Texas Instruments OPA197IDGKT

Overview

OPA197IDGKT from Texas Instruments is a precision 36-V rail-to-rail input/output operational amplifier optimized for high-voltage, multiplexed data-acquisition systems. It delivers ±100 µV max input offset voltage, 10-MHz gain-bandwidth, 20 V/µs slew rate, and rail-to-rail operation across ±2.25 V to ±18 V supplies - enabling accurate signal conditioning in industrial PLCs and high-side current sensing.

For engineers reviewing the OPA197IDGKT datasheet, OPA197IDGKT pinout, OPA197IDGKT application, or OPA197IDGKT equivalent, key selection criteria include its differential input voltage range to supply rails, ±65 mA output drive, 1 nF capacitive load capability, EMI-filtered inputs, and operation over –40°C to +125°C for rugged industrial deployment.

Technical Context

The OPA197IDGKT employs a robust input stage supporting common-mode voltages extending to both supply rails, eliminating phase reversal under overdrive and enabling direct interfacing with high-voltage multiplexers and bridge sensors. Its low 5.5 nV/√Hz noise at 1 kHz and 120 dB minimum CMRR ensure integrity in precision ADC driver and reference buffer roles.

It features internal thermal protection (trip at 140°C), ±5 pA typical input bias current, and stable unity-gain operation into ≥1 nF loads - making it suitable for SAR ADC front-ends, programmable gain stages, and high-precision comparator circuits without external compensation.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, thin-profile surface-mount design optimized for space-constrained industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA197IDGKT, OPA192IDBVT trades input rail-to-rail capability for superior drift performance in compact SOT-23, while AD8676ARMZ delivers higher DC precision at the cost of voltage range and input flexibility - making OPA197IDGKT the optimal balance for industrial multiplexed acquisition with wide supply and robustness requirements.

Availability

OPA197IDGKT is available at Aetrix Electronics and suitable for multiplexed data-acquisition systems, high-side current sensing, and SAR ADC reference buffering requiring stable component supply across extended temperature and voltage ranges.

Supply support for OPA197IDGKT 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 focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability components.

The OPA197IDGKT belongs to TI's precision op-amp portfolio designed specifically for high-voltage, high-accuracy signal conditioning in harsh industrial environments - emphasizing rail-to-rail operation, EMI resilience, and thermal robustness.

FAQ

What is the maximum supply voltage for OPA197IDGKT?

The OPA197IDGKT supports dual supplies up to ±18 V or single supply up to +36 V. Absolute maximum ratings specify ±20 V dual or 40 V single - but continuous operation above ±18 V or +36 V risks permanent damage. Designers should maintain recommended operating conditions (±2.25 V to ±18 V or +4.5 V to +36 V) for guaranteed performance and reliability across the full –40°C to +125°C range.

Does OPA197IDGKT support rail-to-rail input beyond the supply rails?

Yes - the OPA197IDGKT allows differential input voltages up to (V+) – (V–) + 0.2 V and common-mode voltages from (V–) – 0.5 V to (V+) + 0.5 V. This enables true rail-to-rail input operation and tolerance of brief overvoltage transients, a key advantage over standard RRIO op-amps. The feature prevents phase reversal during multiplexer switching or sensor fault conditions, ensuring predictable behavior in safety-critical industrial nodes.

Can OPA197IDGKT drive a 1-nF capacitive load without oscillation?

Yes - the OPA197IDGKT is specified to drive up to 1 nF capacitive loads stably in unity-gain configuration, as verified in TI's Typical Characteristics (Figure 27–28). This eliminates the need for series isolation resistors when driving ADC inputs, sample-and-hold circuits, or long cables. For loads >1 nF, a small series resistor (e.g., 10–50 Ω) at the output is recommended to maintain phase margin.

What is the thermal shutdown threshold for OPA197IDGKT?

The OPA197IDGKT incorporates thermal protection that activates at approximately 140°C junction temperature. When triggered, the amplifier shuts down output stage conduction to prevent damage; it automatically recovers once junction temperature falls below the hysteresis threshold (~125°C). This feature protects the device during sustained overload, poor PCB thermal design, or ambient temperature excursions - critical for unattended industrial deployments.

Is OPA197IDGKT pin-compatible with other members of the OPAx197 family?

No - OPA197IDGKT (single, VSSOP-8) is not pin-compatible with OPA2197 (dual, same VSSOP-8) or OPA4197 (quad, TSSOP-14). While all share identical electrical specs and pin functions per channel, the OPA197IDGKT has dedicated V+ and V– pins for one amplifier, whereas dual/quad versions share supplies across channels with different pin allocations. Board redesign is required when substituting between family members.