1200 V, 6 A N-channel — what it handles
The STFW6N120K3: Rated 1200 V drain-source, 6 A continuous drain, 2.4 Ohm Rds(on) at 2.5 A, 10 V.
Gate charge and drive budget
Total gate charge is 34 nC at 10 V. Input capacitance is 1050 pF at 100 V drain-source.
STMicroelectronics lists the STFW6N120K3 as obsolete. Any stock offered should be verified against the original date code and ST's last-time-buy window to avoid counterfeits.
