Diodes Incorporated FZT789ATC

Overview

FZT789ATC from Diodes Incorporated is a 25V PNP medium-power transistor in SOT223 package, rated for -3A continuous collector current, with V_CE(sat) < -250mV at -1A and R_CE(sat) = 93mΩ. It delivers high DC current gain (h_FE = 300–800 at -10mA) and supports fast switching (t_on = 35ns, t_off = 400ns), making it suitable for MOSFET/IGBT gate driving in battery-powered fast-charge converters.

For engineers reviewing the FZT789ATC datasheet, FZT789ATC pinout, FZT789ATC application, or FZT789ATC equivalent, key selection criteria include its AEC-Q101 qualification, low saturation resistance, thermal performance on 25mm × 25mm 2oz copper, and complementary pairing with FZT689B for push-pull configurations.

Technical Context

This PNP bipolar junction transistor operates with a maximum V_CEO of -25V and V_CBO of -30V, supporting robust blocking in low-side switching and active clamping circuits. Its f_T of 100MHz enables stable operation up to mid-frequency switching applications.

The device exhibits specified h_FE up to -6A, ensuring reliable current amplification under peak load conditions. Thermal resistance R_θJA is 62.5°C/W when mounted on 25mm × 25mm 2oz FR4, enabling 2.0W power dissipation at +25°C ambient.

Key Specifications

Pinout & Package

Package: SOT223 - Surface-mount plastic package with exposed collector tab for enhanced thermal conduction; 0.112g weight; UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power transistor applications.

Compared with ZXTN25050DFH and MJD2955T4G, FZT789ATC uniquely balances low R_CE(sat), fast t_off, AEC-Q101 qualification, and SOT223 scalability-making it optimal for compact, high-reliability gate drivers and battery-fed power switches.

Availability

FZT789ATC is available at Aetrix Electronics and suitable for power MOSFET gate driving, battery-powered instrumentation, and fast-charge converter designs requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for FZT789ATC 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 FZT789ATC belongs to Diodes' high-reliability power transistor product line, engineered specifically for demanding gate-driving, power switching, and automotive body electronics applications where thermal stability and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum allowable junction temperature for FZT789ATC?

The FZT789ATC has an operating junction temperature range of -55°C to +150°C. Its absolute maximum T_J is +150°C; sustained operation above this threshold risks permanent degradation. Derating begins at +25°C ambient, with R_θJA = 62.5°C/W on 25mm × 25mm 2oz copper, limiting usable power to 2.0W at room temperature.

Is FZT789ATC pin-compatible with FZT689B?

No - FZT789ATC (PNP) and FZT689B (NPN) are complementary devices with identical SOT223 package outlines and pin assignments (C-E-B), but opposite polarity. Their electrical symmetry enables matched push-pull driver designs, though base drive polarity must be inverted between the two.

Does FZT789ATC require a heatsink in typical gate-driver applications?

In most gate-driver applications drawing ≤1A continuous collector current, no external heatsink is required. With R_θJA = 62.5°C/W on 25mm × 25mm 2oz copper and P_D ≈ 150mW at -1A/ -250mV, junction rise is ~9.4°C - well within limits. Heatsinking becomes advisable only above 2A average current or in sealed, high-ambient environments.

How does the AEC-Q101 qualification impact FZT789ATC's use in industrial applications?

AEC-Q101 qualification subjects FZT789ATC to accelerated stress tests (HTGB, TC, H3TRB) exceeding standard industrial requirements. While not mandatory for non-automotive use, this certification provides proven robustness against thermal cycling, humidity, and long-term bias stress - making it preferred for mission-critical industrial controllers, medical power supplies, and outdoor-rated equipment.