Texas Instruments OPA2277P

Overview

OPA2277P from Texas Instruments is a dual high-precision operational amplifier designed for low-drift, low-noise signal conditioning in industrial measurement systems. It delivers ±10 µV max input offset voltage, ±0.1 µV/°C max drift, 134 dB open-loop gain, 140 dB CMRR, and operates from ±2 V to ±18 V supplies - enabling stable performance in weigh scales, temperature transmitters, and precision data acquisition front-ends.

For engineers reviewing the OPA2277P datasheet, OPA2277P pinout, OPA2277P application, or OPA2277P equivalent, this page provides verified pin functions, real-world thermal metrics, channel separation behavior, trim-capable dual-channel architecture, and validated alternatives for legacy OP-177 replacement scenarios.

Technical Context

The OPA2277P implements a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors. Its dual-channel layout features fully independent circuitry - no shared bias networks or substrate coupling - ensuring <0.1 µV/V channel separation at DC and >100 dB up to 100 kHz.

It supports rail-to-rail output swing within ±1.5 V of rails (at 2 kΩ load) across –40°C to +85°C, with quiescent current tightly specified at ±790 µA per amplifier over ±5 V to ±15 V supply range - a single limit covering real-world dual-supply operation without derating.

Key Specifications

Pinout & Package

OPA2277P is packaged in an 8-pin PDIP (Plastic Dual In-line Package) with body size 6.35 mm × 9.81 mm. Pin 1 is marked by a notch or dot; leads are tin-lead plated per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2277P, OPA2189IDR offers superior drift performance at the cost of higher broadband noise and different EMI behavior, while AD8629ARZ trades CMRR and supply-voltage robustness for ultra-low input bias - making each suitable only in distinct precision subsystem contexts.

Availability

OPA2277P is available at Aetrix Electronics and suitable for analog input modules, weigh scales, and temperature transmitters requiring stable component supply across extended product lifecycles and industrial temperature ranges.

Supply support for OPA2277P 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 company specializing in analog and embedded processing technologies, with leadership in precision signal chain solutions.

The OPAx277 product line was engineered specifically for high-stability industrial measurement - replacing OP-177 with improved noise, wider output swing, and half the quiescent current while maintaining ultra-low offset and drift.

FAQ

What is the maximum operating supply voltage for OPA2277P?

The OPA2277P supports a total supply voltage (V+ to V–) of up to 36 V, corresponding to dual supplies of ±18 V. Absolute maximum ratings specify continuous operation up to this level, with recommended operating conditions spanning ±2 V to ±15 V - where all key parameters (offset, drift, CMRR) are fully guaranteed. Operation at ±18 V remains functional but may slightly reduce long-term reliability margin.

Does OPA2277P require external offset trim components?

No - the OPA2277P does not provide external offset trim pins. Only the single-channel OPA277 (not OPA2277P) includes pins 1 and 8 for offset adjustment. The OPA2277P uses laser trimming to achieve ±10 µV max input offset voltage at 25°C, and ±25 µV max over –40°C to +85°C, eliminating need for user trimming in most precision applications.

How does OPA2277P handle input overvoltage conditions?

The OPA2277P integrates 1-kΩ series input resistors and diode clamps on both inputs, allowing it to withstand ±30 V differential input voltage without damage. During overvoltage, the protection diodes conduct, which may temporarily affect slewing in unity-gain follower configurations - but no latch-up or permanent degradation occurs. This design enables robust interfacing with industrial sensors prone to cable-induced transients.

What is the channel separation performance of OPA2277P?

The OPA2277P achieves ≥100 dB channel separation up to 100 kHz, measured between Channel A and Channel B under G = 1, all channels active. At DC, separation exceeds 120 dB due to fully independent internal circuitry - no shared bias networks, substrates, or power routing. This isolation prevents crosstalk in dual-sensor systems such as differential pressure + temperature sensing on a single PCB.

Can OPA2277P drive capacitive loads without instability?

Yes - the OPA2277P is unity-gain stable and can safely drive up to 1500 pF capacitive load with minimal overshoot (<10%) and monotonic settling. Figure 6-19 in the datasheet confirms stable behavior at G = 1 with CL = 1500 pF. For loads exceeding this, a small series resistor (10–50 Ω) at the output is recommended to maintain phase margin without degrading DC accuracy.