The TO-220-3 through-hole package makes it a straightforward swap on a customer site — no hot-air station needed, just a screwdriver and a soldering iron. This is the kind of part that lives in a field-service kit for PFC stages, offline flyback converters, and motor-drive bridges where 600 V isolation is non-negotiable.
Gate charge and switching — what 56 nC buys you
With a total gate charge of 56 nC at 10 V, the STP43N60DM2 is a moderate-speed switch — not the fastest in the MDmesh family, but fast enough for hard-switching topologies up to the 100 kHz range without excessive gate-drive losses. The input capacitance is 2500 pF at 100 V drain bias, which means the gate-driver sees a manageable load. Compare that to a higher-current sibling like the STP55N60DM2: you get a lower Rds(on) but a larger gate charge, so the trade-off is conduction loss versus switching loss. For a 600 V, 34 A design running at 50–70 kHz, this part hits the sweet spot.
Thermal reality — 250 W needs a heatsink
In practice, derate aggressively. The TO-220 package with a tab soldered to a copper island on the PCB or bolted to a finned heatsink is the standard approach.