Texas Instruments INA199B1RSWT

Overview

INA199B1RSWT from Texas Instruments is a bidirectional, zero-drift current-shunt monitor optimized for high-accuracy, low-power current sensing in both high-side and low-side configurations. It features ±150 μV maximum offset voltage, 100 V/V fixed gain, –0.1 V to 26 V common-mode input range, and operates from 2.7 V to 26 V supply with ≤100 μA quiescent current. It enables 10-mV full-scale shunt measurements in notebook battery management and Qi wireless charging transmitters.

For engineers reviewing the INA199B1RSWT datasheet, INA199B1RSWT pinout, INA199B1RSWT application, or INA199B1RSWT equivalent, key selection criteria include guaranteed gain error ≤±1.5% over –40°C to +125°C, 0.5 μV/°C max offset drift, SC70-6 package compatibility, and support for bidirectional sensing without external level-shifting circuitry.

Technical Context

The INA199B1RSWT implements a zero-drift chopper-stabilized amplifier architecture to maintain precision across temperature and time. Its differential input stage rejects common-mode voltages up to 26 V independent of supply voltage, enabling direct connection to high-voltage rails while powered from low-voltage logic supplies.

It uses internal matched resistor networks (R1 = R2 = 1 MΩ, R3 = R4 = 10 kΩ) to set its fixed 100 V/V gain and provides a buffered REF input for output level shifting. The device lacks a dedicated shutdown pin but supports power-gating via V+ control due to its ultra-low 100 μA max quiescent current.

Key Specifications

Pinout & Package

The INA199B1RSWT is packaged in a 6-pin SC70 (DCK) package measuring 2.00 mm × 1.25 mm, suitable for space-constrained portable electronics PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA210BIDCKR and MAX40056AUT+T, the INA199B1RSWT uniquely balances bidirectional operation, 26-V common-mode tolerance, and 2.7-V minimum supply in a 2.0 mm × 1.25 mm footprint-making it optimal for space- and voltage-constrained portable power systems requiring polarity-agnostic current telemetry.

Availability

INA199B1RSWT is available at Aetrix Electronics and suitable for notebook computers, Qi-compliant wireless charging transmitters, telecom equipment, battery chargers, and power management systems requiring stable component supply across extended production lifecycles.

Supply support for INA199B1RSWT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The INA199 family was designed specifically for high-accuracy, low-power current sensing in portable and energy-efficient systems-emphasizing zero-drift performance, wide common-mode operation, and minimal board-space footprint.

FAQ

What is the maximum common-mode voltage supported by the INA199B1RSWT?

The INA199B1RSWT supports a common-mode input voltage range of –0.1 V to 26 V over its full operating temperature range of –40°C to +125°C. This specification applies specifically to the INA199Bx version, as confirmed in Section 6.5 of the SBOS469H datasheet. The –0.1 V lower limit enables true bidirectional sensing near ground, while the 26 V upper limit permits direct connection to 24-V industrial rails or 19-V laptop adapters without external attenuation.

Does the INA199B1RSWT support bidirectional current sensing?

Yes, the INA199B1RSWT supports bidirectional current sensing. Its output voltage swings above and below the REF pin voltage depending on current direction: OUT > REF for current flowing from IN+ to IN−, and OUT < REF for reverse flow. This behavior is enabled by its differential input topology and rail-to-rail output stage, and is explicitly validated in the device's functional description and typical application schematics in the SBOS469H datasheet.

What package type is used for the INA199B1RSWT?

The INA199B1RSWT uses the 6-pin SC70 (DCK) package, with nominal body dimensions of 2.00 mm × 1.25 mm and a maximum height of 0.9 mm. This information is documented in the "Device Information" table and "Mechanical, Packaging, and Orderable Information" section (page 24) of the SBOS469H datasheet. The SC70-6 footprint is pin-compatible with other members of the INA199x1/x2/x3 series in the same package variant.

What is the gain accuracy specification for the INA199B1RSWT over temperature?

The INA199B1RSWT has a maximum gain error of ±1.5% over the full operating temperature range of –40°C to +125°C, as specified in Section 1 (Features) and Table 6-5 of the SBOS469H datasheet. This value applies to all INA199Bx variants-including the B1 sub-version-and reflects worst-case deviation across process, voltage, and temperature corners. Gain drift is further limited to 10 ppm/°C maximum.

Can the INA199B1RSWT operate from a 2.7-V supply?

Yes, the INA199B1RSWT is fully specified to operate from a minimum supply voltage of 2.7 V up to 26 V, as stated in Section 6.3 (Recommended Operating Conditions) and Section 6.5 (Electrical Characteristics) of the SBOS469H datasheet. At 2.7 V, it maintains full functionality including 100 V/V gain, ±150 μV offset, and rail-to-rail output swing within (V+) – 0.2 V and GND + 0.05 V under 10-kΩ load.