Diodes Incorporated FZT788ATC

Overview

FZT788ATC from Diodes Incorporated is a PNP silicon planar medium-power high-gain bipolar junction transistor in SOT-223 package, rated for -15 V V_CEO, -3 A continuous collector current, and 2 W power dissipation at T_amb=25°C; it delivers h_FE ≥300 at I_C=−2 A and V_CE=−2 V, with V_CE(sat) ≤−0.25 V at I_C=−1 A/I_B=−5 mA, used in battery-powered load switching and linear regulation circuits.

For engineers reviewing the FZT788ATC datasheet, FZT788ATC pinout, FZT788ATC application, or FZT788ATC equivalent, key selection criteria include verified PNP polarity, SOT-223 thermal performance, low saturation voltage under −1 A to −3 A loads, gain stability across −55°C to +150°C, and complementary pairing with FZT688B for push-pull stages.

Technical Context

This PNP BJT operates in active, saturation, and cutoff regions with guaranteed h_FE of 300–1500 across I_C = −10 mA to −6 A at V_CE = −2 V, supporting both linear amplification and hard-switching roles. Its f_T = 100 MHz at I_C = −50 mA/V_CE = −5 V enables use in moderate-speed switching up to several hundred kHz.

Thermal design is enabled by its SOT-223 package with exposed emitter pad, delivering 62.5°C/W junction-to-ambient (R_θJA) on standard FR-4 PCBs. Safe operating area (SOA) curves confirm 1 s DC capability up to −10 V/−1 A and pulsed operation to −10 V/−5 A at 100 µs duty cycle.

Key Specifications

Pinout & Package

SOT-223 package with molded plastic body, exposed emitter thermal pad on underside, and three leads: Collector (lead 1), Base (lead 2), Emitter (lead 3). Pin 1 is marked by beveled edge or dot; pin numbering follows JEDEC TO-261AA standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZXTN25050DFH and MJD2955T4G, FZT788ATC offers optimal balance of low-voltage saturation performance, compact SOT-223 footprint, and high gain at 1–2 A - making it preferred for space-constrained, battery-operated designs where thermal budget is tight.

Availability

FZT788ATC is available at Aetrix Electronics and suitable for portable battery management, industrial linear regulators, automotive body control modules, and LED driver stages requiring stable component supply and long-term manufacturability.

Supply support for FZT788ATC 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 power management, signal integrity, and protection applications.

FZT788ATC belongs to the FZT series of medium-power bipolar transistors designed specifically for high-efficiency, thermally constrained switching and linear regulation in portable and automotive electronics.

FAQ

Is FZT788ATC RoHS compliant and halogen-free?

Yes, FZT788ATC meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The device uses lead-free matte tin plating on leads and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at ≤30°C/60% RH.

What is the maximum safe pulsed collector current for FZT788ATC?

The absolute maximum pulsed collector current is −8 A, specified under I_CM with pulse width ≤300 µs and duty cycle ≤2%. This rating is validated by SOA curves showing −5 A sustainable for 100 µs at V_CE = −10 V, enabling short-duration inrush or surge handling in power-up sequences.

Can FZT788ATC replace FZT788B in existing designs?

Yes - FZT788ATC is a direct replacement for FZT788B with identical electrical specifications, pinout, package, and thermal characteristics. The "TC" suffix denotes tape-and-reel packaging per EIA-481 standard; no circuit or layout changes are required for drop-in substitution.

Does FZT788ATC require a base resistor in switching applications?

Yes, a base resistor is mandatory to limit I_B and ensure saturation. For I_C = −2 A with h_FE = 300, minimum I_B = −6.7 mA is needed; using a 470 Ω resistor with −5 V drive yields −10.6 mA, guaranteeing robust saturation while keeping V_BE(sat) ≤−0.9 V per datasheet conditions.