MCH3409-TL MOSFET — Specifications & Equivalents

About the MCH3409-TL

The MCH3409-TL is a MOSFET with a drain–source voltage (V_DS) rating of 20 V and a continuous drain current (I_D) of 4 A. It can dissipate up to 1.56 W and is rated to a junction temperature of 150 °C. It is supplied in the SOT323 package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 20 V
• Max continuous drain current (I_D): 4 A
• Power dissipation (P_D): 1.56 W
• Max junction temperature (T_J): 150 °C
• Package: SOT323

Typical applications

With its 20 V drain–source rating the MCH3409-TL sits in the very-low-voltage class of switching MOSFETs, typically found in battery protection and power-path switching, point-of-load converters and logic-level load switching in portable devices.

Gate drive and switching notes

Keep gate–source voltage within the ±12 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.

Choosing a replacement for the MCH3409-TL

A drop-in substitute for the MCH3409-TL should match its polarity and offer a drain–source rating of at least 20 V and a continuous drain current rating of at least 4 A.

Mechanically, check the replacement against the SOT323 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 MCH3409-TL?

The MCH3409-TL is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 20 V drain-source and 4 A continuous drain current.

What is the maximum voltage of the MCH3409-TL?

The MCH3409-TL has a maximum drain-source voltage (Vds) of 20 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.

How much current can the MCH3409-TL handle?

It is rated for 4 A of continuous drain current, with power dissipation limited to 1.56 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the MCH3409-TL come in?

It is listed in SOT323. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the MCH3409-TL?

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.