MMFT2955ET1G

Updated: 2026-09-13

Overview

The MMFT2955ET1G is a P-channel enhancement mode power MOSFET designed for efficient power management in various electronic applications. Manufactured by ON Semiconductor, this component features a compact SOT-23 surface-mount package, making it suitable for space-constrained designs. As a P-channel MOSFET, it offers advantages in certain circuit configurations where the gate drive is referenced to the positive supply rail. The device is particularly valued for its low on-resistance (RDS(on)) and fast switching characteristics, which contribute to reduced power losses in operation.

Structure and Working Principle

The MMFT2955ET1G consists of a silicon-based MOSFET structure with source, drain, and gate terminals. When a sufficient negative voltage is applied to the gate relative to the source, it creates a conductive channel between the source and drain, allowing current to flow. The device operates in enhancement mode, meaning the channel is normally off (non-conductive) without gate bias. The threshold voltage (VGS(th)) typically ranges from -0.5V to -2.5V, with complete turn-on achieved at gate-source voltages around -10V. This characteristic makes it suitable for low-voltage control applications.

Key Features

Key specifications include a drain-source voltage (VDS) rating of -12V and continuous drain current (ID) of -1.5A. The low RDS(on) of 0.25Ω (max) at VGS = -4.5V ensures minimal conduction losses. The device features fast switching times (typically 10ns rise and 15ns fall) enabling efficient operation in PWM applications. Its small SOT-23 package offers space savings while maintaining good thermal performance, with a junction-to-ambient thermal resistance of 250°C/W.

Application Areas

Primary applications include power management in portable electronics, load switching circuits, and DC-DC converters. It's commonly used in battery-powered devices for power distribution control. The MOSFET also finds use in automotive electronics, industrial control systems, and consumer electronics where efficient power switching is required. Its compact size makes it particularly suitable for smartphones, tablets, and other space-constrained applications requiring reliable power management solutions.

Maintenance and Precautions

Proper handling requires ESD protection measures during installation and maintenance. The gate oxide is sensitive to electrostatic discharge, so anti-static procedures should be followed. Operating parameters should not exceed absolute maximum ratings, including VDS, ID, and power dissipation limits. Thermal considerations are important in high-current applications - proper PCB layout with adequate copper area helps dissipate heat effectively.

B2B Procurement Guide

When sourcing MMFT2955ET1G, verify manufacturer authenticity to avoid counterfeit components. ON Semiconductor provides full traceability for genuine parts. Consider purchasing through authorized distributors for reliable supply chains. Bulk pricing is typically available for quantities above 1,000 units, with price breaks at higher volumes. Lead times may vary based on market demand, so planning procurement in advance is advisable for production schedules.