Texas Instruments OPA197ID

Overview

OPA197ID from Texas Instruments is a precision 36-V rail-to-rail input/output operational amplifier optimized for high-voltage industrial signal conditioning. It delivers ±100 µV max offset voltage, 10-MHz gain-bandwidth, 20 V/µs slew rate, and ±65 mA output drive-enabling accurate sensor interfacing in multiplexed data-acquisition systems, high-side current sensing, and SAR ADC reference buffering.

For engineers reviewing the OPA197ID datasheet, OPA197ID pinout, OPA197ID application, or OPA197ID equivalent, key selection criteria include its differential input voltage range to supply rail, EMI-filtered inputs, 120 dB minimum CMRR, and robust 1 nF capacitive load drive capability in SOIC-8 packaging.

Technical Context

The OPA197ID employs a proprietary input stage enabling rail-to-rail common-mode operation-including beyond the positive rail (V+ − 1.5 V) and down to V− − 0.1 V-while maintaining low bias current (±5 pA typical) and ultra-low drift (±2.5 µV/°C max). Its 10-MHz GBW and 20 V/µs slew rate support fast settling (1.4 µs to 0.01%) in precision closed-loop configurations.

Thermal protection activates at 140°C junction temperature, and the device sustains ±65 mA short-circuit output current per amplifier under ±18 V supplies. Input voltage noise is 5.5 nV/√Hz at 1 kHz, with 0.1–10 Hz noise of 1.3 µVPP-critical for low-frequency sensor amplification without post-processing filtering.

Key Specifications

Pinout & Package

OPA197ID is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.90 mm body size, with exposed pad not present. Pin functions are validated per TI SBOS737C Rev C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA192ID and AD8676ARZ, the OPA197ID uniquely combines EMI filtering, extended CM range, and 36-V operation-making it the only option qualified for unshielded high-voltage multiplexed DAQ in factory automation.

Availability

OPA197ID is available at Aetrix Electronics and suitable for high-voltage data acquisition, precision current sensing, and industrial ADC driver applications requiring stable component supply across extended temperature ranges (−40°C to +125°C).

Supply support for OPA197ID 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 amplifiers and industrial interface solutions.

The OPA197ID belongs to TI's OPAx197 family-designed specifically for high-voltage, high-precision industrial signal chains where rail-to-rail operation, EMI resilience, and robust output drive are mandatory.

FAQ

What is the maximum supply voltage rating for the OPA197ID?

The OPA197ID supports a maximum supply voltage of ±20 V in dual-supply mode or 40 V in single-supply mode, as specified in Absolute Maximum Ratings. For reliable operation, TI recommends staying within ±18 V dual or +36 V single supply per Recommended Operating Conditions-ensuring long-term reliability and thermal margin. Exceeding these limits risks permanent damage to the OPA197ID.

Does the OPA197ID support rail-to-rail output swing under heavy load?

Yes, the OPA197ID achieves rail-to-rail output swing with ≤25 mV headroom from each rail under no-load conditions. At 10-kΩ load, output swing is within 125 mV of both rails; at 2-kΩ, it remains within 500 mV. This behavior is verified across −40°C to +125°C and enables direct interfacing with 16-bit ADCs like the ADS8864 without level-shifting circuitry in the OPA197ID signal path.

Can the OPA197ID drive a 1-nF capacitive load stably?

Yes, the OPA197ID is explicitly characterized for stable operation with up to 1-nF capacitive loads, as confirmed in TI's SBOS737C datasheet Figure 27–28. No external isolation resistor is required-unlike many precision op-amps-making it ideal for driving ADC input capacitors, long cables, or piezoelectric sensors directly. Stability is maintained across all supply voltages and temperatures for the OPA197ID.

What is the input bias current specification for the OPA197ID at 125°C?

The OPA197ID exhibits ±5 pA typical input bias current at 25°C, and this increases to ±5 nA maximum over the full −40°C to +125°C operating range, per Electrical Characteristics Table 6.7. This ultra-low bias current ensures minimal error in high-impedance sensor interfaces-such as thermocouples or photodiode transimpedance stages-where even nanoampere leakage would degrade accuracy in the OPA197ID circuit.

Is thermal shutdown active in the OPA197ID, and at what temperature does it trigger?

Yes, the OPA197ID incorporates thermal shutdown protection that activates at 140°C junction temperature, as documented in Section 6.7 and Section 6.8 of the datasheet. The device automatically disables output and recovers once junction temperature falls below the hysteresis threshold. This feature protects the OPA197ID during sustained overload, poor heatsinking, or ambient temperature excursions-ensuring safe operation in sealed industrial enclosures.