Texas Instruments INA2181A2IDSQT

Overview

INA2181A2IDSQT from Texas Instruments is a dual-channel, bidirectional current-sense amplifier optimized for high-accuracy, low-power current monitoring in both high-side and low-side configurations. It features 50 V/V fixed gain, ±500 µV maximum offset voltage at 12 V common-mode, 210 kHz bandwidth, and operates from 2.7 V to 5.5 V supply across –40°C to +125°C. It enables precise motor control and battery monitoring by sensing voltage drops across shunt resistors with common-mode voltages up to +26 V.

For engineers reviewing the INA2181A2IDSQT datasheet, INA2181A2IDSQT pinout, INA2181A2IDSQT application, or INA2181A2IDSQT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions for WSON-10 layout, confirmed alternatives with functional trade-offs, and supply-chain support for industrial and embedded production programs.

Technical Context

The INA2181A2IDSQT integrates matched thin-film gain resistors to achieve ±1% maximum gain error and <1 µV/°C offset drift - critical for stable current measurement over temperature. Its proprietary topology supports –0.2 V to +26 V input common-mode range independent of 2.7–5.5 V supply, enabling direct connection to 24-V bus rails without level-shifting.

As a dual-channel device in WSON-10 package, it provides isolated channel separation (>100 dB at 10 kHz) and rail-to-rail output swing (within 30 mV of VS and 5 mV of GND), supporting bidirectional sensing via REF pin biasing - each channel operates independently with dedicated IN+, IN–, OUT, and REF terminals.

Key Specifications

Pinout & Package

INA2181A2IDSQT is housed in a 10-pin, 2.0 mm × 2.0 mm WSON package with exposed thermal pad (DSQ). The package supports high-density PCB layouts and efficient heat dissipation in compact power stages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2181A1IDSQT and INA2181A3IDSQT, the INA2181A2IDSQT strikes a balanced trade-off between gain (50 V/V), bandwidth (210 kHz), and noise performance - making it ideal for mid-range shunt resistors (5–20 mΩ) in motor drives and battery systems requiring both precision and speed.

Availability

INA2181A2IDSQT is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEMs.

Supply support for INA2181A2IDSQT 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 INA2181A2IDSQT belongs to TI's INAx181 family of cost-optimized, bidirectional current-sense amplifiers designed specifically for high-accuracy, low-power current monitoring in industrial, automotive, and renewable energy systems.

FAQ

What is the maximum common-mode voltage supported by the INA2181A2IDSQT?

The INA2181A2IDSQT supports a common-mode input voltage range of –0.2 V to +26 V, independent of its 2.7–5.5 V supply voltage. This allows direct high-side sensing on 24-V industrial buses without external level-shifting circuitry. The specification is validated across the full –40°C to +125°C operating temperature range, and the device maintains accuracy even during bus transients within this range. The INA2181A2IDSQT's internal topology enables this wide range while maintaining low offset and high CMRR.

How does the INA2181A2IDSQT enable bidirectional current sensing?

The INA2181A2IDSQT enables bidirectional current sensing through its dedicated REF pins (REF1 and REF2), which set the zero-current output voltage level. When the differential input voltage (IN+ − IN−) is positive, the output rises above VREF; when negative, it falls below VREF. For example, with VREF = 1.65 V and 50 V/V gain, ±20 mA through a 10-mΩ shunt produces an output swing of 1.65 V ± 10 mV. This architecture eliminates the need for external op-amps or level-shifters and is fully supported in the INA2181A2IDSQT's dual-channel WSON-10 pinout.

What is the bandwidth and slew rate of the INA2181A2IDSQT, and how do they impact system performance?

The INA2181A2IDSQT has a small-signal bandwidth of 210 kHz and a large-signal slew rate of 2 V/µs. These specifications allow it to accurately track rapid current changes in motor phase windings and detect overcurrent faults within microseconds. In BLDC motor control, this enables precise field-oriented control during high-speed commutation; in battery protection, it supports fast trip response for short-circuit events. Both parameters are measured and guaranteed for the A2 variant (50 V/V gain) per TI's SBOS793H datasheet, and are unaffected by the 2.7–5.5 V supply range.

Can the INA2181A2IDSQT be used in low-side current sensing applications, and what is its offset performance?

Yes, the INA2181A2IDSQT is fully specified for low-side current sensing, with ±500 µV maximum offset voltage at 12 V common-mode and ±150 µV maximum at 0 V. This low offset enables accurate measurement of small shunt voltages - for instance, with a 10-mΩ resistor and 1-A load, the 10-mV signal yields ≤5% error contribution from offset alone. Its rail-to-rail output (within 5 mV of GND) preserves dynamic range for low-voltage ADCs. All offset specs are guaranteed over –40°C to +125°C, and the matched gain network ensures minimal drift across temperature.

What package type and thermal characteristics does the INA2181A2IDSQT have?

The INA2181A2IDSQT uses the DSQ (WSON-10) package: a 2.0 mm × 2.0 mm, 10-pin, thermally enhanced leadless package with an exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 74.5°C/W, and junction-to-board (RθJB) is 39.8°C/W - significantly lower than VSSOP variants - enabling reliable operation at full spec in compact, high-power-density designs. The thermal pad may be left floating or connected to GND for improved heat dissipation, and the package is RoHS-compliant and halogen-free per TI's packaging standards.