CS1405 MOSFET — Specifications & Equivalents

About the CS1405

The CS1405 is a MOSFET with a drain–source voltage (V_DS) rating of 55 V and a continuous drain current (I_D) of 169 A. It can dissipate up to 330 W and is rated to a junction temperature of 150 °C. It is supplied in the TO-257 package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 55 V
• Max continuous drain current (I_D): 169 A
• Power dissipation (P_D): 330 W
• Max junction temperature (T_J): 150 °C
• Package: TO-257

Typical applications

With its 55 V drain–source rating the CS1405 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.

The 169 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.

Choosing a replacement for the CS1405

A drop-in substitute for the CS1405 should match its polarity and offer a drain–source rating of at least 55 V and a continuous drain current rating of at least 169 A.

Mechanically, check the replacement against the TO-257 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 CS1405?

The CS1405 is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 55 V drain-source and 169 A continuous drain current.

What is the maximum voltage of the CS1405?

The CS1405 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 CS1405 handle?

It is rated for 169 A of continuous drain current, with power dissipation limited to 330 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the CS1405 come in?

It is listed in TO-257. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the CS1405?

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.