AO4423 MOSFET — Specifications & Equivalents

About the AO4423

The AO4423 is a MOSFET with a drain–source voltage (V_DS) rating of 30 V and a continuous drain current (I_D) of 17 A. It can dissipate up to 3.1 W and is rated to a junction temperature of 150 °C. It is supplied in the SO-8 package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 30 V
• Max continuous drain current (I_D): 17 A
• Power dissipation (P_D): 3.1 W
• Max junction temperature (T_J): 150 °C
• Package: SO-8
• Manufacturer: Commonly produced by Alpha & Omega Semiconductor

Typical applications

With its 30 V drain–source rating the AO4423 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.

Gate drive and switching notes

Keep gate–source voltage within the ±25 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.

Switching behaviour is characterised by an output capacitance (C_oss) of 583 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.

Choosing a replacement for the AO4423

A drop-in substitute for the AO4423 should match its polarity and offer a drain–source rating of at least 30 V and a continuous drain current rating of at least 17 A.

Mechanically, check the replacement against the SO-8 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 AO4423?

The AO4423 is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 30 V drain-source and 17 A continuous drain current.

What is the maximum voltage of the AO4423?

The AO4423 has a maximum drain-source voltage (Vds) of 30 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.

How much current can the AO4423 handle?

It is rated for 17 A of continuous drain current, with power dissipation limited to 3.1 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the AO4423 come in?

It is listed in SO-8. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the AO4423?

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.