299 mOhm on-resistance and gate charge
The maximum on-resistance (Rds(on)) is 299 mOhm at a drain current of 7 A and a gate drive of 10 V, which is the specified drive voltage for achieving the lowest Rds(on). The total gate charge (Qg) is 37 nC at 10 V, and the input capacitance (Ciss) is 1250 pF at 50 V drain-source — these numbers tell you the switching speed and driver requirements: a 37 nC gate charge means a modest gate driver can switch it fast without excessive power loss, but the 1250 pF input capacitance still needs a clean gate-drive layout to avoid ringing in a hard-switching converter.
No official replacement order code is listed by STMicroelectronics, so cross-referencing by parametric match (600 V, 14 A, 299 mOhm, TO-220) is the practical path for a drop-in substitute.