Texas Instruments INA2181A1QDGSRQ1

Overview

INA2181A1QDGSRQ1 from Texas Instruments is a dual-channel, AEC-Q100 Grade 1 automotive current-sense amplifier with bidirectional sensing capability, 20V/V fixed gain, ±150µV max offset at 0V common-mode, 350kHz bandwidth, and –0.2V to 26V input common-mode range-designed for high-accuracy motor control and battery monitoring in 12V/24V vehicle systems.

For engineers reviewing the INA2181A1QDGSRQ1 datasheet, INA2181A1QDGSRQ1 pinout, INA2181A1QDGSRQ1 application, or INA2181A1QDGSRQ1 equivalent, key selection criteria include bidirectional current measurement accuracy over temperature, rail-to-rail output swing (≤30mV from VS, ≤5mV from GND), functional safety documentation support, and VSSOP-10 package compatibility with automotive PCB layout constraints.

Technical Context

The INA2181A1QDGSRQ1 integrates matched thin-film resistor networks for 20V/V gain, enabling ±1% max gain error and 1µV/°C max offset drift across –40°C to +125°C. Its patented topology supports common-mode voltages up to 26V independent of its 2.7V–5.5V supply, permitting direct high-side sensing on battery rails without level-shifting.

Each channel features independent REF pins for bidirectional offset setting, differential inputs with ±28V absolute max ratings, and 2V/µs slew rate-enabling fast fault detection in motor phase current monitoring and real-time battery cell balancing feedback loops.

Key Specifications

Pinout & Package

The INA2181A1QDGSRQ1 is housed in a 10-pin VSSOP package (DGS), 3.0mm × 4.9mm body size, with exposed thermal pad for enhanced power dissipation in automotive under-hood environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ATA+T, the INA2181A1QDGSRQ1 uniquely delivers dual-channel integration, AEC-Q100 Grade 1 qualification, and functional safety documentation in a single VSSOP-10 package-reducing BOM count and validation effort for automotive motor and battery systems.

Availability

INA2181A1QDGSRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and automotive power management applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.

Supply support for INA2181A1QDGSRQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive-grade signal conditioning and power management ICs.

The INA2181-Q1 product line delivers integrated, AEC-Q100-qualified current-sense amplifiers optimized for bidirectional, high-accuracy current measurement in electric powertrain, battery management, and ADAS subsystems.

FAQ

What is the maximum common-mode voltage supported by the INA2181A1QDGSRQ1?

The INA2181A1QDGSRQ1 supports a common-mode input voltage range of –0.2V to 26V. This allows direct high-side sensing on 24V automotive battery rails without external level-shifting circuitry. The specification is guaranteed across the full operating temperature range of –40°C to +125°C and is independent of the 2.7V–5.5V supply voltage applied to the VS pin. Absolute maximum rating extends to 28V for transient robustness.

How does the bidirectional current sensing work in the INA2181A1QDGSRQ1?

The INA2181A1QDGSRQ1 achieves bidirectional sensing via independent REF pins per channel. When a positive differential voltage (IN+ > IN−) is applied, the output rises above VREF; when negative (IN+ < IN−), the output falls below VREF. For example, with VREF1 = 2.5V and 20V/V gain, ±25mV across a shunt produces an output swing of 2.0V to 3.0V-enabling full-range measurement of charge and discharge currents using a single-ended ADC. The INA2181A1QDGSRQ1 datasheet confirms this behavior in Equation 1 and Figure 7-4.

What is the gain option for the INA2181A1QDGSRQ1 and how is it implemented?

INA2181A1QDGSRQ1 has a fixed gain of 20V/V, denoted by the "A1" suffix in the part number. This gain is implemented using an internal matched thin-film resistor network, eliminating external gain-setting components and minimizing temperature-induced gain drift. The device achieves ±1% maximum gain error across –40°C to +125°C, with typical drift of 1.5 ppm/°C. This architecture ensures stable performance in automotive under-hood environments where thermal cycling would degrade discrete resistor-based solutions.

Is the INA2181A1QDGSRQ1 qualified for automotive applications?

Yes, the INA2181A1QDGSRQ1 is AEC-Q100 qualified for automotive applications, specifically Grade 1 (–40°C to +125°C ambient). It meets HBM ESD Level 2 (±3kV) and CDM Level C6 (±1kV), and includes functional safety documentation to support ISO 26262 system development. The device is manufactured in TI's IATF 16949-certified facilities, with lot traceability and PPAP documentation available. All specifications in the INA2181A1QDGSRQ1 datasheet are validated per AEC-Q100 test conditions.

What package type is used for the INA2181A1QDGSRQ1 and what are its thermal characteristics?

The INA2181A1QDGSRQ1 uses a 10-pin VSSOP package (DGS), measuring 3.0mm × 4.9mm. Its thermal resistance is characterized as RθJA = 177.3°C/W (junction-to-ambient) and RθJB = 98.4°C/W (junction-to-board), with ψJB = 96.9°C/W. The exposed thermal pad (though not electrically connected) improves heat transfer to the PCB. These values are measured per JEDEC JESD51 standards and apply to standard 2-layer boards with 1-in² copper pour-critical for maintaining junction temperature below 150°C in continuous 500µA operation at +125°C ambient.