Diodes Incorporated FMMT718QTA

Overview

FMMT718QTA from Diodes Incorporated is a 20V PNP silicon low-saturation transistor in SOT23 package, designed for high-current switching with V_CE(sat) < −200 mV at −1 A, R_CE(SAT) = 97 mΩ, and AEC-Q101 qualification for automotive gate driving and DC-DC converter applications.

For engineers reviewing the FMMT718QTA datasheet, FMMT718QTA pinout, FMMT718QTA application, or FMMT718QTA equivalent, key selection criteria include guaranteed −1.5 A continuous collector current, −6 A peak pulse rating, thermal resistance of 155 °C/W (note 6), and complementary pairing with FMMT618Q for push-pull topologies.

Technical Context

This PNP bipolar junction transistor operates with emitter-grounded configuration and supports fast switching via 68 ns turn-on and 270 ns turn-off times under −1 A load. Its h_FE remains ≥30 at −6 A, enabling stable current gain across wide dynamic range.

The device features low V_BE(sat) (−0.87 V typical at −1.5 A) and high f_T (150–180 MHz), making it suitable for high-frequency power control where saturation voltage and switching speed jointly impact conduction and switching losses.

Key Specifications

Pinout & Package

Package: SOT23 (Type DN), surface-mount plastic case with matte tin-plated leads, moisture sensitivity level 1 per J-STD-020, weight ≈ 0.008 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTN25050DFH and DMT3005LPSQ, FMMT718QTA uniquely balances −20 V rating, −1.5 A current, AEC-Q101 qualification, and SOT23 footprint-making it optimal for space-constrained automotive gate drivers where reliability and thermal density are prioritized over voltage headroom or zero-gate-drive convenience.

Availability

FMMT718QTA is available at Aetrix Electronics and suitable for automotive gate drivers, DC-DC converters, and charging circuits requiring stable component supply with full AEC-Q101 traceability and IATF16949 manufacturing assurance.

Supply support for FMMT718QTA 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-reliability components for automotive, industrial, and power management markets.

FMMT718QTA belongs to Diodes' FMMT series of low-saturation bipolar transistors engineered specifically for high-efficiency, high-reliability switching in automotive power systems and compact DC-DC topologies.

FAQ

What is the maximum operating temperature for FMMT718QTA?

The FMMT718QTA has an operating junction temperature range of −55°C to +150°C, validated per AEC-Q101 stress testing. At ambient temperatures above 75°C, power dissipation must be linearly derated from 806 mW using the 155 °C/W R_θJA value to maintain T_J ≤ 150°C.

Is FMMT718QTA pin-compatible with standard SOT23 PNP transistors?

Yes - FMMT718QTA uses the standard SOT23 (Type DN) pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This matches JEDEC MO-215 and Diodes' documented top-view marking orientation, ensuring mechanical and layout compatibility with other SOT23-packaged PNP devices.

How does FMMT718QTA's h_FE behavior differ at high current versus low current?

h_FE is characterized from 300 (at −10 mA) down to 15 (at −6 A), showing intentional gain compression at high current to improve stability and reduce secondary breakdown risk. This enables predictable saturation at −1.5 A with −50 mA base drive while maintaining safe SOA margins.

Can FMMT718QTA replace FMMT718 in non-automotive designs?

Yes - FMMT718QTA is functionally identical to FMMT718 except for its AEC-Q101 qualification, PPAP capability, and IATF16949 manufacturing. All electrical specs, pinout, and package dimensions match; the "Q" suffix denotes automotive-grade process control and test rigor, not functional differentiation.