IRFY9120C MOSFET — Specifications & Equivalents

About the IRFY9120C

The IRFY9120C is a MOSFET with a drain–source voltage (V_DS) rating of 100 V and a continuous drain current (I_D) of 5.3 A. It can dissipate up to 30 W and is rated to a junction temperature of 150 °C. It is supplied in the TO257AB package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 100 V
• Max continuous drain current (I_D): 5.3 A
• Power dissipation (P_D): 30 W
• Max junction temperature (T_J): 150 °C
• Package: TO257AB
• Manufacturer: Commonly produced by International Rectifier (now Infineon)

Typical applications

With its 100 V drain–source rating the IRFY9120C sits in the medium-voltage class of switching MOSFETs, typically found in 48 V and 96 V distribution systems, solar and telecom power stages, DC motor drives and intermediate-bus DC-DC converters.

Choosing a replacement for the IRFY9120C

A drop-in substitute for the IRFY9120C should match its polarity and offer a drain–source rating of at least 100 V and a continuous drain current rating of at least 5.3 A.

Mechanically, check the replacement against the TO257AB 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 IRFY9120C?

The IRFY9120C is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 100 V drain-source and 5.3 A continuous drain current.

What is the maximum voltage of the IRFY9120C?

The IRFY9120C has a maximum drain-source voltage (Vds) of 100 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.

How much current can the IRFY9120C handle?

It is rated for 5.3 A of continuous drain current, with power dissipation limited to 30 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the IRFY9120C come in?

It is listed in TO257AB. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the IRFY9120C?

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.