Texas Instruments OPA547F/500G3

Overview

OPA547F/500G3 from Texas Instruments is a high-voltage, high-current operational amplifier designed for precision power amplification in demanding load-driving applications. It delivers ±500mA continuous output current, supports ±4V to ±30V dual supplies (or +8V to +60V single supply), features 6V/µs slew rate and adjustable current limiting from 0 to ±750mA via the ILIM pin - enabling use in valve drivers, programmable power supplies, and transducer excitation circuits.

For engineers reviewing the OPA547F/500G3 datasheet, OPA547F/500G3 pinout, OPA547F/500G3 application, or OPA547F/500G3 equivalent, key selection considerations include its thermal shutdown indicator (E/S pin), output disable capability with <1µs response, wide input common-mode range extending below ground in single-supply mode, and SOA-limited operation requiring heatsink design per θJA = 65°C/W (no heatsink) or θJC = 2–3°C/W (with heatsink).

Technical Context

The OPA547F/500G3 employs a laser-trimmed monolithic architecture delivering low input offset voltage (±1mV typ), high open-loop gain (100dB min), and excellent DC accuracy across –40°C to +85°C. Its internal protection includes thermal shutdown at ~160°C junction temperature and user-programmable current limiting via an indirect sensing scheme that accepts 0–150µA control current on the ILIM pin.

It integrates dual-function Enable/Status (E/S) logic: pulling E/S ≤ (V–) + 0.8V disables the output stage and reduces quiescent current to ±4mA, while monitoring E/S voltage (≥2.4V above V– normal / ≤0.8V during thermal shutdown) provides real-time status feedback without external sensors.

Key Specifications

Pinout & Package

The OPA547F/500G3 is packaged in a 7-lead DDPAK (TO-263) surface-mount package with electrically isolated copper tab for direct PCB thermal coupling. The tab is connected to the V– supply pin and must be soldered to ≥1 in² of 1oz copper for optimal θJA performance (≤30°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA547F/500G3, the OPA548T offers higher current headroom and extended voltage range while maintaining pin compatibility and feature parity, whereas the LM675T trades integrated protection and programmability for raw speed and peak current - necessitating additional discrete components for robust industrial deployment.

Availability

OPA547F/500G3 is available at Aetrix Electronics and suitable for industrial automation, programmable power supplies, and precision transducer excitation requiring stable component supply across long production lifecycles.

Supply support for OPA547F/500G3 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 OPA547F/500G3 belongs to TI's OPAxx high-current op-amp product line, engineered specifically for industrial actuation, programmable power, and precision excitation applications where reliability, thermal intelligence, and design simplicity are critical.

FAQ

What is the maximum continuous output current specification for the OPA547F/500G3?

The OPA547F/500G3 is rated for ±500mA continuous output current under specified thermal conditions (TCASE ≤ +85°C, proper heatsinking). This value is validated across the full operating temperature range and reflects sustained DC loading capability - not pulsed or peak current. Exceeding this limit risks activation of thermal shutdown or SOA violation, especially at higher supply voltages. The OPA547F/500G3 datasheet specifies derating curves based on VS–VO and ambient temperature.

How does the ILIM pin on the OPA547F/500G3 set the current limit?

The ILIM pin on the OPA547F/500G3 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 stage - connecting a resistor (e.g., 31.6kΩ) between ILIM and V– generates ~75µA, resulting in ~375mA limit. Unlike series-sense resistor methods, this indirect sensing avoids power loss and thermal drift. The OPA547F/500G3 equation is ILIM = (5000 × 4.75V)/(31.6kΩ + RCL).

Can the OPA547F/500G3 operate from a single supply, and what is the input common-mode range in that configuration?

Yes, the OPA547F/500G3 supports single-supply operation from +8V to +60V. In this mode, its input common-mode range extends to (V–) – 0.2V - meaning it accepts signals slightly below ground when V– is tied to 0V. This allows true rail-to-rail input capability for ground-referenced sensor interfaces or level-shifting applications. The OPA547F/500G3 maintains full functionality including current limiting and E/S status reporting in single-supply mode.

What thermal management is required for reliable operation of the OPA547F/500G3?

The OPA547F/500G3 requires active thermal management: its 7-lead DDPAK package has θJA = 65°C/W with no heatsink, dropping to ~30°C/W with ≥1 in² of 1oz copper. For continuous ±500mA operation at ±30V, junction temperature must stay ≤150°C - typically requiring a heatsink or large PCB copper area. The OPA547F/500G3 thermal shutdown activates at ~160°C, but sustained operation near this threshold degrades reliability. TI recommends designing for ≤125°C junction under worst-case ambient conditions.

Does the OPA547F/500G3 provide any built-in protection features beyond thermal shutdown?

Yes, the OPA547F/500G3 integrates multiple protection features: adjustable current limiting (0–750mA), output disable via E/S pin (reducing quiescent current to ±4mA), and thermal shutdown with status indication on the same E/S pin. It also includes internal circuitry to prevent latch-up and withstand absolute maximum ratings such as 60V supply differential. However, external clamp diodes are recommended for inductive loads to prevent output voltage overshoot beyond supply rails - a condition not covered by internal protection.