8 mOhm Rds(on) — where the heat budget lands
The IRL2505PBF: Gate charge is 130 nC at 5 V. Input capacitance Ciss is 5000 pF at 25 V drain-source, which sets the gate-drive impedance requirement for clean switching edges.
Junction temperature range and package
The TO-220AB (TO-220-3) package accepts a standard screw-mount heatsink; the tab is the drain terminal, so the heatsink pad must be electrically isolated or the system must tolerate a live tab. Maximum power dissipation is 200 W at case temperature — a figure that assumes the case is held at 25 °C, so real-world dissipation is lower and must be derated per the datasheet curve.