BFC61 MOSFET — Specifications & Equivalents
About the BFC61
The BFC61 is an N-channel MOSFET with a drain–source voltage (VDS) rating of 1000 V, a continuous drain current (ID) of 3.6 A and an on-resistance (RDS(on)) of 4 Ω. It can dissipate up to 125 W and is rated to a junction temperature of 150 °C. It is supplied in the TO220 package.
At a glance
- Type: N-channel MOSFET
- Max drain–source voltage (VDS): 1000 V
- Max continuous drain current (ID): 3.6 A
- On-resistance (RDS(on)): 4 Ω
- Power dissipation (PD): 125 W
- Max junction temperature (TJ): 150 °C
- Package: TO220
Typical applications
With its 1000 V drain–source rating the BFC61 sits in the ultra-high-voltage class of switching MOSFETs, typically found in industrial ignition and igniter circuits, high-voltage pulse generators and electrostatic and CRT deflection stages. Ratings at this level demand careful creepage/clearance and insulation design on the PCB.
On-resistance of 4 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 805 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the BFC61
A drop-in substitute for the BFC61 must be the same N-channel type and offer a drain–source rating of at least 1000 V, a continuous drain current rating of at least 3.6 A and an on-resistance no higher than 4 Ω if efficiency and heat matter.
Mechanically, check the replacement against the TO220 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 BFC61?
The BFC61 is an N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 1000 V drain-source and 3.6 A continuous drain current.
What is the maximum voltage of the BFC61?
The BFC61 has a maximum drain-source voltage (Vds) of 1000 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the BFC61 handle?
It is rated for 3.6 A of continuous drain current, with power dissipation limited to 125 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the BFC61?
On-resistance (Rds(on)) is 4 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the BFC61 come in?
It is listed in TO220. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the BFC61?
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) | 1000 V |
| Drain Current (Id) | 3.6 A |
| Drain-Source On-Resistance (Rds) | 4 |
| Output Capacitance (Coss) | 805 pF |
| Junction Temperature (Tj) | 150 °C |
| Package | TO220 |
| Power Dissipation (Pd) | 125 W |
Equivalent & Replacement Parts
No verified equivalents are listed for BFC61 yet.