TK100F04K3 MOSFET — Specifications & Equivalents
Manufacturer: Commonly produced by Toshiba
About the TK100F04K3
The TK100F04K3 is an N-channel MOSFET with a drain–source voltage (VDS) rating of 40 V, a continuous drain current (ID) of 100 A and an on-resistance (RDS(on)) of 0.003 Ω. It can dissipate up to 180 W and is rated to a junction temperature of 175 °C. It is supplied in the TO220SM package.
At a glance
- Type: N-channel MOSFET
- Max drain–source voltage (VDS): 40 V
- Max continuous drain current (ID): 100 A
- On-resistance (RDS(on)): 0.003 Ω
- Power dissipation (PD): 180 W
- Max junction temperature (TJ): 175 °C
- Package: TO220SM
- Manufacturer: Commonly produced by Toshiba
Typical applications
With its 40 V drain–source rating the TK100F04K3 sits in the low-voltage class of switching MOSFETs, typically found in 12 V and 24 V automotive and industrial rails, synchronous buck converters, load switching and reverse-polarity protection and H-bridges for small motors.
The 100 A current rating puts it in high-current territory, where conduction loss (I² × RDS(on)) and thermal design usually matter more than switching loss. Budget for adequate copper area and a heatsink.
The low 0.003 Ω on-resistance keeps conduction loss down, which suits synchronous rectification and continuous high-current paths.
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 21 ns and an output capacitance (Coss) of 1100 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the TK100F04K3
A drop-in substitute for the TK100F04K3 must be the same N-channel type and offer a drain–source rating of at least 40 V, a continuous drain current rating of at least 100 A and an on-resistance no higher than 0.003 Ω if efficiency and heat matter.
Mechanically, check the replacement against the TO220SM 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 TK100F04K3?
The TK100F04K3 is an N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 40 V drain-source and 100 A continuous drain current.
What is the maximum voltage of the TK100F04K3?
The TK100F04K3 has a maximum drain-source voltage (Vds) of 40 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the TK100F04K3 handle?
It is rated for 100 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 TK100F04K3?
On-resistance (Rds(on)) is 0.003 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the TK100F04K3 come in?
It is listed in TO220SM. Verify the pinout of the specific variant, as one outline can carry different pin assignments.
What can I use to replace the TK100F04K3?
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) | 40 V |
| Gate-Source Voltage (Vgs) | 20 V |
| Drain Current (Id) | 100 A |
| Drain-Source On-Resistance (Rds) | 0.003 |
| Rise Time (tr) | 21 nS |
| Output Capacitance (Coss) | 1100 pF |
| Junction Temperature (Tj) | 175 °C |
| Package | TO220SM |
| Power Dissipation (Pd) | 180 W |
Equivalent & Replacement Parts
No verified equivalents are listed for TK100F04K3 yet.