Texas Instruments INA271AQDRQ1

Overview

INA271AQDRQ1 from Texas Instruments is an automotive-grade, high-speed voltage-output current sense amplifier with 20 V/V fixed gain, –16 V to +80 V common-mode input range, ±2.5-mV max offset, 130-kHz bandwidth, and SOIC-8 package. It enables accurate shunt-based current monitoring in high-voltage automotive power stages such as electric power steering motor drivers and brake system solenoids.

For engineers reviewing the INA271AQDRQ1 datasheet, INA271AQDRQ1 pinout, INA271AQDRQ1 application, or INA271AQDRQ1 equivalent, this page delivers verified technical context, real-world filtering implementation guidance, automotive temperature-range validation (–40°C to +125°C), AEC-Q100 Grade 1 qualification status, and confirmed alternatives for high-side/low-side sensing in safety-critical vehicle subsystems.

Technical Context

The INA271AQDRQ1 integrates a precision preamplifier stage with dedicated PRE OUT and BUF IN pins to support external single-pole or second-order Sallen-Key filtering-enabled by its 96-kΩ PRE OUT output impedance and 2-V/V internal buffer gain. Its dual-op-amp front end maintains stable operation across –16 V to +80 V common-mode voltages independent of the 2.7 V to 18 V supply rail.

It achieves 120-dB CMRR and ±1% max gain error over –40°C to +125°C, with 20-μV/°C offset drift and 55-ppm/°C gain drift. The device draws ≤900 μA quiescent current and delivers rail-to-rail output swing (VS – 0.2 V to GND + 0.05 V) into 10-kΩ loads.

Key Specifications

Pinout & Package

INA271AQDRQ1 is housed in an SOIC-8 package (4.90 mm × 3.91 mm body size) with gull-wing leads, optimized for automotive PCB reliability and thermal dissipation (R_θJA = 78.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA271AQDRQ1, INA240A1QDRQ1 offers superior bandwidth and drift performance but removes the integrated filter interface, increasing design complexity. MAX40056ATA+T provides compact packaging and faster response but lacks automotive qualification and dedicated filtering pins - limiting suitability for safety-critical EPS or brake systems.

Availability

INA271AQDRQ1 is available at Aetrix Electronics and suitable for electric power steering systems, brake control modules, body control units, and electronic stability control applications requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for INA271AQDRQ1 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-grade signal conditioning and power management ICs.

The INA27xA-Q1 product line was designed specifically for high-accuracy, high-common-mode current sensing in automotive powertrain and chassis systems - emphasizing AEC-Q100 compliance, robust EMC performance, and simplified filtering architecture.

FAQ

What is the maximum common-mode voltage the INA271AQDRQ1 can handle?

The INA271AQDRQ1 supports a common-mode input voltage range of –16 V to +80 V, enabling direct connection to 12-V and 48-V battery rails, motor phases, and load-dump transient conditions without external protection components. This specification is validated across the full –40°C to +125°C operating temperature range and is independent of the 2.7 V to 18 V supply voltage applied to the VS pin.

Does the INA271AQDRQ1 require external filtering components?

The INA271AQDRQ1 does not require external filtering to operate, but it is explicitly architected to support optional external filtering via its dedicated PRE OUT and BUF IN pins. A single 10-nF capacitor between PRE OUT and BUF IN creates a 166-Hz single-pole filter ideal for averaging 10-kHz PWM currents - eliminating digital oversampling and reducing MCU processing load in EPS and ESC systems.

Is the INA271AQDRQ1 pin-compatible with the INA270AQDRQ1?

Yes, the INA271AQDRQ1 is pin-compatible with the INA270AQDRQ1 - both use identical SOIC-8 packaging and share identical pin functions, including IN+, IN–, GND, VS, PRE OUT, BUF IN, OUT, and NC. The only functional difference is fixed gain: INA271AQDRQ1 provides 20 V/V, while INA270AQDRQ1 provides 14 V/V. No PCB layout changes are needed when substituting between these two variants.

What is the purpose of the NC pin on the INA271AQDRQ1?

Pin 7 of the INA271AQDRQ1 is labeled NC (No Connect) and has no internal connection. Texas Instruments recommends tying this pin to GND to improve mechanical stability during reflow soldering and reduce potential EMI coupling through the floating pad. Leaving it unconnected does not affect functionality but may compromise board-level robustness in high-vibration automotive environments.

How does the INA271AQDRQ1 achieve AEC-Q100 Grade 1 qualification?

The INA271AQDRQ1 achieves AEC-Q100 Grade 1 qualification through comprehensive testing across –40°C to +125°C ambient temperature, including HBM ESD (2 kV), CDM ESD (1 kV), and extended life testing under bias-temperature stress. All electrical parameters - including ±2.5-mV offset, ±1% gain error, and 130-kHz bandwidth - are guaranteed over this full range, and the SOIC-8 package is qualified for automotive thermal cycling and mechanical shock profiles.