SKD503T MOSFET — Specifications & Equivalents

About the SKD503T

The SKD503T is a MOSFET with a drain–source voltage (V_DS) rating of 100 V and a continuous drain current (I_D) of 120 A. It can dissipate up to 227 W and is rated to a junction temperature of 150 °C. It is supplied in the TO220 package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 100 V
• Max continuous drain current (I_D): 120 A
• Power dissipation (P_D): 227 W
• Max junction temperature (T_J): 150 °C
• Package: TO220

Typical applications

With its 100 V drain–source rating the SKD503T 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.

The 120 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 952 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.

Choosing a replacement for the SKD503T

A drop-in substitute for the SKD503T should match its polarity and offer a drain–source rating of at least 100 V and a continuous drain current rating of at least 120 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 SKD503T?

The SKD503T is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 100 V drain-source and 120 A continuous drain current.

What is the maximum voltage of the SKD503T?

The SKD503T 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 SKD503T handle?

It is rated for 120 A of continuous drain current, with power dissipation limited to 227 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the SKD503T 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 SKD503T?

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.