WST4041

WST4041 is a WINSOK P-channel trench MOSFET in the SOT-23-3L package, verified against the maker’s own WST4041 datasheet (Dec 2014, winsok.tw). Verified figures: drain-source voltage of −40 V, gate-source voltage of ±20 V, continuous drain current of −6.0 A at a 25 °C case temperature (−4.5 A at 100 °C), pulsed drain current of −24 A, power dissipation of 1.4 W, and a storage range of −55 °C to +150 °C. From the electrical table: drain-source breakdown of −40 V minimum; on-state resistance of 30 mΩ typical and 40 mΩ maximum at −10 V gate drive and −3 A drain current, and 40 mΩ typical and 58 mΩ maximum at −4.5 V gate drive and −1 A; gate-threshold voltage of −0.8 V minimum, −1.2 V typical and −2.2 V maximum; drain-source leakage of 5 µA maximum at 55 °C; total gate charge of 9.5 nC typical; input capacitance of 420 pF typical; and source-drain diode forward voltage of −1.2 V maximum. An earlier version of this page carried the sibling WST4045 sheet’s figures in error; every figure above is from the WST4041 document itself. The selection point is a −40 V high-side switch in a three-lead footprint for load switching and power-path control where the package’s thermal path limits dissipation to the 1.4 W row above. Selection advice: budget conduction loss on the −4.5 V resistance row when the gate is driven from a logic-level rail, not on the −10 V row. Parameters verified against the WINSOK WST4041 datasheet.