KD3400SRG MOSFET — Specifications & Equivalents

About the KD3400SRG

The KD3400SRG is a MOSFET with a drain–source voltage (V_DS) rating of 30 V and a continuous drain current (I_D) of 5.3 A. It can dissipate up to 1.1 W and is rated to a junction temperature of 150 °C. It is supplied in the SOT23 package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 30 V
• Max continuous drain current (I_D): 5.3 A
• Power dissipation (P_D): 1.1 W
• Max junction temperature (T_J): 150 °C
• Package: SOT23

Typical applications

With its 30 V drain–source rating the KD3400SRG 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 45 pF, which together with the gate drive determines switching loss and the practical upper frequency limit.

Choosing a replacement for the KD3400SRG

A drop-in substitute for the KD3400SRG should match its polarity and offer a drain–source rating of at least 30 V and a continuous drain current rating of at least 5.3 A.

Mechanically, check the replacement against the SOT23 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 KD3400SRG?

The KD3400SRG is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 30 V drain-source and 5.3 A continuous drain current.

What is the maximum voltage of the KD3400SRG?

The KD3400SRG 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 KD3400SRG handle?

It is rated for 5.3 A of continuous drain current, with power dissipation limited to 1.1 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the KD3400SRG come in?

It is listed in SOT23. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the KD3400SRG?

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.