Texas Instruments INA197AIDBVTG4

Overview

INA197AIDBVTG4 from Texas Instruments is a high-voltage current shunt monitor IC designed for bidirectional sensing across shunt resistors in power rails operating from −16 V to +80 V common-mode voltage, with 50 V/V fixed gain, 300 kHz bandwidth, and ±2.2% total output error over temperature - deployed in battery chargers, telecom power supplies, and automotive body control modules.

For engineers reviewing the INA197AIDBVTG4 datasheet, INA197AIDBVTG4 pinout, INA197AIDBVTG4 application, or INA197AIDBVTG4 equivalent, key selection criteria include its SOT-23-5 package compatibility, −40°C to +125°C operation, 900 μA quiescent current, and verified performance at VCM ≥ VS (e.g., 12 V supply with 24 V rail monitoring).

Technical Context

The INA197AIDBVTG4 implements a patented dual-amplifier front-end architecture that enables wide common-mode operation without precision external resistor matching: amplifier A1 activates for negative VCM (−16 V to 0 V), A2 for positive VCM (0 V to +80 V), with seamless transition between modes. Its internal current-to-voltage conversion eliminates dependence on matched R-ratios typical of instrumentation amplifiers.

This architecture delivers 94 dB CMR at 25°C and >100 dB over temperature, supports 20 mV–100 mV full-scale sense voltage (VSENSE), and maintains linear output swing within 0.1 V of V+ and 50 mV above GND under 100 kΩ load - critical for closed-loop current control in switching regulators and motor drivers.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, 1.0 mm height, thermal resistance θ_JA = 221.7°C/W - suitable for space-constrained PCB layouts with moderate power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current shunt monitoring applications.

Compared with INA197AIDBVTG4, INA240A1DRCR offers superior gain accuracy and flexibility at the cost of added external components and layout changes, while MAX4080TASA+ extends supply voltage range but sacrifices bandwidth and increases power consumption - making INA197AIDBVTG4 optimal for cost-sensitive, space-constrained 2.7–18 V systems requiring proven −16 V to +80 V common-mode robustness.

Availability

INA197AIDBVTG4 is available at Aetrix Electronics and suitable for battery chargers, telecom power supplies, and automotive body control modules requiring stable component supply and guaranteed long-term manufacturability.

Supply support for INA197AIDBVTG4 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 signal conditioning and power management ICs.

The INA19x family was engineered specifically for high-common-mode current sensing in harsh environments - targeting automotive, industrial, and telecom applications where reliability across extreme voltage and temperature ranges is non-negotiable.

FAQ

What is the maximum common-mode voltage the INA197AIDBVTG4 can handle?

The INA197AIDBVTG4 supports a common-mode input voltage range of −16 V to +80 V, meaning it can accurately monitor current through shunts placed in circuits where either terminal sits at voltages far beyond its own supply rail - for example, sensing load current on a −12 V rail while powered from +5 V, or monitoring 48 V telecom supplies. This capability is enabled by its proprietary dual-amplifier architecture and does not require external level-shifting circuitry.

Does the INA197AIDBVTG4 require external gain-setting resistors?

No, the INA197AIDBVTG4 has a fixed 50 V/V gain internally configured - no external resistors are needed to set gain. This simplifies design, reduces component count, and eliminates resistor matching errors that degrade common-mode rejection. The device is optimized for direct connection to shunt resistors and standard ADC inputs, making it ideal for compact, high-reliability current sensing applications where layout area and calibration effort must be minimized.

What is the operating temperature range specified for the INA197AIDBVTG4?

The INA197AIDBVTG4 is fully specified over the extended industrial temperature range of −40°C to +125°C. All key parameters - including total output error (±2.2%), gain error, offset voltage drift, and bandwidth - are guaranteed across this range. This makes the device suitable for under-hood automotive applications, industrial motor drives, and outdoor telecom equipment where ambient temperatures exceed standard commercial limits.

Can the INA197AIDBVTG4 be used for bidirectional current sensing?

Yes, the INA197AIDBVTG4 supports bidirectional current sensing because its common-mode range extends to −16 V, allowing VIN− to sit at a higher potential than VIN+. When current flows in reverse (e.g., battery discharge vs. charge), the differential voltage (VIN+ − VIN−) becomes negative, and the output voltage drops proportionally below the mid-supply point - provided the output stage remains within its valid swing range. This behavior is explicitly characterized in the datasheet's low-VSENSE regions.

What is the recommended power supply decoupling for the INA197AIDBVTG4?

A 0.1 μF ceramic capacitor placed as close as possible to the V+ (Pin 5) and GND (Pin 2) pins is mandatory for stable operation of the INA197AIDBVTG4. For noisy supply environments - such as switch-mode power rails - an additional 1 μF–10 μF tantalum or ceramic capacitor in parallel improves high-frequency noise rejection. TI's datasheet Figure 20 shows this configuration, and failure to implement proper decoupling may cause oscillation or degraded AC performance, especially near the 300 kHz bandwidth limit.