Texas Instruments OPA547T-1G3

Overview

OPA547T-1G3 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 requiring robust thermal protection and output disable capability.

For engineers reviewing the OPA547T-1G3 datasheet, OPA547T-1G3 pinout, OPA547T-1G3 application, or OPA547T-1G3 equivalent, key selection criteria include its 6V/µs slew rate, ±1mV input offset voltage, thermal shutdown indicator on E/S pin, user-programmable current limit without series power resistors, and TO-220 package with electrically isolated tab for heatsink mounting.

Technical Context

The OPA547T-1G3 integrates laser-trimmed monolithic circuitry for low-level signal accuracy while sustaining high output voltage swing (e.g., (V+) – 1.9V at ±500mA) and full rail-to-rail input common-mode range extending below ground in single-supply mode. Its internal architecture includes indirect load current sensing-enabling precise 0–750mA current limit control via 0–150µA ILIM pin current-eliminating need for power-dissipating series sense resistors.

It implements dual-function Enable/Status (E/S) logic: pulling E/S ≤ (V–) + 0.8V disables output and reduces quiescent current to ±4mA; monitoring E/S voltage (≥2.4V normal, ≤0.8V during thermal shutdown) provides real-time junction temperature status. Thermal protection activates at ~160°C and resets at ~140°C, with θ_JC = 3°C/W (dc) in TO-220 package.

Key Specifications

Pinout & Package

The OPA547T-1G3 is housed in a 7-lead TO-220 (KVT) package with copper tab electrically connected to V–; tab must be mounted to heatsink or PCB copper for thermal management (θ_JA = 65°C/W unheatsinked).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA547T-1G3, OPA548T offers higher current headroom and extended voltage range but increases thermal design complexity, while LM675T sacrifices precision, programmability, and integrated protection - making OPA547T-1G3 optimal for applications requiring accurate, field-configurable current limiting and real-time thermal diagnostics in compact industrial packages.

Availability

OPA547T-1G3 is available at Aetrix Electronics and suitable for valve drivers, servo amplifiers, and programmable power supplies requiring stable component supply, long-term industrial temperature support (–40°C to +85°C), and traceable sourcing from Texas Instruments' production line.

Supply support for OPA547T-1G3 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-1G3 belongs to TI's high-voltage, high-current operational amplifier product line, engineered specifically for industrial motion control, programmable power, and ruggedized test instrumentation where reliability, thermal intelligence, and programmable protection are critical.

FAQ

What is the maximum continuous output current of the OPA547T-1G3?

The OPA547T-1G3 delivers ±500mA continuous output current under specified thermal conditions (TCASE ≤ +85°C, proper heatsinking). This rating applies across its full operating temperature range (–40°C to +85°C) and is validated per the Safe Operating Area curve in the datasheet. Peak current capability reaches ±750mA when current-limited via the ILIM pin, but sustained operation above ±500mA requires careful thermal design to avoid triggering thermal shutdown. The OPA547T-1G3 achieves this performance in its 7-lead TO-220 package with θ_JC = 3°C/W.

How does the ILIM pin on the OPA547T-1G3 set the current limit?

The ILIM pin on the OPA547T-1G3 accepts a control current from 0µA to 150µA to set the output current limit between 0mA and ±750mA. This is implemented via an internal transconductance circuit - no external power resistor is placed in the output path. A standard method uses a resistor (e.g., 31.6kΩ) between ILIM and V–, yielding ±375mA; lower resistance increases limit. Alternatively, a DAC can drive ILIM directly. The OPA547T-1G3's indirect sensing avoids power loss and thermal drift issues associated with traditional shunt-based limiting.

Can the OPA547T-1G3 operate from a single supply, and what is the input common-mode range?

Yes, the OPA547T-1G3 operates from a single supply ranging from +8V to +60V. Its input common-mode voltage range extends from (V–) – 0.2V to (V+) – 2.3V, meaning it accepts inputs below ground (e.g., –0.2V referenced to V–) in single-supply configurations. This enables true ground-referenced signal processing without level-shifting circuitry. The OPA547T-1G3 maintains full functionality - including current limiting and E/S status - across this supply range, making it ideal for industrial sensors and actuators powered from unipolar rails.

What function does the E/S pin serve on the OPA547T-1G3?

The E/S (Enable/Status) pin on the OPA547T-1G3 serves two distinct, simultaneous functions: (1) as an input to disable the output stage (pulling E/S ≤ (V–) + 0.8V reduces quiescent current to ±4mA), and (2) as an output that indicates thermal shutdown (voltage drops to ≤0.8V above V– when junction temperature exceeds ~160°C). This dual-role pin eliminates need for separate control and monitoring lines, simplifying system integration in space-constrained industrial designs using the OPA547T-1G3.

What package type and thermal characteristics apply to the OPA547T-1G3?

The OPA547T-1G3 uses a 7-lead TO-220 (KVT) package with the copper tab electrically connected to the V– pin. Its thermal resistance is θ_JC = 3°C/W (dc) and θ_JA = 65°C/W (no heatsink). For reliable operation, the tab must be mounted to a heatsink or large PCB copper area; TI recommends soldering the tab directly to ≥1 in² of 1oz copper for θ_JA ≈ 40°C/W. The OPA547T-1G3 is rated for –40°C to +85°C ambient operation, with junction temperature limited to 150°C for long-term reliability.