The NP75N055YUK-E1-AY: The NP75N055YUK--AY: The Renesas NP75N055YUK--AY is an N-channel power MOSFET in the Automotive AEC-Q101 series, built for 12V and 24V vehicle electrical systems where load-dump transients can push the bus above 40V. With a 55V drain-source breakdown voltage, it clears the 40V load-dump clamp with margin, and the 75A continuous drain rating at 25°C case temperature covers high-current paths like battery isolation, electric oil pumps, and DC-DC converter input stages. The 4.5 mOhm maximum on-resistance at 10V gate drive and 38A load keeps conduction losses under 13W at full current — manageable with the 138W package limit at case temperature (Tc) if the PCB thermal design pulls heat into the board. The 1W derating at ambient (Ta) means this part needs a heatsink or copper pour for anything above light load; the 8-HSON (5x5.4) exposed pad is sized for solder-down to a thermal land.
Gate drive and switching — 83 nC Qg sets the driver budget
Total gate charge of 83 nC at 10V means the gate driver must supply about 8.3 µC per switching cycle. At 100 kHz switching, that's 0.83 A average gate current; a standard 1 A gate-driver IC handles it cleanly. The 5300 pF input capacitance at 25V drain bias confirms moderate gate capacitance — expect rise/fall times in the tens of nanoseconds with a 10V drive, which keeps cross-conduction losses low in hard-switched topologies.
175°C junction — under-hood thermal margin
Rated for a maximum junction temperature of 175°C, this MOSFET suits engine bay and transmission-mounted electronics where ambient can hit 125°C. The 4V maximum gate threshold at 250 µA drain current means the part fully enhances with standard 5V or 10V logic-level gate drives, but the 10V drive voltage for minimum Rds(on) is the recommended rail for lowest conduction loss.
Package and mounting — 8-PowerLDFN / 8-HSON
Surface-mount in the 8-PowerLDFN package (supplier device package 8-HSON, 5x5.4 mm body). The exposed pad is the drain connection — the PCB land pattern must replicate the pad dimensions for thermal and electrical contact.
ROHS3 compliant. AEC-Q101 qualification is confirmed by the series designation, covering the qualification flow for automotive stress tests (HBM, CDM, HTOL, HTRB, etc.).