600 V N-channel — the primary switch for offline supplies
The IRFBC40PBF is an N-channel power MOSFET rated for 600 V drain-to-source breakdown voltage, making it a primary switch candidate in offline AC-DC converters, PFC stages, and flyback topologies where the bus voltage can exceed 400 V under normal conditions and spike during line transients.
Gate threshold voltage is specified at 4 V max with 250 µA drain current, and the recommended drive voltage for achieving the rated Rds(on) is 10 V — a standard 12 V or 15 V gate drive rail from a PWM controller or driver IC works directly.
The junction temperature range spans -55 °C to 150 °C, covering industrial and military-temperature environments — the 150 °C upper limit allows the junction to rise above the case temperature under heavy load without immediate derating, though the Rds(on) doubles at 125 °C junction. Packaged in a TO-220-3 through-hole case with a TO-220AB supplier device package, the IRFBC40PBF mounts into a standard 0.100-inch pitch PCB footprint and accepts a clip-on or screw-mounted heatsink for thermal management.
It is ROHS3 compliant, consistent with the lead-free (PbF) suffix designation. No official successor or second-source cross-reference is listed in the manufacturer's lifecycle documentation.