Texas Instruments INA198AIDBVTG4

Overview

INA198AIDBVTG4 from Texas Instruments is a high-voltage current shunt monitor IC designed for bidirectional sensing across precision shunt resistors in power rails operating from −16 V to +80 V common-mode voltage, with 100 V/V fixed gain, 200 kHz bandwidth, and ±3% total output error over temperature - deployed in battery chargers, telecom power supplies, and automotive power management systems.

For engineers reviewing the INA198AIDBVTG4 datasheet, INA198AIDBVTG4 pinout, INA198AIDBVTG4 application, or INA198AIDBVTG4 equivalent, key selection criteria include its −16 V to +80 V common-mode range, SOT-23-5 package constraints, 100 V/V transfer function, 200 kHz small-signal bandwidth, and operation from +2.7 V to +18 V supply - all critical for high-side/low-side current monitoring in safety-critical DC power paths.

Technical Context

The INA198AIDBVTG4 implements a patented dual-amplifier front-end architecture that enables wide common-mode operation without matched resistor networks: amplifier A1 activates for negative common-mode voltages (−16 V to 0 V), while A2 handles positive ranges (0 V to +80 V), with seamless transition between modes. Its internal current-to-voltage conversion stage isolates gain accuracy from resistor matching tolerances.

This architecture delivers 120 dB CMR at DC and maintains ≥100 dB CMR up to 10 kHz, supporting accurate current measurement in noisy industrial and automotive environments where supply rails float significantly above or below ground - independent of the +2.7 V to +18 V analog supply voltage.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads - optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA198AIDBVTG4, INA240A1IDR offers superior speed and drift but adds external component complexity, while MAX4080TASA+ trades compactness for easier thermal management and marginally better noise immunity - making INA198AIDBVTG4 optimal for cost-sensitive, space-constrained designs needing proven SOT-23 reliability.

Availability

INA198AIDBVTG4 is available at Aetrix Electronics and suitable for battery chargers, telecom power supplies, and automotive power management systems requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for INA198AIDBVTG4 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 analog signal chains and power management ICs.

The INA19x family was designed specifically for high-accuracy, high-common-mode current sensing in industrial, automotive, and computing power systems - delivering integrated solutions that eliminate level-shifting complexity while maintaining metrology-grade performance.

FAQ

What is the maximum common-mode voltage the INA198AIDBVTG4 can measure?

The INA198AIDBVTG4 supports a common-mode input voltage range of −16 V to +80 V, meaning it can accurately sense current through a shunt resistor placed anywhere in a circuit where the voltage at VIN+ or VIN− falls within that span - including high-side positions above the supply rail or negative-rail configurations. This capability is intrinsic to its dual-amplifier architecture and does not require external level-shifting components. The INA198AIDBVTG4 maintains specified accuracy across this full range when VSENSE ≥20 mV and operating within its recommended supply and temperature conditions.

Does the INA198AIDBVTG4 require external gain-setting resistors?

No, the INA198AIDBVTG4 integrates a precise 100 V/V gain stage internally, eliminating the need for external resistors to set gain. This fixed-ratio architecture ensures consistent transfer function performance across temperature and unit-to-unit variation, reduces PCB layout sensitivity, and simplifies design validation. Unlike programmable current sense amplifiers, the INA198AIDBVTG4 delivers guaranteed 100 V/V scaling directly from the device pins - confirmed by TI's production test data and reflected in its Electrical Characteristics table under "Gain" for INA195/INA198 variants.

What is the bandwidth limitation of the INA198AIDBVTG4 and how does it affect current control loops?

The INA198AIDBVTG4 has a small-signal bandwidth of 200 kHz, defined as the −3 dB point with 5 pF capacitive load. This enables use in current control loops for switching power supplies operating up to 50 kHz, where phase margin remains sufficient for stable feedback. Its 2 μs 1% settling time ensures accurate capture of fast current transients, such as inductor saturation events or short-circuit detection. Bandwidth is gain-dependent: the INA198AIDBVTG4's 100 V/V variant is intentionally limited to 200 kHz to optimize stability and noise performance versus the 50 V/V (300 kHz) and 20 V/V (500 kHz) members of the same family.

Can the INA198AIDBVTG4 operate from a 3.3 V supply?

Yes, the INA198AIDBVTG4 operates from a single supply ranging from +2.7 V to +18 V, fully supporting 3.3 V logic-compatible systems. At 3.3 V supply, its output swing is specified as (V+) – 0.2 V to (GND) + 50 mV, yielding a usable output range of ~0.05 V to 3.1 V for a 100 mV full-scale shunt voltage - sufficient for most 10- to 12-bit ADCs. Quiescent current remains ≤900 μA, and total output error stays within ±3% over temperature, making it suitable for always-on current monitoring in battery-powered devices powered by single-cell Li-ion or regulated 3.3 V rails.

How does the INA198AIDBVTG4 handle negative common-mode voltages?

The INA198AIDBVTG4 uses an internal dual-amplifier architecture where amplifier A1 activates for common-mode voltages from −16 V to 0 V, enabling accurate current sensing even when the shunt is placed below ground - such as in negative-rail power supplies or H-bridge motor control low-side legs. During this mode, the device maintains ≥100 dB common-mode rejection and ≤300 mV output offset when VSENSE < 20 mV. Its ability to operate down to −16 V without external biasing or level shifters is a key differentiator versus conventional current sense amplifiers, and is validated across temperature per TI's SBOS307G datasheet specifications.