Texas Instruments OPA547TG3

Overview

OPA547TG3 from Texas Instruments is a high-voltage, high-current operational amplifier designed for precision power drive applications. 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/actuator drivers, servo systems, and programmable power supplies requiring robust output stage control and thermal protection.

For engineers reviewing the OPA547TG3 datasheet, OPA547TG3 pinout, OPA547TG3 application, or OPA547TG3 equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional trade-offs for industrial power op-amp selection.

Technical Context

The OPA547TG3 integrates laser-trimmed monolithic circuitry for low input offset voltage (±1mV typ) and high open-loop gain (100dB min), enabling accurate signal amplification under heavy load conditions. Its internal architecture supports both single- and dual-supply operation with rail-to-rail input common-mode range extending below ground.

Thermal shutdown activates at 160°C junction temperature and resets at 140°C, while the Enable/Status (E/S) pin serves dual roles: disabling the output stage (reducing quiescent current to ±4mA) and reporting thermal shutdown status via voltage-level shift (3.5V → 0.35V above V–). Current limiting is implemented via indirect load sensing-eliminating series power resistors-and is controlled by a 0–150µA signal into the ILIM pin.

Key Specifications

Pinout & Package

The OPA547TG3 is supplied in a 7-lead TO-220 (KVT) package with copper tab electrically connected to V–, enabling direct mechanical and thermal mounting to heatsinks or PCB copper planes. The staggered lead form factor supports through-hole assembly and high-power dissipation (θ_JA = 65°C/W, no heatsink).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA547TG3, OPA548T offers higher output current but lacks integrated current limit control and thermal status reporting, while LM675T provides greater raw power but omits critical diagnostics and precision current setting-making OPA547TG3 uniquely balanced for industrial control loops requiring both accuracy and supervisory intelligence.

Availability

OPA547TG3 is available at Aetrix Electronics and suitable for valve drivers, servo amplifiers, programmable power supplies, and transducer excitation systems requiring stable component supply with long-term industrial lifecycle support.

Supply support for OPA547TG3 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 OPA547TG3 belongs to TI's high-voltage, high-current operational amplifier product line, engineered specifically for industrial actuation, motion control, and programmable power systems demanding reliability, thermal intelligence, and configurable output protection.

FAQ

What is the maximum continuous output current of the OPA547TG3?

The OPA547TG3 delivers ±500mA continuous output current under specified thermal conditions (TCASE ≤ +85°C, adequate 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 official SBOS056F datasheet. Peak current capability reaches ±750mA when configured via the ILIM pin, but sustained operation above ±500mA requires careful thermal design to avoid activation of the 160°C thermal shutdown circuit.

How does the ILIM pin adjust current limit on the OPA547TG3?

The ILIM pin on the OPA547TG3 accepts a 0–150µA control current to set the output current limit between 0 and ±750mA. This is implemented via an internal transconductance stage that avoids series power resistors. A standard resistor (e.g., 31.6kΩ for ±375mA) between ILIM and V– generates the required current; alternatively, a DAC can drive ILIM directly. The relationship follows ILIM = (5000 × 4.75V) / (31.6kΩ + RCL), as defined in the OPA547TG3 datasheet.

Can the OPA547TG3 operate from a single supply?

Yes, the OPA547TG3 supports single-supply operation from +8V to +60V. Its input common-mode range extends below ground (to V– – 0.1V), enabling true ground-referenced inputs even with single-ended supplies. This allows use in applications such as 24V industrial controllers driving 0–10V analog outputs or 4–20mA loops without level-shifting circuitry - provided the V– pin is tied to system ground and appropriate decoupling is applied to V+.

What function does the E/S pin serve on the OPA547TG3?

The E/S (Enable/Status) pin on the OPA547TG3 provides dual functionality: as an input, pulling it ≤(V–)+0.8V disables the output stage and reduces quiescent current to ±4mA; as an output, it reports thermal shutdown status by dropping from ~3.5V to ~0.35V above V– when junction temperature exceeds 160°C. Both functions operate simultaneously, enabling compact fault-aware designs without additional supervision ICs.

Which package type is used by the OPA547TG3?

The OPA547TG3 uses a 7-lead TO-220 (KVT) package with staggered leads and an electrically connected copper tab tied to the V– pin. This through-hole package supports high thermal dissipation (θ_JA = 65°C/W unheatsinked) and is rated for industrial temperature operation (–40°C to +85°C). It is distinct from the surface-mount OPA547F/DDPAK variant and is optimized for manual or wave-solder assembly in high-reliability power applications.