Diodes Incorporated FMMT722TA

Overview

FMMT722TA from Diodes Incorporated is a 70V PNP silicon low-saturation transistor in SOT23 package, rated for -1.5A continuous collector current, -220mV V_CE(sat) at -1A, and 625mW power dissipation. It serves as a high-side driver or load disconnect switch in automotive and industrial power control circuits requiring AEC-Q101 reliability.

For engineers reviewing the FMMT722TA datasheet, FMMT722TA pinout, FMMT722TA application, or FMMT722TA equivalent, key selection criteria include verified -70V V_CEO, R_CE(SAT) = 140mΩ, h_FE ≥ 175 at -1A, thermal resistance of 200°C/W (R_θJA), and SOT23 mechanical compatibility with automated assembly.

Technical Context

This PNP bipolar junction transistor operates with emitter-grounded configuration, supporting high-side switching by sinking load current through the collector. Its low saturation voltage and characterized h_FE up to -3A enable stable gain hold-up under pulsed loads.

Thermal performance is defined for surface-mount operation on 25mm × 25mm FR4 PCB with 1 oz copper; R_θJA de-rates linearly above +25°C, maintaining safe junction temperature under 150°C ambient with proper layout.

Key Specifications

Pinout & Package

Package: SOT23 - Surface-mount plastic package with matte tin-plated leads, JEDEC-compliant footprint, moisture sensitivity level 1, and UL 94V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-side switching applications.

Compared with ZXTN25050DFH and DMT3005LKQ, FMMT722TA uniquely combines -70V ruggedness, AEC-Q101 qualification, and BJT current gain-making it optimal for automotive high-side switches where voltage margin, reliability, and simple base drive are jointly critical.

Availability

FMMT722TA is available at Aetrix Electronics and suitable for automotive body electronics, industrial power sequencing, and DC-DC converter enable control requiring stable component supply and long-term lifecycle support.

Supply support for FMMT722TA 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The FMMT722TA belongs to Diodes' high-reliability bipolar transistor product line, engineered specifically for automotive and industrial power switching applications demanding AEC-Q101 compliance, low saturation loss, and robust thermal performance in compact SOT23 packages.

FAQ

What is the maximum safe operating temperature for FMMT722TA?

The FMMT722TA has an operating junction temperature range of -55°C to +150°C. With R_θJA = 200°C/W on standard PCB, sustained 1.5A operation requires ambient temperature ≤ +75°C to maintain T_J < +150°C. Derating curves in DS33239 confirm 0.5W max at +100°C ambient.

Can FMMT722TA replace a generic PNP transistor like BC807 in high-current applications?

No-BC807 is rated for only -500mA I_C and -45V V_CEO. FMMT722TA's -1.5A I_C and -70V V_CEO provide 3× current capacity and 56% higher voltage margin, making it unsuitable as a drop-in replacement unless circuit revalidation confirms thermal and gain stability at higher stress levels.

Is FMMT722TA suitable for PWM motor control?

Yes-its 40ns t_on and 700ns t_off support PWM frequencies up to ~500kHz, and -3A I_CM handles motor stall currents. However, ensure base drive delivers sufficient negative current (≥ -200mA) during saturation to maintain low V_CE(sat) across duty cycles.

Does FMMT722TA require a base resistor, and how is its value calculated?

Yes-a series base resistor is mandatory to limit IB and prevent damage. For -1A I_C, use h_FE(min) = 175 at that current: R_B = (V_GPIO − V_BE(sat)) / (I_C/h_FE) ≈ (3.3V − 0.94V) / (1A/175) ≈ 415Ω. Standard 390Ω or 470Ω resistors are appropriate.