Texas Instruments OPA2180ID

Overview

OPA2180ID from Texas Instruments is a dual-channel, zero-drift, rail-to-rail output operational amplifier optimized for precision DC-coupled signal conditioning in industrial and test equipment. It delivers 75 μV maximum input offset voltage, 0.1 μV/°C drift, 10 nV/√Hz input voltage noise at 1 kHz, 120 dB open-loop gain, and operates from ±2 V to ±18 V supplies. It is used in bridge amplifier circuits for strain gauge readout where long-term stability and low 1/f noise are critical.

For engineers reviewing the OPA2180ID datasheet, OPA2180ID pinout, OPA2180ID application, or OPA2180ID equivalent, key selection criteria include its guaranteed 0.1 μV/°C drift over –40°C to +105°C, rail-to-rail output swing within 250 mV of rails at 10 kΩ load, and validated performance in transducer front-ends requiring sub-μV-level DC accuracy without calibration.

Technical Context

The OPA2180ID uses TI's proprietary auto-zeroing architecture with chopper-stabilized input stage and notch-filtered correction path to eliminate offset and drift while minimizing switching artifacts. Its dual-channel layout shares no internal bias or reference coupling, ensuring >100 dB channel separation up to 100 kHz.

It features RFI-filtered inputs, input common-mode range extending to the negative rail, and stable operation with capacitive loads up to 1 nF-enabling direct interface with ADC drivers and sensor buffers without external isolation components.

Key Specifications

Pinout & Package

The OPA2180ID is packaged in an 8-pin SOIC (D) package with 4.90 mm × 3.91 mm body size and standard 1.27 mm pitch. This surface-mount package supports automated assembly and provides thermal resistance (R_θJA) of 111°C/W for reliable operation in compact industrial enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2180ID, OPA2188ID trades higher power for tighter DC specs, while LTC2057HS8#PBF offers lower drift but requires external stability components and delivers less output swing - making OPA2180ID the optimal balance of precision, integration, and ease of use in industrial sensor interfaces.

Availability

OPA2180ID is available at Aetrix Electronics and suitable for bridge amplifiers, strain gauge interfaces, and electronic scale front-ends requiring stable component supply with guaranteed long-term parametric consistency and full traceability.

Supply support for OPA2180ID 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 signal-chain solutions.

The OPAx180 family was designed specifically for high-accuracy, low-drift industrial measurement systems - targeting applications where sensor signal integrity, thermal stability, and long-term reliability outweigh raw speed or ultra-low power.

FAQ

What is the operating temperature range for the OPA2180ID?

The OPA2180ID is specified for operation from –40°C to +105°C. This range is validated across all key parameters including input offset voltage drift (0.1 μV/°C), open-loop gain (120 dB), and output swing (250 mV from rail). The device maintains full functionality and guaranteed specifications throughout this industrial temperature envelope, making it suitable for deployment in harsh environments such as factory automation controllers and outdoor instrumentation.

Does the OPA2180ID support single-supply operation?

Yes, the OPA2180ID supports true single-supply operation from 4.5 V to 36 V. Its input common-mode range extends to the negative rail (V–), and its rail-to-rail output swings within 250 mV of both supply rails at 10 kΩ load. This allows direct interfacing with microcontrollers and ADCs operating on 3.3 V or 5 V supplies without level-shifting circuitry - a key enabler for compact, low-cost sensor signal chains using the OPA2180ID.

How does the zero-drift architecture of the OPA2180ID reduce system calibration needs?

The OPA2180ID's auto-zeroing architecture achieves 0.1 μV/°C input offset drift, limiting total drift to under 1 μV across a 100°C ambient range. In a typical 100 mV full-scale bridge amplifier application, this translates to <0.001% gain-independent error - eliminating the need for periodic hardware or software calibration in field-deployed equipment. This behavior is confirmed by 1000-hour life testing showing only ~4 μV variation, directly reducing maintenance burden in OPA2180ID-based systems.

Can the OPA2180ID drive capacitive loads without instability?

Yes, the OPA2180ID is characterized to drive capacitive loads up to 1 nF while maintaining phase margin >45° and monotonic step response. This capability is verified in the datasheet's Typical Characteristics section (Figures 10–11) and enables direct connection to sampling ADC inputs, shielded cables, or piezoelectric sensor elements without external isolation resistors. The internal compensation ensures stable operation even when the OPA2180ID output sees significant parasitic capacitance in PCB layout or cabling.

What is the significance of RFI-filtered inputs in the OPA2180ID?

The OPA2180ID integrates RFI filtering on both inputs to attenuate high-frequency electromagnetic interference above 10 MHz by >20 dB. This eliminates the need for external RC filters in EN 55022/IEC 61000-4-3 compliant designs - reducing BOM count, PCB area, and potential phase-shift errors. In real-world applications like motor-drive adjacent instrumentation, this feature prevents rectified RF noise from corrupting DC sensor outputs, preserving the integrity of measurements made with the OPA2180ID.