The CSD19532Q5B: The 4.9 mOhm maximum Rds(on) at 10 V gate drive sets the conduction loss floor — at 17 A the on-resistance is already specified, giving a clear I²R budget for the thermal design.
Package and thermal — 8-VSON-CLIP with exposed pad
The 8-PowerTDFN package, supplied as 8-VSON-CLIP (5x6 mm), has a large exposed drain pad on the bottom. The datasheet rates 3.1 W dissipation at 25 °C ambient (no heatsink) and 195 W at the case — the actual thermal performance depends on the PCB copper area soldered to the exposed pad. The clip construction reduces package resistance and inductance compared to wire-bonded alternatives, which matters for high-current switching loops.
No official second-source or pin-compatible cross-reference is listed in the Texas Instruments NexFET family, so dual-sourcing requires a parametric alternative with the same 5x6 mm VSON-CLIP footprint.