Its 8 mOhm max on-resistance at 40 A and 10 V gate drive suits a 55 V bus. The 142 nC gate charge at 10 V requires a driver capable of sourcing a solid current pulse. Rated for 80 A continuous drain at 25 °C case temperature, derate at higher ambient. The D2PAK (TO-263) footprint fits standard surface-mount assembly.
Junction temperature spans -55 to 175 °C, which covers under-hood automotive, industrial motor drives with hot enclosures, and outdoor telecom cabinets. The wide range also means the part can handle brief overload events without immediate failure — useful for inrush or short-circuit withstand in a breaker-less design. No AEC-Q101 qualification is listed in the record, so verify with ST if automotive-grade certification is required for your program.
STB140NF55T4 carries an Active product status, so it remains in normal production with no last-time-buy risk. ROHS3 compliant — no exemptions expiring.