Texas Instruments OPA547T-1

Overview

OPA547T-1 from Texas Instruments is a high-voltage, high-current operational amplifier designed for precision power amplification in demanding industrial loads. It delivers ±500mA continuous output current, operates from ±4V to ±30V dual supplies (or +8V to +60V single supply), and features adjustable current limiting (0–750mA) via the ILIM pin. It is used in valve drivers, servo systems, and programmable power supplies where robust output drive and thermal protection are critical.

For engineers reviewing the OPA547T-1 datasheet, OPA547T-1 pinout, OPA547T-1 application, or OPA547T-1 equivalent, key selection considerations include its 6V/µs slew rate, ±5mV input offset voltage, thermal shutdown indicator on the E/S pin, user-configurable current limit without series power resistors, and TO-220 (KC) package with electrically isolated tab tied to V–.

Technical Context

The OPA547T-1 implements a laser-trimmed monolithic op-amp architecture with integrated thermal shutdown and indirect current-sensing circuitry. Its E/S pin provides dual functionality: active-low output disable (reducing quiescent current to ±4mA) and open-drain thermal status indication (sinking 5µA when junction temperature exceeds 160°C).

Current limiting is set by an external resistor (R_CL) between ILIM and V–, enabling precise 0–750mA range control using the equation I_LIM = (5000 × 4.75)/(31.6kΩ + R_CL). Input common-mode range extends to (V–) – 0.2V, supporting single-supply operation with ground-referenced inputs.

Key Specifications

Pinout & Package

The OPA547T-1 is housed in a 7-lead TO-220 (KC) package with straight-formed leads and copper tab electrically connected to V–. The tab enables direct mounting to heatsinks or PCB copper planes for low θ_JA (65°C/W, no heatsink) and θ_JC (3°C/W, DC).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current operational amplifier applications.

Compared with OPA547T-1, OPA548T offers higher current headroom and extended voltage range while maintaining pin compatibility and feature parity; LM675T provides raw output power at lower cost but sacrifices precision, programmability, and integrated diagnostics essential for industrial control loops.

Availability

OPA547T-1 is available at Aetrix Electronics and suitable for valve drivers, servo amplifiers, and programmable power supplies requiring stable component supply across extended industrial temperature ranges (–40°C to +85°C).

Supply support for OPA547T-1 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 is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and power management ICs.

The OPA547T-1 belongs to TI's high-voltage, high-current op-amp product line, engineered for industrial motion control, test equipment, and programmable power applications demanding robustness, accuracy, and integrated protection.

FAQ

What is the maximum continuous output current of the OPA547T-1?

The OPA547T-1 delivers ±500mA continuous output current under specified thermal conditions. This rating assumes proper heatsinking and operation within the safe operating area (SOA) curve - at higher case temperatures or elevated supply voltages, the safe current decreases to prevent thermal shutdown. The OPA547T-1 also supports up to ±750mA peak current with appropriate derating.

How does the ILIM pin on the OPA547T-1 set the current limit?

The ILIM pin on the OPA547T-1 accepts a 0–150µA control current to set the output current limit from 0 to ±750mA. This is typically implemented with a resistor (R_CL) between ILIM and V–, using the formula I_LIM = (5000 × 4.75)/(31.6kΩ + R_CL). Unlike conventional designs, the OPA547T-1 senses load current indirectly, avoiding power loss and heating in a series sense resistor.

Can the OPA547T-1 operate from a single supply?

Yes, the OPA547T-1 supports single-supply operation from +8V to +60V. Its input common-mode range extends to (V–) – 0.2V, allowing ground-referenced inputs even when V– is connected to system ground. For optimal performance, bypass V+ and V– with 0.1µF ceramic and 10µF tantalum capacitors close to the package pins.

What is the function of the E/S pin on the OPA547T-1?

The E/S (Enable/Status) pin on the OPA547T-1 serves two independent functions: pulling it low (< V– + 0.8V) disables the output stage and reduces quiescent current to ±4mA; monitoring its voltage reveals thermal status - ≈3.5V above V– indicates normal operation, while ≈0.35V above V– signals thermal shutdown. Both functions can be used simultaneously.

What package type is used for the OPA547T-1?

The OPA547T-1 uses a 7-lead TO-220 (KC) package with straight-formed leads and an exposed copper tab electrically connected to the V– pin. This mechanical configuration enables direct mounting to heatsinks or large PCB copper areas for efficient thermal dissipation, achieving θ_JA = 65°C/W (no heatsink) and θ_JC = 3°C/W (DC).