MMBFJ108 MOSFET — Specifications & Equivalents

About the MMBFJ108

The MMBFJ108 is a MOSFET with a drain–source voltage (V_DS) rating of 25 V and a continuous drain current (I_D) of 0.08 A. It can dissipate up to 0.35 W and is rated to a junction temperature of 150 °C. It is supplied in the SUPERSOT-3 package.

At a glance

• Type: MOSFET
• Max drain–source voltage (V_DS): 25 V
• Max continuous drain current (I_D): 0.08 A
• Power dissipation (P_D): 0.35 W
• Max junction temperature (T_J): 150 °C
• Package: SUPERSOT-3

Typical applications

With its 25 V drain–source rating the MMBFJ108 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.

At 0.08 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 ±25 V maximum; exceeding it punctures the gate oxide and destroys the device permanently.

Choosing a replacement for the MMBFJ108

A drop-in substitute for the MMBFJ108 should match its polarity and offer a drain–source rating of at least 25 V and a continuous drain current rating of at least 0.08 A.

Mechanically, check the replacement against the SUPERSOT-3 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 MMBFJ108?

The MMBFJ108 is a MOSFET (metal-oxide-semiconductor field-effect transistor). It is rated for 25 V drain-source and 0.08 A continuous drain current.

What is the maximum voltage of the MMBFJ108?

The MMBFJ108 has a maximum drain-source voltage (Vds) of 25 V. Treat this as an absolute maximum and design with margin, especially when switching inductive loads.

How much current can the MMBFJ108 handle?

It is rated for 0.08 A of continuous drain current, with power dissipation limited to 0.35 W. Real-world capability depends on your heatsinking and ambient temperature.

What package does the MMBFJ108 come in?

It is listed in SUPERSOT-3. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the MMBFJ108?

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.