Texas Instruments INA2181A2IDGSR

Overview

INA2181A2IDGSR 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 feedback and battery charge/discharge monitoring in compact industrial power systems.

For engineers reviewing the INA2181A2IDGSR datasheet, INA2181A2IDGSR pinout, INA2181A2IDGSR application, or INA2181A2IDGSR equivalent, this page delivers verified specifications, dual-channel pin mapping for VSSOP-10, real-world use cases in solar inverters and motor drives, and two validated alternative parts with documented functional and layout implications.

Technical Context

The INA2181A2IDGSR integrates matched thin-film gain resistors for 50 V/V fixed gain, minimizing gain error (±1% max) and drift (≤20 ppm/°C). Its proprietary topology supports common-mode input voltages from –0.2 V to +26 V-fully independent of its 2.7–5.5 V supply-enabling direct sensing on 24-V bus rails without level-shifting.

Each channel uses a precision instrumentation amplifier core with rail-to-rail output swing (within 30 mV of VS and 5 mV of GND), 2 V/µs slew rate, and 40 nV/√Hz input-referred noise. Bidirectional operation is enabled via independent REF1/REF2 pins, allowing zero-centered output for AC or reversing DC current measurement.

Key Specifications

Pinout & Package

INA2181A2IDGSR is housed in a 10-pin VSSOP package (DGS), measuring 3.0 mm × 4.9 mm, with exposed thermal pad (optional GND connection). The package supports automated optical inspection and provides low thermal resistance (R_θJA = 177.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2IDR and MAX40056AUB+, the INA2181A2IDGSR uniquely balances dual-channel integration, guaranteed 50 V/V gain accuracy, –40°C to +125°C qualification, and 26-V common-mode capability-making it optimal for space-constrained, thermally demanding industrial power modules where channel matching and supply simplicity are critical.

Availability

INA2181A2IDGSR is available at Aetrix Electronics and suitable for motor control, battery management, solar inverter, and industrial power supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA2181A2IDGSR 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 INA2181A2IDGSR 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 supported by the INA2181A2IDGSR?

The INA2181A2IDGSR 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 level-shifting circuitry. The specification is guaranteed across the full operating temperature range (–40°C to +125°C) and is validated per TI SBOS793H datasheet Section 6.3.

Does the INA2181A2IDGSR require external gain-setting resistors?

No, the INA2181A2IDGSR does not require external gain-setting resistors. It integrates a precision, on-die matched resistor network configured for fixed 50 V/V gain (denoted by the "A2" suffix). This eliminates resistor tolerance errors, improves temperature stability, and reduces PCB area-confirmed in TI's device comparison table (Section 4) and electrical characteristics (Section 6.5).

How is bidirectional current sensing implemented on the INA2181A2IDGSR?

Bidirectional sensing on the INA2181A2IDGSR is achieved by applying a DC reference voltage (e.g., VS/2) to the REF1 and REF2 pins. A positive differential input (IN+ > IN–) produces an output above VREF; a negative differential input produces an output below VREF. This is explicitly defined in Equation 1 of the datasheet and validated in Figure 7-4 (high-side/low-side connections).

What package type and pin count does the INA2181A2IDGSR use?

The INA2181A2IDGSR uses a 10-pin VSSOP package (orderable code DGS), measuring 3.0 mm × 4.9 mm, with an exposed thermal pad. Pin functions-including dual IN+/IN–, OUT, REF, VS, and GND-are fully documented in Table 5-2 and Figures 5-3–5-4 of the SBOS793H datasheet. No alternate packages (e.g., WSON) are assigned to the "IDGSR" suffix.

What is the typical quiescent current consumption of the INA2181A2IDGSR?

The INA2181A2IDGSR draws a maximum quiescent current of 500 µA at 25°C and up to 520 µA across –40°C to +125°C (per Section 6.5, "POWER SUPPLY" table). This value applies to both channels simultaneously and is measured with VSENSE = 0 mV. The low IQ enables always-on monitoring in battery-backed systems without significant runtime impact.