IRF2805 MOSFET — Specifications & Equivalents

About the IRF2805

The IRF2805 is a MOSFET with a drain–source voltage (V_DS) rating of 55 V and a continuous drain current (I_D) of 75 A. It can dissipate up to 330 W and is rated to a junction temperature of 175 °C. It is supplied in the TO220AB package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 55 V
• Max continuous drain current (I_D): 75 A
• Power dissipation (P_D): 330 W
• Max junction temperature (T_J): 175 °C
• Package: TO220AB
• Manufacturer: Commonly produced by International Rectifier (now Infineon)

Typical applications

With its 55 V drain–source rating the IRF2805 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 75 A current rating puts it in high-current territory, where conduction loss (I² × R_DS(on)) and thermal design usually matter more than switching loss. Budget for adequate copper area and a heatsink.

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 an output capacitance (C_oss) of 1190 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.

Choosing a replacement for the IRF2805

A drop-in substitute for the IRF2805 should match its polarity and offer a drain–source rating of at least 55 V and a continuous drain current rating of at least 75 A.

Mechanically, check the replacement against the TO220AB 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 IRF2805?

The IRF2805 is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 55 V drain-source and 75 A continuous drain current.

What is the maximum voltage of the IRF2805?

The IRF2805 has a maximum drain-source voltage (Vds) of 55 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.

How much current can the IRF2805 handle?

It is rated for 75 A of continuous drain current, with power dissipation limited to 330 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the IRF2805 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 IRF2805?

This page lists 17 candidate equivalents matched on electrical ratings and package. Any replacement should meet or exceed the original voltage, current and dissipation figures and use a compatible drive level.