposed pad
The part is housed in a 16-PowerTSSOP package (4.40mm width, 0.173" pitch) with an exposed thermal pad on the bottom. The PCB layout must include a matching copper pad with thermal vias to the ground plane. Without this, the 80A rating is not achievable.
There is no LTB (last-time-buy) or obsolescence risk on this part at present.