Texas Instruments INA198AIDBVT

Overview

INA198AIDBVT 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 −40°C to +125°C - used in battery charger current feedback loops and telecom DC-DC converter monitoring.

For engineers reviewing the INA198AIDBVT datasheet, INA198AIDBVT pinout, INA198AIDBVT application, or INA198AIDBVT equivalent, this page delivers verified specifications, SOT-23 pin mapping, real-world use cases in automotive and industrial power systems, and two validated alternative parts with documented functional differences.

Technical Context

The INA198AIDBVT implements a patented dual-amplifier front-end architecture that enables operation across −16 V to +80 V common-mode range while powered by a single 2.7 V to 18 V supply. It converts differential shunt voltage (V_SENSE) into a proportional output voltage using internal current-mirror-based signal conversion, eliminating reliance on precision resistor matching for CMR.

Its 100 V/V gain path is optimized for low-V_SENSE accuracy down to 20 mV, with output swing limited to (V+) – 0.2 V and GND + 50 mV under load. The device enters reduced-accuracy modes when V_SENSE < 20 mV and V_CM falls within 0 V to V+, where internal amplifier transition causes nonlinearity up to 300 mV offset.

Key Specifications

Pinout & Package

SOT-23 (DBV) package: 5-pin, 2.90 mm × 1.60 mm body, 0.95 mm height, thermal resistance θ_JA = 221.7°C/W - suitable for space-constrained PCB layouts with moderate power dissipation (<150 mW).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA198AIDBVT, INA240A1EDBVR offers tighter gain accuracy and higher bandwidth but restricts supply flexibility, while MAX4080TASA+ extends supply voltage range to 76 V yet lacks integrated ESD protection - making INA198AIDBVT optimal for cost-sensitive 12 V–18 V industrial designs requiring robustness and wide common-mode coverage.

Availability

INA198AIDBVT is available at Aetrix Electronics and suitable for automotive battery management, telecom DC-DC monitoring, and industrial motor drive applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA198AIDBVT 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-voltage current sensing in harsh environments - targeting automotive, industrial, and telecom power systems where wide common-mode range and temperature stability are mandatory.

FAQ

What is the maximum common-mode voltage the INA198AIDBVT can handle?

The INA198AIDBVT supports a common-mode input voltage range of −16 V to +80 V, independent of its supply voltage (2.7 V to 18 V). This allows it to monitor current in negative-rail systems (e.g., −12 V telecom) and high-positive buses (e.g., 48 V industrial) without external level-shifting circuitry. The specification is validated per TI SBOS307G datasheet Section 7.3.

Does the INA198AIDBVT require external gain-setting resistors?

No, the INA198AIDBVT features factory-trimmed fixed gain of 100 V/V and requires no external resistors. Its internal precision resistor network is laser-trimmed to ensure ±1% initial gain error, eliminating layout sensitivity and component count - a key differentiator from programmable current sense amplifiers like the INA199 series.

What is the bandwidth and settling time of the INA198AIDBVT?

The INA198AIDBVT has a small-signal bandwidth of 200 kHz (C_LOAD = 5 pF) and 1% settling time of 2 μs for 10 mV to 100 mV step inputs. These values enable accurate current sampling in switching power supplies with PWM frequencies up to 50 kHz and fast overcurrent response in motor control applications.

Can the INA198AIDBVT operate with a 3.3 V supply?

Yes, the INA198AIDBVT operates from 2.7 V to 18 V, fully supporting 3.3 V nominal supply. At 3.3 V, its output swings from GND + 50 mV to V+ – 0.2 V (i.e., 3.1 V), maintaining compatibility with 3.3 V ADCs. Quiescent current remains ≤900 μA, making it suitable for low-power always-on monitoring.

How does the INA198AIDBVT handle low-sense-voltage conditions below 20 mV?

When V_SENSE < 20 mV, the INA198AIDBVT exhibits degraded accuracy: output may deviate up to 300 mV from ideal in negative or high-positive common-mode regions, and nonlinearity increases significantly between 0 V and V_CM. For reliable operation, design for V_SENSE ≥20 mV - e.g., use ≥20 mΩ shunt at 1 A full-scale.