Texas Instruments OPA177GP

Overview

OPA177GP from Texas Instruments is a precision bipolar operational amplifier optimized for low-offset, low-drift, low-noise instrumentation applications. It delivers 25 µV max input offset voltage, 0.3 µV/°C max offset drift, and 134 dB min open-loop gain, operating from ±3 V to ±18 V dual supply (6–36 V single). It serves as a direct replacement for OP-07, OP-77, and AD707 in high-stability analog front-ends for data acquisition and temperature sensing.

For engineers reviewing the OPA177GP datasheet, OPA177GP pinout, OPA177GP application, or OPA177GP equivalent, key selection criteria include its laser-trimmed offset stability over temperature, internal input bias current cancellation eliminating external balancing resistors, and compatibility with ±13.5 V output swing into 2 kΩ loads at 25°C - critical for precision sensor signal conditioning and lab-grade measurement circuits.

Technical Context

The OPA177GP uses a laser-trimmed bipolar input stage with integrated input bias current cancellation, reducing residual IB to ±2 nA (max) and enabling direct connection without external compensation resistors. Its architecture achieves ultra-low 100 nV/√Hz input voltage noise density at 1 kHz and 85 nV_RMS (0.1–100 Hz), supporting high-resolution DC-coupled measurements.

It features unity-gain stability, 0.6 MHz closed-loop bandwidth (G = 1), and robust ±30 V differential input rating with on-chip 500 Ω series resistors and diode clamps. Thermal design considerations include warm-up drift mitigation via 1.3 mA typical quiescent current and sensitivity to thermoelectric potentials at inputs - requiring matched thermal paths for IN+ and IN− traces.

Key Specifications

Pinout & Package

OPA177GP is supplied in an 8-pin plastic DIP (PDIP) package measuring 9.81 mm × 9.43 mm, with through-hole mounting and industry-standard pin spacing. The package includes no internal connection at Pin 5 and dual offset trim terminals (Pins 1 and 8) for fine calibration when required.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision operational amplifier applications.

Compared with OPA177GP, OPA277GP trades lower cost for higher drift and reduced loop gain, while AD707KPZ offers tighter initial offset but demands more complex layout and higher power - making OPA177GP the balanced choice for new designs prioritizing long-term stability and ease of implementation.

Availability

OPA177GP is available at Aetrix Electronics and suitable for analog input modules, data acquisition systems, and temperature transmitters requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for OPA177GP 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 leadership in precision op amp design and manufacturing.

The OPA177GP belongs to TI's precision bipolar op amp product line, engineered specifically for high-accuracy, low-drift instrumentation applications where laser-trimmed performance and thermal stability outweigh FET-input noise advantages.

FAQ

What is the maximum operating temperature range for the OPA177GP?

The OPA177GP is rated for operation from –40°C to +85°C ambient temperature. This range is validated per TI's Recommended Operating Conditions and supported by electrical specifications including ±40 µV max input offset voltage and ±0.3 µV/°C max drift across the full span. The device's thermal resistance (R_θJA) is 100.0°C/W in the PDIP package, enabling reliable performance in enclosed industrial enclosures without forced airflow.

Does the OPA177GP require external components for input bias current cancellation?

No, the OPA177GP does not require external components for input bias current cancellation. Its internal architecture provides active base-current cancellation, resulting in a residual input bias current of ±2 nA (max) and eliminating the need for matching resistors at the inputs. Adding external balancing resistors can actually increase offset and noise - TI explicitly advises against this practice in the datasheet's Application Information section.

Can the OPA177GP be used in single-supply configurations?

Yes, the OPA177GP supports single-supply operation from 6 V to 36 V. Its input common-mode voltage range extends to within 1.5 V of the negative rail and 1.5 V of the positive rail (±13 V with ±15 V supplies), and output swing reaches ±13.5 V into 2 kΩ. For true single-supply use (e.g., 5 V or 12 V), ensure input signals remain within the specified common-mode range and consider rail-splitting or level-shifting techniques to maintain linear operation.

What is the purpose of Pins 1 and 8 on the OPA177GP?

Pins 1 and 8 on the OPA177GP are offset trim terminals, designed for optional external adjustment of input offset voltage using a 20 kΩ potentiometer. The trim range is approximately ±3 mV. These pins should be left unconnected if not used - they are not required for standard operation, as the device is laser-trimmed to ±25 µV max offset. TI cautions against using this adjustment to compensate for system-level errors, as it may introduce additional temperature drift.

How does the OPA177GP compare to chopper-stabilized amplifiers in precision applications?

The OPA177GP provides an effective alternative to chopper-stabilized amplifiers by delivering ultra-low offset and drift without switching artifacts or 1/f noise modulation. Unlike choppers, it exhibits smooth frequency response up to 0.6 MHz and no charge injection or clock feedthrough - making it preferable in sensitive analog front-ends for audio-grade instrumentation and low-noise sensor interfaces where spectral purity matters. Its 85 nV_RMS (0.1–100 Hz) noise is competitive with many chopper designs while avoiding their complexity.