Texas Instruments OPA544FKTTT

Overview

OPA544FKTTT from Texas Instruments (formerly Burr-Brown) is a high-voltage, high-current operational amplifier designed for demanding power-driving applications. It delivers ≥2A continuous output current, operates from ±10V to ±35V supplies, and features 8V/µs slew rate, FET-input bias current ≤100pA, and thermal shutdown protection. It drives motors, actuators, magnetic deflection coils, and programmable power supplies in industrial motion control and test equipment.

For engineers reviewing the OPA544FKTTT datasheet, OPA544FKTTT pinout, OPA544FKTTT application, or OPA544FKTTT equivalent, this page provides verified specifications, package-validated pin functions, real-world use cases, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The OPA544FKTTT integrates high-performance JFET-input circuitry with a monolithic high-power output stage capable of sourcing/sinking up to 2A continuously. Its internal current limit (~4A at 25°C, decreasing with junction temperature) and thermal shutdown (triggering at ~155°C) provide robust overload protection without external components.

It supports unbalanced supplies (e.g., –6V/+30V), maintains linear operation over a wide common-mode input range (±VS –6V), and requires external output compensation (e.g., 1Ω + 0.01µF) for stability with reactive loads like motors or capacitive cables.

Key Specifications

Pinout & Package

The OPA544FKTTT uses a 5-lead DDPAK/TO-263 (KTT) surface-mount package with an exposed copper thermal tab electrically connected to the V– supply pin. This design enables low-thermal-resistance mounting to PCB copper planes for efficient heat dissipation without mechanical screws or clips.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage, high-current op amp applications.

Compared with OPA544FKTTT, the OPA547FKTTT offers higher performance at the cost of greater power consumption and thermal load, while the LM675T trades protection and precision for lower cost and simpler qualification-but requires external current limiting and thermal monitoring to match basic OPA544FKTTT safety margins.

Availability

OPA544FKTTT is available at Aetrix Electronics and suitable for motor driver designs, programmable power supplies, servo amplifier modules, and magnetic actuator systems requiring stable component supply across extended industrial temperature ranges (–40°C to +85°C).

Supply support for OPA544FKTTT 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

Texas Instruments acquired Burr-Brown in 2000 and continues its legacy of precision analog ICs, emphasizing high-reliability, high-performance signal conditioning and power management solutions.

The OPA544FKTTT belongs to TI's OPA5xx high-current op amp product line, engineered specifically for industrial power-driving applications where robustness, thermal resilience, and integrated protection are essential.

FAQ

What is the maximum continuous output current of the OPA544FKTTT?

The OPA544FKTTT delivers ≥2A continuous output current into resistive loads at TCASE = +25°C with adequate heatsinking. Its safe operating area (SOA) defines derating curves for higher voltage drops (V_S–V_O) and elevated temperatures. At 25°C case temperature and ±35V supplies, it sustains 2A with proper thermal management-verified per the SOA graph in the official datasheet. The internal current limit activates at ~4A, but continuous operation beyond 2A requires careful thermal design.

Does the OPA544FKTTT include thermal shutdown protection?

Yes, the OPA544FKTTT includes fully integrated thermal shutdown that activates at approximately 155°C junction temperature. This feature disables the output stage to prevent permanent damage during overload, poor heatsinking, or ambient temperature excursions. The datasheet specifies a maximum recommended junction temperature of 150°C for reliable long-term operation. Thermal shutdown behavior may produce duty-cycle-modulated output under sustained overload-confirming activation requires measuring junction temperature under worst-case load conditions.

What package type does the OPA544FKTTT use, and how is the thermal tab connected?

The OPA544FKTTT uses a 5-lead DDPAK/TO-263 (KTT) surface-mount package with an exposed copper thermal tab. Per the manufacturer's connection diagrams and absolute maximum ratings, the tab is electrically connected to the V– supply pin (Pin 1). It must be soldered to a large PCB copper pour-minimum 4 in² recommended-to achieve low θ_JA and maintain junction temperature within limits. This direct V– tie simplifies grounding but mandates isolation of the heatsink plane from other system potentials.

Can the OPA544FKTTT operate with unbalanced power supplies?

Yes, the OPA544FKTTT supports unbalanced supplies-for example, –6V on V– and +30V on V+, yielding a total 36V rail span. This configuration ensures the inputs remain within their linear common-mode range (V_CM = (V–) +6V to (V+) –6V) and allows output swing to 0V. The datasheet confirms operation across any V+ to V– differential from ±10V to ±35V, provided the total supply voltage does not exceed 70V. However, short-circuit protection margin decreases at higher asymmetrical voltages due to increased V_CE stress.

What external components are required for stable operation of the OPA544FKTTT?

The OPA544FKTTT requires external output-stage compensation: a 1Ω resistor in series with a 0.01µF capacitor between VO and V– (or V+ depending on configuration), as shown in Figure 3 of the datasheet. Additionally, power supply bypassing with parallel 0.1µF ceramic and 10µF tantalum capacitors at each supply pin is mandatory. For reactive loads (motors, coils), clamp diodes (e.g., MUR420) from VO to V+ and V– are recommended to suppress inductive kickback and prevent output voltage overshoot beyond supply rails.