STP78N75F4 MOSFET — Specifications & Equivalents
Manufacturer: Commonly produced by STMicroelectronics
About the STP78N75F4
The STP78N75F4 is an N-channel MOSFET with a drain–source voltage (VDS) rating of 75 V, a continuous drain current (ID) of 78 A and an on-resistance (RDS(on)) of 0.011 Ω. It can dissipate up to 150 W and is rated to a junction temperature of 175 °C. It is supplied in the TO220 package.
At a glance
- Type: N-channel MOSFET
- Max drain–source voltage (VDS): 75 V
- Max continuous drain current (ID): 78 A
- On-resistance (RDS(on)): 0.011 Ω
- Power dissipation (PD): 150 W
- Max junction temperature (TJ): 175 °C
- Package: TO220
- Manufacturer: Commonly produced by STMicroelectronics
Typical applications
With its 75 V drain–source rating the STP78N75F4 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.
The 78 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 0.011 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 33 ns and an output capacitance (Coss) of 382 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.
Choosing a replacement for the STP78N75F4
A drop-in substitute for the STP78N75F4 must be the same N-channel type and offer a drain–source rating of at least 75 V, a continuous drain current rating of at least 78 A and an on-resistance no higher than 0.011 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 STP78N75F4?
The STP78N75F4 is an N-channel MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 75 V drain-source and 78 A continuous drain current.
What is the maximum voltage of the STP78N75F4?
The STP78N75F4 has a maximum drain-source voltage (Vds) of 75 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.
How much current can the STP78N75F4 handle?
It is rated for 78 A of continuous drain current, with power dissipation limited to 150 W. Real-world capability depends on your heatsinking and ambient temperature.
What is the on-resistance of the STP78N75F4?
On-resistance (Rds(on)) is 0.011 Ω. Multiply by the square of your load current to estimate conduction loss.
What package does the STP78N75F4 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 STP78N75F4?
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) | 75 V |
| Gate-Source Voltage (Vgs) | 20 V |
| Drain Current (Id) | 78 A |
| Drain-Source On-Resistance (Rds) | 0.011 |
| Rise Time (tr) | 33 nS |
| Output Capacitance (Coss) | 382 pF |
| Junction Temperature (Tj) | 175 °C |
| Package | TO220 |
| Power Dissipation (Pd) | 150 W |
Equivalent & Replacement Parts
No verified equivalents are listed for STP78N75F4 yet.