80A high-side switch for automotive power distribution
The Texas Instruments TPS1HA08BQPWPRQ1 is a single-channel automotive-grade high-side power switch rated for a continuous output current of 80A with a typical on-resistance of just 9mOhm. 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 switch is AEC-Q100 qualified and specified over the full -40°C to 125°C automotive temperature range, making it suitable for under-hood and chassis-domain loads such as ECUs, transmission solenoids, and high-current actuator drivers.
9mOhm Rds(on) — what it means for the thermal budget
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. The PowerTSSOP's exposed pad (the 16-HTSSOP variant) must be soldered to a large copper pour on the PCB with adequate thermal vias. 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 supplier device package is listed as 16-HTSSOP. This is a surface-mount package designed for power dissipation — the exposed pad is the primary heat path. The PCB layout must include a matching copper pad with thermal vias to the ground plane. Without this, the 80A rating is not achievable. The package is supplied in Tape & Reel or Cut Tape options for volume assembly or prototype runs.
Active lifecycle and sourcing posture
The TPS1HA08BQPWPRQ1 is listed as Active with a ROHS3 compliance status. For current pricing and availability, submit an RFQ — the part is sourced and quoted to order, with availability and pricing confirmed at quote time. There is no LTB (last-time-buy) or obsolescence risk on this part at present.