Texas Instruments INA198AIDBVR

Overview

INA198AIDBVR from Texas Instruments is a high-voltage current shunt monitor IC with 100 V/V fixed gain, −16 V to +80 V common-mode input range, 200 kHz bandwidth, ±3% total output error over temperature, and 900 μA max quiescent current. It operates from a single +2.7 V to +18 V supply and delivers voltage output proportional to sensed shunt voltage in battery management, motor control, and telecom power systems.

For engineers reviewing the INA198AIDBVR datasheet, INA198AIDBVR pinout, INA198AIDBVR application, or INA198AIDBVR equivalent, key selection criteria include its wide common-mode tolerance, gain accuracy at low VSENSE, output swing limitations near supply rails, and SOT-23 pin compatibility within the INA19x family.

Technical Context

The INA198AIDBVR uses a patented dual-amplifier front-end architecture that enables operation across −16 V to +80 V common-mode voltages while powered from a single low-voltage rail. Its internal current-conversion topology eliminates reliance on precision resistor matching for CMR, achieving ≥100 dB CMR over temperature.

It delivers 100 V/V gain with 200 kHz small-signal bandwidth and supports unidirectional current sensing in both positive and negative common-mode regions. Output stage is optimized for sourcing current (≥10 mA), with limited sinking capability (~400 μA), and requires external load resistance ≥500 kΩ for full-scale linearity.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA198AIDBVR, INA240A1IDR offers superior accuracy and speed but restricts supply voltage to ≤5.5 V, while MAX4080TASA+ supports higher supply rails but cannot reliably sense below −0.1 V common-mode - making INA198AIDBVR uniquely suited for true bipolar HV monitoring with single-supply simplicity.

Availability

INA198AIDBVR is available at Aetrix Electronics and suitable for battery management, telecom power supplies, and industrial motor control requiring stable component supply across extended temperature and voltage ranges.

Supply support for INA198AIDBVR 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 product line was designed specifically for high-common-mode current sensing in automotive, industrial, and telecom power systems - delivering robust, single-supply solutions where isolation or complex biasing would otherwise be required.

FAQ

What is the maximum common-mode voltage the INA198AIDBVR can tolerate?

The INA198AIDBVR supports a common-mode input voltage range of −16 V to +80 V, meaning it can accurately measure shunt voltage drops even when the shunt is placed in high-side or negative-rail configurations. This specification is independent of the +2.7 V to +18 V supply voltage and is validated across the full −40°C to +125°C operating temperature range. The INA198AIDBVR maintains functionality and specified accuracy throughout this entire range without external level-shifting circuitry.

Does the INA198AIDBVR support bidirectional current sensing?

The INA198AIDBVR is optimized for unidirectional current sensing - its output voltage scales linearly with the magnitude of VSENSE = VIN+ − VIN−, but does not indicate polarity. When VSENSE is negative (i.e., current flows opposite the intended direction), the output saturates near GND (≥50 mV above GND). For true bidirectional sensing, a zero-centered reference or dual-supply configuration is required - neither of which is supported natively by the INA198AIDBVR. Applications requiring direction detection must use external circuitry or select a dedicated bidirectional variant.

What is the minimum shunt voltage (VSENSE) for accurate operation of the INA198AIDBVR?

The INA198AIDBVR provides full accuracy (±3% total output error) when VSENSE ≥20 mV. Below 20 mV, output accuracy degrades significantly: for VSENSE < 20 mV and −16 V ≤ VCM < 0 V or VS < VCM ≤80 V, output error increases and VOUT may deviate up to 300 mV at VSENSE = 0 mV. In the 0 V ≤ VCM ≤ VS region with low VSENSE, nonlinearity is most severe. Therefore, design targets should maintain VSENSE ≥20 mV under all operating conditions to ensure compliance with datasheet specifications.

Can the INA198AIDBVR drive an ADC input directly?

Yes, the INA198AIDBVR can drive many 12-bit and lower-resolution ADC inputs directly, provided the ADC's input impedance is ≥500 kΩ and its input capacitance is ≤10 nF. Its output stage sources up to 10 mA but sinks only ~400 μA, so it must be used with ADCs that draw negligible input current and do not require sinking capability. For driving capacitive loads >10 nF or low-impedance inputs, an external buffer op-amp is recommended to prevent instability or settling errors.

How does the INA198AIDBVR differ from the INA197AIDBVR?

The INA198AIDBVR and INA197AIDBVR share identical SOT-23-5 pinout, supply range (+2.7 V to +18 V), common-mode range (−16 V to +80 V), and thermal specifications, but differ in gain and bandwidth: INA198AIDBVR has 100 V/V gain and 200 kHz bandwidth, while INA197AIDBVR has 50 V/V gain and 300 kHz bandwidth. Their electrical characteristics (offset, error, PSR) are otherwise matched. Selection depends on required output scaling and loop-speed requirements - e.g., INA198AIDBVR suits 1 V full-scale ADC interfaces, while INA197AIDBVR better supports higher-bandwidth control loops with moderate gain.