The IRF540ZPBF is a 100 V, 36 A N-channel HEXFET® power MOSFET in a through-hole TO-220AB package.
Junction temperature range — 175°C maximum buys headroom in hot environments
That extra 25°C matters when the device sits near a motor winding, inside an engine-bay enclosure, or in a sealed industrial power supply where ambient air can reach 85°C and the case runs hotter. The 92 W power dissipation at case temperature gives a rough thermal budget: at 175°C Tj(max) and a 1.5°C/W junction-to-case thermal resistance (implied by 92 W at 25°C case), a 50 W load leaves about 75°C of junction rise above case.
Gate drive and switching — 10 V is the rated drive voltage
A 10 V rail is the natural drive level; at lower gate voltages the on-resistance climbs significantly. The 1770 pF input capacitance at 25 V drain-source is moderate — a typical 1 A gate driver can charge it to 10 V in roughly 30 ns, which keeps switching losses low in a 50–100 kHz converter. The 4 V threshold at 250 µA drain current means the device is fully off with a 0 V gate, but the threshold is high enough that a 3.3 V logic signal will not turn it on hard.