Texas Instruments INA181A3QDBVRQ1

Overview

INA181A3QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier designed for bidirectional, high-accuracy shunt-based current monitoring in both low-side and high-side configurations. It features 100V/V fixed gain, ±500µV max offset at 12V common-mode, 350kHz bandwidth (A1 variant), 2V/µs slew rate, and operates from 2.7V–5.5V supply across –40°C to +125°C - deployed in motor control and battery management systems.

For engineers reviewing the INA181A3QDBVRQ1 datasheet, INA181A3QDBVRQ1 pinout, INA181A3QDBVRQ1 application, or INA181A3QDBVRQ1 equivalent, this page delivers verified specifications, validated SOT-23-6 pin functions, automotive-grade thermal and ESD performance data, and real-world implementation guidance for high-reliability power monitoring designs.

Technical Context

The INA181A3QDBVRQ1 implements a precision current-shunt monitor architecture with integrated matched resistor gain network optimized for 100V/V operation, enabling accurate RTI voltage measurement across sense resistors under wide common-mode conditions. Its input stage supports –0.2V to +26V VCM independent of VS, and its rail-to-rail output swings within 30mV of VS and 5mV of GND.

Functional safety capability is supported via TI's documentation package for ISO 26262 ASIL-B system integration. The device uses a single-supply topology with 260µA max quiescent current and achieves ±1% max gain error over temperature, making it suitable for closed-loop motor control and battery cell balancing where signal fidelity and thermal stability are critical.

Key Specifications

Pinout & Package

INA181A3QDBVRQ1 is packaged in a 6-pin SOT-23 (DBV) footprint measuring 2.90mm × 2.80mm, optimized for space-constrained automotive PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3QDRQ1 and MAX40056ATA+T, the INA181A3QDBVRQ1 offers optimal balance of AEC-Q100 compliance, SOT-23 compactness, and 150kHz bandwidth for mainstream 12V/24V automotive current sensing - delivering proven reliability without over-specifying for entry-level EPS or body control modules.

Availability

INA181A3QDBVRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and lighting control applications requiring stable component supply across automotive production lifecycles.

Supply support for INA181A3QDBVRQ1 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 deep expertise in automotive electronics and functional safety solutions.

The INA181-Q1 product line was engineered specifically for cost-optimized, high-reliability current sensing in automotive power systems - targeting EPS, battery management, and ADAS power domains where precision, thermal robustness, and qualification rigor are non-negotiable.

FAQ

What is the maximum common-mode voltage supported by the INA181A3QDBVRQ1?

The INA181A3QDBVRQ1 supports a common-mode input voltage range of –0.2V to +26V, independent of its 2.7V–5.5V supply voltage. This allows direct high-side sensing on 12V and 24V automotive buses without external level-shifting circuitry. The specification is validated across the full operating temperature range of –40°C to +125°C, and the INA181A3QDBVRQ1 maintains accuracy even when VCM exceeds VS - a key enabler for compact, high-efficiency automotive power monitoring designs.

Does the INA181A3QDBVRQ1 support bidirectional current sensing, and how is it implemented?

Yes, the INA181A3QDBVRQ1 supports true bidirectional current sensing via its REF pin. Applying a reference voltage (e.g., VS/2) to REF establishes a zero-current output baseline; positive differential input yields OUT > VREF, while negative differential input yields OUT < VREF. This architecture enables regenerative current measurement in motor drives and battery charge/discharge monitoring. The INA181A3QDBVRQ1's matched gain network and low offset ensure symmetric accuracy in both directions - critical for energy-recapture systems in hybrid vehicles.

What is the gain accuracy and temperature drift performance of the INA181A3QDBVRQ1?

The INA181A3QDBVRQ1 has a maximum gain error of ±1% over –40°C to +125°C, with gain drift specified at ≤20ppm/°C. Its 100V/V fixed gain is achieved using an integrated, laser-trimmed thin-film resistor network - eliminating external component tolerance and layout sensitivity. This ensures stable scaling across temperature and time, making the INA181A3QDBVRQ1 suitable for automotive applications where calibration stability over 15-year service life is required without periodic recalibration.

Which package options are available for the INA181A3QDBVRQ1, and what is the DBV variant?

INA181A3QDBVRQ1 is offered exclusively in the 6-pin SOT-23 (DBV) package, measuring 2.90mm × 2.80mm. The "DBV" suffix denotes Texas Instruments' standardized SOT-23-6 outline with gull-wing leads, optimized for automated placement and reflow soldering in high-volume automotive PCB assembly. Unlike the SC70-6 (DCK) variant, DBV provides superior thermal dissipation (RθJA = 198.7°C/W) and mechanical robustness - making it the preferred choice for under-hood applications subject to vibration and thermal cycling.

Is the INA181A3QDBVRQ1 qualified for automotive use, and what does AEC-Q100 Grade 1 mean?

Yes, the INA181A3QDBVRQ1 is fully AEC-Q100 qualified for automotive applications, meeting Grade 1 requirements: operational ambient temperature range of –40°C to +125°C, HBM ESD ≥±3kV, and CDM ESD ≥±1kV. It also includes functional safety documentation (FIT rate, FMEA, safety manual) to support ISO 26262 ASIL-B system development. This qualification confirms the INA181A3QDBVRQ1 has passed accelerated stress testing for humidity, temperature cycling, and package integrity - ensuring reliability in safety-critical automotive subsystems like power steering and brake control.