IRF4905PBF

IRF4905PBF is the Infineon IRF4905 P-channel MOSFET in TO-220, with the orderable part number and an active product status verified word-for-word on the maker’s product page. Verified figures: drain-source voltage of -55 V, on-state resistance of 20 mΩ maximum, continuous drain current of -74 A at a 25 °C case temperature, total gate charge of 120 nC typical, and total power dissipation of 200 W maximum. The selection point is the low on-resistance at a -55 V rating in the through-hole TO-220 body: a high-side switch and reverse-polarity protector for automotive and industrial 12 V and 24 V systems where conduction loss, not switching speed, dominates the budget. Selection advice: the -74 A figure is a case-temperature rating — budget the current at your real heatsink temperature and check the resistance at your actual gate drive, since the 20 mΩ ceiling is the maker’s guaranteed maximum, not a typical. Parameters verified against the Infineon IRF4905PBF datasheet.