What this OptiMOS N-channel does in a high-current automotive board
The Infineon IPB240N04S4R9ATMA1 is an N-channel MOSFET from the OptiMOS series, rated for 40 V drain-source and 240 A continuous drain current at 25 °C case temperature. It is built for high-current switching in automotive power trains, DC-DC converters, and electric pump or fan drives where conduction loss matters. The 0.87 mOhm maximum on-resistance at 10 V gate drive keeps I²R losses low at the 100 A operating point typical of these loads. AEC-Q101 qualification and a junction temperature range from -55 °C to 175 °C confirm it for under-hood and transmission-bay environments.
Gate drive and switching — what the 290 nC gate charge means
Gate charge is 290 nC at 10 V. The driver must supply that charge fast enough to keep switching edges clean.
Package and mounting — PG-TO263-7-3
The PG-TO263-7-3 (D²Pak with 6 leads plus tab) is a surface-mount package with a large exposed drain tab for heat sinking. The 300 W power dissipation rating at case temperature assumes the tab is soldered to a copper plane on the PCB. For 240 A continuous current, the board layout must handle the tab current and thermal path; a multi-layer board with thermal vias under the tab is standard practice. The 7-pin footprint (6 leads + tab) matches the standard D²Pak-7 land pattern.
Lifecycle and sourcing — active, no LTB risk
The IPB240N04S4R9ATMA1 carries an active product status with ROHS3 compliance. There is no last-time-buy notice or end-of-life announcement.