2N4093 MOSFET — Specifications & Equivalents

About the 2N4093

The 2N4093 is a MOSFET with a drain–source voltage (V_DS) rating of 40 V and a continuous drain current (I_D) of 0.008 A. It can dissipate up to 0.36 W and is rated to a junction temperature of 175 °C. It is available in TO-18 and TO-206AA packages, so confirm the pinout of the exact variant you order.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 40 V
• Max continuous drain current (I_D): 0.008 A
• Power dissipation (P_D): 0.36 W
• Max junction temperature (T_J): 175 °C
• Package: TO-18, TO-206AA
• Manufacturer: Multi-source (JEDEC registered part number)

Typical applications

With its 40 V drain–source rating the 2N4093 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.

At 0.008 A it is aimed at small-signal and light-load switching rather than power conversion.

Gate drive and switching notes

Keep gate–source voltage within the ±40 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.

Choosing a replacement for the 2N4093

A drop-in substitute for the 2N4093 should match its polarity and offer a drain–source rating of at least 40 V and a continuous drain current rating of at least 0.008 A.

Mechanically, check the replacement against the TO-18 and TO-206AA footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.

Because 2N4093 is a JEDEC-registered part number rather than one vendor's proprietary series, it is produced by several manufacturers. Datasheet figures vary slightly between them, so check the datasheet of the brand you actually buy — this also makes like-for-like sourcing easier.

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 2N4093?

The 2N4093 is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 40 V drain-source and 0.008 A continuous drain current.

What is the maximum voltage of the 2N4093?

The 2N4093 has a maximum drain-source voltage (Vds) of 40 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.

How much current can the 2N4093 handle?

It is rated for 0.008 A of continuous drain current, with power dissipation limited to 0.36 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the 2N4093 come in?

It is listed in TO-18 and TO-206AA. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the 2N4093?

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.