2SK971 MOSFET — Specifications & Equivalents
Manufacturer: Multi-source (JIS registered part number)
About the 2SK971
The 2SK971 is an N-channel MOSFET with a drain–source voltage (VDS) rating of 60 V, a continuous drain current (ID) of 15 A and an on-resistance (RDS(on)) of 0.065 Ω. It can dissipate up to 40 W and is rated to a junction temperature of 150 °C. It is supplied in the TO220AB package.
At a glance
- Type: N-channel MOSFET
- Max drain–source voltage (VDS): 60 V
- Max continuous drain current (ID): 15 A
- On-resistance (RDS(on)): 0.065 Ω
- Power dissipation (PD): 40 W
- Max junction temperature (TJ): 150 °C
- Package: TO220AB
- Manufacturer: Multi-source (JIS registered part number)
Typical applications
With its 60 V drain–source rating the 2SK971 sits in the mid-range class of switching MOSFETs, typically found in 24 V and 48 V industrial and battery systems, motor drives and H-bridges and load and hot-swap switching.
Gate drive and switching notes
Keep gate–source voltage within the ±20 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.
Switching behaviour is characterised by a rise time of 70 ns and an output capacitance (Coss) of 450 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the 2SK971
A drop-in substitute for the 2SK971 must be the same N-channel type and offer a drain–source rating of at least 60 V, a continuous drain current rating of at least 15 A and an on-resistance no higher than 0.065 Ω if efficiency and heat matter.
Mechanically, check the replacement against the TO220AB footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.
Because 2SK971 is a JIS-registered part number rather than one vendor's proprietary series, it is produced by several manufacturers. Datasheet figures vary slightly between them, so check the datasheet of the brand you actually buy — this also makes like-for-like sourcing easier.
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 2SK971?
The 2SK971 is an N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 60 V drain-source and 15 A continuous drain current.
What is the maximum voltage of the 2SK971?
The 2SK971 has a maximum drain-source voltage (Vds) of 60 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the 2SK971 handle?
It is rated for 15 A of continuous drain current, with power dissipation limited to 40 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the 2SK971?
On-resistance (Rds(on)) is 0.065 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the 2SK971 come in?
It is listed in TO220AB. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the 2SK971?
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) | 60 V |
| Gate-Source Voltage (Vgs) | 20 V |
| Drain Current (Id) | 15 A |
| Drain-Source On-Resistance (Rds) | 0.065 |
| Rise Time (tr) | 70 nS |
| Output Capacitance (Coss) | 450 pF |
| Junction Temperature (Tj) | 150 °C |
| Package | TO220AB |
| Power Dissipation (Pd) | 40 W |
Equivalent & Replacement Parts
No verified equivalents are listed for 2SK971 yet.