Package and mounting
The BSO203SPNT: Surface-mount in the PG-DSO-8 (0.154" width, 3.90 mm body) — Infineon's PG-DSO-8 variant. The SOIC-8 footprint is standard, so board layout is straightforward. The thermal pad is the die attach through the package leads; there's no exposed pad, so thermal management relies on the PCB copper area connected to the drain pins. For the 2.35 W dissipation limit, a decent pour on the drain pins is enough for moderate duty cycles, but sustained 9 A will need attention to trace width and via stitching.
Temperature range and environment
Rated for -55°C to 150°C junction temperature — full military-grade temperature span. That makes it suitable for avionics, downhole, or outdoor telecom where the ambient can swing hard. The 150°C Tj max is the silicon limit, but the 2.35 W dissipation at Ta means actual case temperature will be the bottleneck in a hot enclosure.
Lifecycle and sourcing
The part is in current manufacture by Infineon as part of the OptiMOS series. For a BOM line that needs a P-channel SOIC-8 MOSFET at 20 V / 9 A, this is a straightforward fit with no supply chain surprises.