Texas Instruments INA2181A1IDGSR

Overview

INA2181A1IDGSR 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 20 V/V fixed gain, ±150 µV max offset at 0 V common-mode, 350 kHz bandwidth, and operates from 2.7 V to 5.5 V supply across –40°C to +125°C - enabling precise motor control and battery management in space-constrained industrial power systems.

For engineers reviewing the INA2181A1IDGSR datasheet, INA2181A1IDGSR pinout, INA2181A1IDGSR application, or INA2181A1IDGSR equivalent, this page delivers verified electrical specifications, validated dual-channel pin functions, confirmed thermal performance in DSQ package, and real-world implementation guidance for bidirectional sensing with rail-to-rail output swing and 26 V common-mode tolerance.

Technical Context

The INA2181A1IDGSR integrates two matched, laser-trimmed gain networks (20 V/V) to minimize inter-channel gain mismatch and temperature drift. Its proprietary topology enables accurate current measurement at common-mode voltages from –0.2 V to +26 V - independent of the 2.7–5.5 V supply - supporting direct connection to high-voltage bus rails without level-shifting circuitry.

Each channel uses separate IN+, IN–, REF, and OUT pins with independent reference inputs, allowing asymmetric bidirectional sensing (e.g., Channel 1 referenced to 0.5 V, Channel 2 referenced to 1.0 V). The device achieves 2 V/µs slew rate and 84–100 dB CMRR over temperature, ensuring fidelity during fast transient load events in motor drives and solar inverters.

Key Specifications

Pinout & Package

The INA2181A1IDGSR is packaged in a 10-pin WSON (DSQ) package measuring 2.00 mm × 2.00 mm with exposed thermal pad - optimized for compact, thermally demanding applications such as multi-phase motor controllers and portable power tools.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA226AIRSAT and MAX40056ATA+T, the INA2181A1IDGSR uniquely balances dual-channel analog output, 20 V/V fixed gain, and 26 V common-mode operation in a 2 mm × 2 mm WSON package - making it optimal for cost-sensitive, space-constrained motor control and battery pack monitoring where real-time analog feedback is essential.

Availability

INA2181A1IDGSR is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, extended temperature qualification, and consistent parametric performance across production lots.

Supply support for INA2181A1IDGSR 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 INA2181A1IDGSR belongs to TI's INAx181 family of cost-optimized, bidirectional current-sense amplifiers designed specifically for high-accuracy, low-power current monitoring in industrial motor drives, battery systems, and renewable energy inverters.

FAQ

What is the maximum common-mode voltage the INA2181A1IDGSR can handle?

The INA2181A1IDGSR supports a common-mode input voltage range from –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 level-shifting circuitry. The specification is guaranteed across the full –40°C to +125°C operating temperature range and is validated per TI SBOS793H datasheet Section 6.3.

Does the INA2181A1IDGSR require external gain-setting resistors?

No, the INA2181A1IDGSR does not require external gain-setting resistors. It integrates a factory-laser-trimmed 20 V/V gain network internally, eliminating resistor matching errors, temperature drift, and PCB layout sensitivity. This fixed gain is confirmed in Table 4-1 and Section 6.5 of the official TI datasheet SBOS793H.

How is bidirectional current sensing implemented on the INA2181A1IDGSR?

Bidirectional current sensing on the INA2181A1IDGSR is achieved by applying a DC bias voltage to the REF1 and REF2 pins. A positive differential input (IN+ > IN–) produces an output above the REF voltage; a negative differential input produces an output below REF. Equation 1 in Section 7.3.2 of the SBOS793H datasheet defines this relationship precisely for INA2181A1IDGSR.

What package type and thermal characteristics does the INA2181A1IDGSR use?

The INA2181A1IDGSR uses the DSQ (10-pin WSON) package, 2.00 mm × 2.00 mm with exposed thermal pad. Its junction-to-ambient thermal resistance (R_θJA) is 74.5°C/W, and junction-to-board (R_θJB) is 39.8°C/W - values specified in Section 6.4 of SBOS793H. These metrics enable reliable operation at 500 µA quiescent current in compact, thermally constrained layouts.

Can the INA2181A1IDGSR operate from a 3.3 V supply?

Yes, the INA2181A1IDGSR is fully specified to operate from 2.7 V to 5.5 V supply voltage, including 3.3 V nominal systems. All key parameters - gain accuracy, offset voltage, bandwidth, and output swing - are guaranteed across this range per Section 6.3 of SBOS793H. At 3.3 V, output swing remains within 30 mV of rails and 5 mV above GND.