What this HEXFET N-channel is and where it fits
The Infineon IRF1405PBF is a 55V, 169A continuous-drain N-channel power MOSFET from the HEXFET series, in a through-hole TO-220-3 package. It is built for low on-resistance switching — 5.3 mOhm max at 101A with a 10V gate drive — which keeps conduction losses down in high-current paths like motor drives, DC-DC converters, battery isolation switches, and power-supply output stages. The junction temperature range of -55°C to 175°C means it can live in a hot enclosure or under a heatsink without derating drama.
Package and field-service angle
TO-220-3 through-hole. That means you can swap this on site with a basic soldering iron and a solder sucker — no hot-air station, no preheater. The tab is the drain, the leads are gate and source; orientation is obvious once you have the datasheet pinout in front of you. If you are stocking a field-repair kit, this is the kind of part that fits: common package, single-screw mount to a heatsink, no fragile SMD pads to lift.
Lifecycle and sourcing posture
The IRF1405PBF carries an Active product status and is ROHS3 compliant. For BOM planning, this is a stable line item — no imminent obsolescence risk.