Diodes Incorporated FMMT717TC

Overview

FMMT717TC from Diodes Incorporated is a 12V PNP silicon low-saturation transistor in SOT23 package, rated for -2.5A continuous collector current, -10A peak pulse current, and 625mW power dissipation. It delivers -17mV max V_CE(sat) at -100mA and achieves R_CE(sat) = 72mΩ at -2.5A, enabling efficient gate-driving of MOSFETs and IGBTs in compact DC-DC converters.

For engineers reviewing the FMMT717TC datasheet, FMMT717TC pinout, FMMT717TC application, or FMMT717TC equivalent, key selection criteria include verified PNP polarity, SOT23 thermal performance (R_θJA = 200°C/W), h_FE ≥ 300 at -10mA, -12V V_CEO, and ESD HBM rating of 4kV - all critical for high-reliability load-switch and battery-charging designs.

Technical Context

This PNP bipolar junction transistor operates with emitter-base forward bias and collector-emitter reverse blocking up to -12V. Its low saturation voltage and high-current gain retention (h_FE ≥ 45 at -10A) support stable switching under pulsed loads.

Designed for surface-mount operation on FR4 PCBs with single-sided 1 oz copper, it features JEDEC-compliant thermal derating (806mW at t ≤ 5 sec) and moisture sensitivity level 1 per J-STD-020 - ensuring robust manufacturability in automated assembly lines.

Key Specifications

Pinout & Package

Package: SOT23 - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 flammability rating, and 0.008 g mass. Optimized for high-density PCB layouts and reflow soldering compatibility.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP low-saturation transistor applications.

Compared with FMMT717TC, FMMT617 serves inverted topologies requiring NPN behavior, while ZXTN25050DFH trades saturation performance for higher voltage rating - making FMMT717TC optimal for 12 V, high-efficiency, high-current PNP switching where low V_CE(sat) and strong h_FE at load are essential.

Availability

FMMT717TC is available at Aetrix Electronics and suitable for gate-driving MOSFETs and IGBTs, battery charging circuits, and DC-DC conversion stages requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for FMMT717TC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.

The FMMT717TC belongs to Diodes' FMMT series of low-saturation bipolar transistors, engineered specifically for high-efficiency switching in space-constrained power conversion and load-control systems.

FAQ

What is the maximum allowable base current for FMMT717TC?

The absolute maximum base current is -500 mA, as specified in the Maximum Ratings table. Exceeding this value risks permanent damage to the base-emitter junction. For reliable operation, base current should be limited to ≤ -50 mA in continuous mode and ≤ -500 mA only during short pulses (<300 µs, duty cycle ≤2%), per datasheet test conditions.

Can FMMT717TC replace a standard general-purpose PNP transistor like BC807?

No - FMMT717TC is optimized for high-current, low-saturation switching, whereas BC807 has higher V_CE(sat) (-300 mV @ -500 mA) and lower I_C rating (-500 mA). Substituting BC807 would increase conduction loss by >15× at 2.5 A and risk thermal failure; FMMT717TC's 72 mΩ R_CE(sat) and 625 mW PD are purpose-built for demanding load-switch roles.

Is FMMT717TC suitable for automotive applications?

The standard FMMT717TC is not AEC-Q101 qualified, but its automotive-grade counterpart FMMT717Q is fully qualified per AEC-Q101 and shares identical electrical specs and SOT23 footprint. For automotive use, FMMT717Q must be selected - it undergoes extended temperature cycling, humidity testing, and mechanical shock validation beyond commercial-grade requirements.

How does the thermal resistance change between steady-state and short-pulse operation?

R_θJA is 200°C/W for steady-state (t > 5 sec) on 25 mm × 25 mm FR4 with 1 oz copper, but improves to 155°C/W for pulses ≤ 5 sec under identical conditions. This 22.5% reduction reflects reduced thermal accumulation, allowing brief peak currents up to -10 A (I_CM) without exceeding T_J(max) = +150°C, provided duty cycle remains ≤2%.