SQD30N05-20L MOSFET — Specifications & Equivalents

About the SQD30N05-20L

The SQD30N05-20L is a MOSFET with a drain–source voltage (V_DS) rating of 55 V and a continuous drain current (I_D) of 30 A. It can dissipate up to 50 W and is rated to a junction temperature of 175 °C. It is supplied in the TO-252 package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 55 V
• Max continuous drain current (I_D): 30 A
• Power dissipation (P_D): 50 W
• Max junction temperature (T_J): 175 °C
• Package: TO-252

Typical applications

With its 55 V drain–source rating the SQD30N05-20L 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 ±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 203 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.

Choosing a replacement for the SQD30N05-20L

A drop-in substitute for the SQD30N05-20L should match its polarity and offer a drain–source rating of at least 55 V and a continuous drain current rating of at least 30 A.

Mechanically, check the replacement against the TO-252 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 SQD30N05-20L?

The SQD30N05-20L is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 55 V drain-source and 30 A continuous drain current.

What is the maximum voltage of the SQD30N05-20L?

The SQD30N05-20L 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 SQD30N05-20L handle?

It is rated for 30 A of continuous drain current, with power dissipation limited to 50 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the SQD30N05-20L come in?

It is listed in TO-252. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the SQD30N05-20L?

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.