G3205 MOSFET — Specifications & Equivalents

About the G3205

The G3205 is a MOSFET with a drain–source voltage (V_DS) rating of 55 V and a continuous drain current (I_D) of 110 A. It can dissipate up to 200 W and is rated to a junction temperature of 175 °C. It is supplied in the TO220 package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 55 V
• Max continuous drain current (I_D): 110 A
• Power dissipation (P_D): 200 W
• Max junction temperature (T_J): 175 °C
• Package: TO220

Typical applications

With its 55 V drain–source rating the G3205 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 110 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 671.5 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.

Choosing a replacement for the G3205

A drop-in substitute for the G3205 should match its polarity and offer a drain–source rating of at least 55 V and a continuous drain current rating of at least 110 A.

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 G3205?

The G3205 is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 55 V drain-source and 110 A continuous drain current.

What is the maximum voltage of the G3205?

The G3205 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 G3205 handle?

It is rated for 110 A of continuous drain current, with power dissipation limited to 200 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the G3205 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 G3205?

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.