7.3 mOhm at 14 A — the switching-loss anchor
The IRF8327STRPBF is an N-channel MOSFET rated for 30 V drain-source and 14 A continuous drain current. The on-resistance is 7.3 mOhm maximum at Vgs = 10 V and Id = 14 A — this is the conduction loss figure a layout engineer multiplies by the duty cycle to size the copper pour and estimate junction temperature at the target switching frequency.
14 nC gate charge — drive budget at frequency
Gate charge (Qg) is 14 nC maximum at Vgs = 4.5 V. For a 500 kHz buck stage, the average gate drive current is 14 nC × 500 kHz = 7 mA — well within a standard gate-driver output. The threshold voltage (Vgs(th)) is 2.4 V maximum at 25 µA, meaning a 3.3 V logic-level drive turns the FET fully on with margin above the threshold. The ±20 V Vgs rating gives headroom for a 12 V gate-drive rail without clamping — the oxide stress stays inside the abs-max envelope even during start-up transients.
150 °C junction — thermal ceiling for a hot-switch design
Operating junction temperature spans -40 °C to 150 °C. The 2.2 W maximum power dissipation is the thermal budget at 25 °C ambient; at 85 °C ambient the budget derates by roughly 40% (per the typical derating curve for a DirectFET package on a 1-inch² copper pad). A rework-lab tech should pre-bake the parts at 125 °C for 48 hours if the moisture-barrier bag is punctured — the exposed-paddle DirectFET is MSL 1 sensitive and absorbs moisture through the backside die attach.