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FZT953TA

DIOFZT953TA

Diodes Incorporated
Bipolar (BJT) Transistor PNP 100 V 5 A 120MHz 3 W Surface Mount SOT-223-3
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Overview

The FZT953TA is a high-performance PNP bipolar junction transistor designed for high-current switching applications where low power loss is critical. It features an exceptionally high continuous collector current rating of 5A and a peak current capability of 15A within a compact SOT-223 surface-mount package. With a low saturation voltage of only 460mV at 5A, it minimizes heat dissipation in power management and driving circuits.

Why Choose This Part

The FZT953TA offers an industry-leading current-to-package ratio, allowing 5A continuous current in a SOT-223 footprint typically reserved for lower-power devices. Its excellent gain characteristics are specified up to 10A, ensuring consistent performance across a wide dynamic range. Additionally, the very low saturation voltage reduces the need for extensive heatsinking in space-constrained designs.

Applications

Linear Variable Reluctance Motors
Used as a high-current switch for driving inductive loads where low VCE(sat) is required to maintain efficiency.
Battery Charging Circuits
Acts as a pass transistor in charging paths due to its ability to handle continuous 5A currents with minimal voltage drop.
DC-DC Converters
Functions as a high-side switch in low-frequency switching regulators or linear post-regulators.
Solenoid and Relay Driving
Provides robust switching for heavy-duty electromechanical components requiring high peak current handling.

Key Specifications

Power - Max 3 W
Mounting Type Surface Mount
Package / Case TO-261-4, TO-261AA
Transistor Type PNP
Operating Temperature -55degC ~ 150degC (TJ)
Frequency - Transition 120MHz
Supplier Device Package SOT-223-3
Vce Saturation (Max) @ Ib, Ic 460mV @ 500mA, 5A
Current - Collector (Ic) (Max) 5 A
Current - Collector Cutoff (Max) 50nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce 100 @ 2A, 1V
Voltage - Collector Emitter Breakdown (Max) 100 V

Getting Started

When integrating this PNP transistor, ensure the SOT-223 collector pad is connected to a large copper area on the PCB to manage its 3W power dissipation rating. For switching applications, calculate the base resistor to provide at least 500mA of base current for 5A collector saturation as per the 460mV spec. Use standard BJT driving topologies such as an NPN-driven high-side switch configuration for logic-level control.

Also Consider

FZT853TA DIODiodes Incorporated - The NPN complementary pair to the FZT953TA for use in H-bridge or push-pull configurations.