BFC49 MOSFET — Specifications & Equivalents
About the BFC49
The BFC49 is an N-channel MOSFET with a drain–source voltage (VDS) rating of 600 V, a continuous drain current (ID) of 7.5 A and an on-resistance (RDS(on)) of 1.3 Ω. It can dissipate up to 180 W and is rated to a junction temperature of 150 °C. It is supplied in the TO247 package.
At a glance
- Type: N-channel MOSFET
- Max drain–source voltage (VDS): 600 V
- Max continuous drain current (ID): 7.5 A
- On-resistance (RDS(on)): 1.3 Ω
- Power dissipation (PD): 180 W
- Max junction temperature (TJ): 150 °C
- Package: TO247
Typical applications
With its 600 V drain–source rating the BFC49 sits in the high-voltage (offline) class of switching MOSFETs, typically found in primary-side switching in offline SMPS (flyback, forward and quasi-resonant), active PFC boost stages, half-bridge and full-bridge inverters, induction heating and electronic ballasts and BLDC and AC motor drives. The rating leaves usable margin above the ~325 V DC bus obtained by rectifying 230 VAC mains, which is why this class dominates offline power supplies.
On-resistance of 1.3 Ω is relatively high, so this part is better suited to low duty-cycle or low-current switching than to continuous high-current conduction.
Gate drive and switching notes
Switching behaviour is characterised by an output capacitance (Coss) of 764 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the BFC49
A drop-in substitute for the BFC49 must be the same N-channel type and offer a drain–source rating of at least 600 V, a continuous drain current rating of at least 7.5 A and an on-resistance no higher than 1.3 Ω if efficiency and heat matter.
Mechanically, check the replacement against the TO247 footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.
Where the application switches inductive loads or runs near the voltage limit, keep extra headroom rather than choosing a part that only just meets the original numbers.
Frequently asked questions
What is the BFC49?
The BFC49 is an N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 600 V drain-source and 7.5 A continuous drain current.
What is the maximum voltage of the BFC49?
The BFC49 has a maximum drain-source voltage (Vds) of 600 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the BFC49 handle?
It is rated for 7.5 A of continuous drain current, with power dissipation limited to 180 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the BFC49?
On-resistance (Rds(on)) is 1.3 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the BFC49 come in?
It is listed in TO247. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the BFC49?
No verified equivalents are listed yet. Choose a part of the same polarity that meets or exceeds every rating above and shares a compatible package and pinout.
Key Specifications
| Type | MOSFET |
|---|---|
| Channel Type | N -Channel |
| Drain-Source Voltage (Vds) | 600 V |
| Drain Current (Id) | 7.5 A |
| Drain-Source On-Resistance (Rds) | 1.3 |
| Output Capacitance (Coss) | 764 pF |
| Junction Temperature (Tj) | 150 °C |
| Package | TO247 |
| Power Dissipation (Pd) | 180 W |
Equivalent & Replacement Parts
No verified equivalents are listed for BFC49 yet.