What this 40 V automotive-grade MOSFET brings to the BOM
The Infineon AUIRFS8407TRR is an N-channel HEXFET® power MOSFET rated at 40 V drain-source and 195 A continuous drain current, housed in a D2PAK surface-mount package. It is qualified to AEC-Q101, making it a direct fit for automotive power-train, DC-DC converter, and motor-drive stages where junction temperatures can reach 175°C. The 1.8 mOhm maximum on-resistance at 10 V gate drive keeps conduction losses low in high-current paths, which directly affects heatsink sizing and PCB copper budgeting.
Gate drive and switching considerations
Gate threshold is 4 V at 150 µA; maximum gate-source rating is ±20 V. Total gate charge is 225 nC at 10 V.
Package and mounting
The D2PAK (TO-263) surface-mount package allows reflow assembly and is suited for automated production lines. The large drain tab provides a low thermal resistance path to the PCB; a thermal via array under the tab is recommended to keep junction temperature within the 175°C limit under full load.
Lifecycle and sourcing
The AUIRFS8407TRR is listed as Active in production, so there is no last-time-buy risk for current or new designs.