55V 38A TrenchMOS in DPAK — automotive-grade power switch
The NXP BUK7230-55A,118 is an N-channel TrenchMOS power MOSFET from the Automotive, AEC-Q101 qualified series.
Temperature range and junction limits
The 88W power dissipation at case temperature gives thermal headroom for continuous conduction — but the junction limit is the binding constraint for real load profiles, not the package tab.
Gate threshold voltage is 4V maximum at 1mA drain current, but the on-resistance is specified at 10V drive — so a 10V gate rail is needed to hit the rated 30mOhm. The input capacitance is 1152 pF at 25V drain bias, which is moderate for a 38A device. That Ciss figure drives the gate charge and therefore the switching loss in a hard-switched converter; a gate driver with enough peak current to charge it in the target dead-time is the design-in check.