600 V, 125 mOhm, 18 A — the hard-switching workhorse
The IPW60R125CFD7XKSA1: This is a hard-switching-optimised device from the OptiMOS CFD7 series, built for the primary side of switch-mode power supplies, PFC boost stages, and motor-drive inverters. The 600 V rating gives you 80 % derating margin on a 400 V DC bus, which is the standard headroom for flyback and half-bridge topologies.
Gate charge and switching loss — keep the driver honest
Total gate charge Qg is 36 nC at 10 V drive. Input capacitance Ciss is 1503 pF at 400 V drain-source, which sets the Miller plateau duration and the cross-conduction window in a half-bridge. Gate threshold voltage Vgs(th) is 4.5 V maximum at 390 µA drain current. That 4.5 V ceiling means a 10 V gate drive rail gives you a solid 5.5 V overdrive, pulling Rds(on) down to the rated 125 mOhm. Do not try to run this part on 5 V logic — the margin is too thin and conduction loss climbs fast.
Thermal and mechanical — TO-247 through-hole reality
Maximum power dissipation is 92 W at case temperature Tc. The TO-247-3 package with a copper tab lets you bolt the device to a heatsink — the junction-to-case thermal path is the limiting factor, not the silicon. Operating junction temperature covers -55°C to 150°C, so this part can sit in an engine bay or an outdoor telecom cabinet without a temperature-grade exception. Mounting is through-hole into the TO-247-3 footprint. The hole pattern and pad geometry are the same across the TO-247 family, so a board laid out for a 600 V CoolMOS sibling takes this part without a layout change.