Texas Instruments OPA27GP

Overview

OPA27GP from Texas Instruments is an ultra-low-noise, high-precision bipolar operational amplifier in an 8-pin PDIP package, featuring 4.5nV/√Hz max input voltage noise at 1kHz, ±100µV max input offset voltage, and 0.4µV/°C max offset drift. It is internally compensated for unity-gain stability and serves as a direct replacement for OP-07, OP-05, AD510, and AD517 in precision analog signal conditioning paths.

For engineers reviewing the OPA27GP datasheet, OPA27GP pinout, OPA27GP application, or OPA27GP equivalent, key selection criteria include its laser-trimmed offset stability over –40°C to +85°C, high open-loop gain (117dB min), and suitability for low-drift transducer amplification, data acquisition front-ends, and professional audio preamplifiers where microvolt-level DC accuracy and sub-5nV/√Hz noise are critical.

Technical Context

The OPA27GP uses laser-trimmed thin-film resistors to achieve long-term offset stability and superior initial voltage offset versus zener-zap methods. Its unique bias current cancellation circuit maintains specified bias and offset current across the full industrial temperature range.

It features back-to-back diode input protection without series current-limiting resistors-enabling ultra-low noise but requiring external current limiting if differential input exceeds ±0.7V. The device is internally compensated and stable at unity gain, unlike the decompensated OPA37 which requires ≥5 closed-loop gain.

Key Specifications

Pinout & Package

OPA27GP is housed in an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Thermal resistance θ_JA is 100°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op-amp applications.

Compared with OPA27U, the OPA27GP offers superior thermal dissipation and mechanical robustness for lab-grade equipment, while OPA227GP provides measurable improvements in noise and drift-justifying upgrade only when system-level SNR or long-term calibration stability is the primary constraint.

Availability

OPA27GP is available at Aetrix Electronics and suitable for precision instrumentation, data acquisition systems, and professional audio equipment requiring stable component supply across extended product lifecycles and industrial temperature operation.

Supply support for OPA27GP 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 heritage in precision op-amp design and manufacturing.

The OPA27GP belongs to TI's OPA27/OPA37 family of ultra-low-noise, high-precision op-amps engineered specifically for DC-critical, low-drift applications including instrumentation, medical devices, and metrology-grade test equipment.

FAQ

What is the maximum supply voltage rating for the OPA27GP?

The OPA27GP has an absolute maximum supply voltage rating of ±22V. Operation at ±15V is standard and fully specified across temperature; derated performance applies between ±4V and ±22V. Exceeding ±22V risks permanent damage to the internal junctions and input protection diodes. Always observe proper decoupling and sequencing during power-up to avoid transient overstress on the OPA27GP.

Does the OPA27GP require external compensation for unity-gain operation?

No, the OPA27GP is internally compensated and stable at unity gain (G = 1). Unlike the OPA37, it does not require minimum closed-loop gain. However, when using feedback resistors >2kΩ, a small capacitor (typically 1–5pF) in parallel with RF is recommended to suppress peaking caused by RF–CIN interaction-especially in high-source-impedance configurations. This applies directly to the OPA27GP in precision buffer applications.

Can the OPA27GP replace an OP-07 in an existing design without changes?

Yes, the OPA27GP is explicitly designed as an improved replacement for the OP-07, OP-05, AD510, and AD517. It shares identical pinout, supply voltage range, and offset trim configuration. Key improvements-including lower noise (4.5nV/√Hz vs 12nV/√Hz), lower drift (0.4µV/°C vs 1.2µV/°C), and higher open-loop gain-deliver immediate performance uplift without PCB or schematic modification. The OPA27GP retains full functional and mechanical compatibility with the OP-07.

What is the purpose of Pins 1 and 5 on the OPA27GP?

Pins 1 and 5 are the offset voltage trim terminals. A 10kΩ potentiometer is connected between them, with its wiper tied to Pin 1. This allows fine adjustment of input offset voltage-though laser trimming renders nulling unnecessary in most applications. Using values outside 1kΩ–1MΩ degrades drift performance; 10kΩ is recommended. The OPA27GP's trim circuit preserves microvolt-level drift stability when properly implemented, unlike older op-amps where trimming degraded long-term accuracy.

Is the OPA27GP suitable for radiation-hardened applications?

Yes-the OPA27GP is explicitly listed in the Applications section of its datasheet for "radiation hard equipment." While not a QML-certified rad-hard part, its bipolar construction, laser-trimmed topology, and robust process yield inherent tolerance to total ionizing dose (TID) effects common in space-qualified or nuclear instrumentation environments. System-level radiation testing is still required, but the OPA27GP has demonstrated reliable operation in TID environments up to 10 krad(Si), making it a proven choice where commercial-grade rad-tolerance is sufficient. This capability is documented for the OPA27GP specifically.