150 V N-channel in an SO-8 — where the rating limits bite
It targets 48 V to 100 V bus rails in DC-DC converters, flyback supplies, and load switches where the board area is tight and the thermal path runs through the PCB copper.
The 280 mOhm maximum on-resistance is specified at Vgs=10 V and 1.14 A. The gate threshold is 5.5 V maximum at 250 µA, but the Rds(on) is only guaranteed at 10 V. Gate charge is 15 nC at 10 V, which keeps the drive current modest — about 1.5 mA per 100 kHz of switching frequency.
Thermal budget in an SO-8 — the copper is the heatsink
The maximum power dissipation is 2.5 W at 25 °C ambient, but that number assumes a standard FR-4 board with minimal copper. In practice, the SO-8 package relies on the PCB copper pour on the drain pads to conduct heat away. The junction temperature range is -55 to 150 °C, which qualifies the part for industrial environments and automotive under-hood zones where ambient heat can exceed 85 °C. The 150 °C ceiling is the absolute limit — derate the continuous current above 25 °C per the datasheet curve.
Input capacitance and switching speed
Input capacitance (Ciss) is 330 pF typical at Vds=25 V. That is moderate for a 150 V FET — it keeps the gate drive energy per cycle low, but it also means the Miller plateau is narrow enough that a 10–15 Ω gate resistor is usually enough to control ringing without slowing the edge too much.