Texas Instruments INA271AQDRZF

Overview

INA271AQDRZF from Texas Instruments is an automotive-grade, high-speed voltage-output current sense amplifier optimized for high-side or low-side shunt monitoring in systems with wide common-mode voltages (–16 V to +80 V). It delivers 20 V/V fixed gain, 130 kHz bandwidth, ±2.5-mV max input offset, and operates from a single 2.7-V to 18-V supply. It is used in electric power steering (EPS) and electronic stability control (ESC) systems where precise, noise-immune current feedback is required.

For engineers reviewing the INA271AQDRZF datasheet, INA271AQDRZF pinout, INA271AQDRZF application, or INA271AQDRZF equivalent, this page provides verified technical context, SOIC-8 package mapping, filtering-aware pin functions, automotive-grade accuracy specs (CMRR = 120 dB, gain drift = 55 ppm/°C), and real-world design guidance for high-voltage transient resilience and analog signal conditioning.

Technical Context

The INA271AQDRZF integrates a precision preamplifier stage with a dedicated buffer stage, exposing PRE OUT (pin 3) and BUF IN (pin 4) to enable external RC filtering without degrading accuracy. Its dual-op-amp front end supports operation across –16 V to +80 V common-mode range while maintaining 120 dB CMRR and 20 μV/°C max offset drift.

It features a 96-kΩ output impedance at PRE OUT-characterized with ±30% initial variation and –2200 ppm/°C temperature coefficient-enabling predictable first-order RC filtering or Sallen-Key second-order configurations. The 20 V/V gain (INA271A-Q1 variant), 130 kHz bandwidth, and 1.5-Ω output impedance at OUT (pin 5) support fast current-loop response in motor control and brake actuation circuits.

Key Specifications

Pinout & Package

INA271AQDRZF is housed in an SOIC-8 package (4.90 mm × 3.91 mm), qualified per AEC-Q100 Grade 1 (–40°C to +125°C ambient). Pinout supports simplified external filtering via dedicated PRE OUT and BUF IN terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA271AQDRZF, INA240A1QDR offers higher speed but sacrifices filtering capability and automotive qualification, while MAX40056ATA+T extends common-mode range beyond 80 V but lacks AEC-Q100 Grade 1 validation-making INA271AQDRZF the only option qualified for EPS and ESC deployment under ISO 26262.

Availability

INA271AQDRZF is available at Aetrix Electronics and suitable for electric power steering (EPS), brake actuation systems, electronic stability control (ESC), and body control module (BCM) designs requiring stable component supply across automotive production lifecycles.

Supply support for INA271AQDRZF 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, industrial, and power management solutions.

The INA27xA-Q1 product line was designed specifically for automotive current sensing in safety-critical subsystems-including EPS, ESC, and brake-by-wire-where wide common-mode range, AEC-Q100 qualification, and external filter integration are mandatory.

FAQ

What is the maximum common-mode voltage the INA271AQDRZF can handle?

The INA271AQDRZF supports a common-mode input voltage range of –16 V to +80 V, enabling direct connection to battery rails, motor phases, or 48-V architectures without external level-shifting. This rating is validated per AEC-Q100 and covers automotive fault conditions including load dump (up to +80 V) and reverse battery (–16 V), eliminating need for external protection diodes in most implementations.

How does the PRE OUT and BUF IN pin configuration improve filtering performance in the INA271AQDRZF?

The INA271AQDRZF exposes PRE OUT (pin 3) and BUF IN (pin 4) to decouple the preamplifier and output buffer stages, allowing external RC or Sallen-Key filters to be inserted without loading the high-gain front end. With a characterized 96-kΩ PRE OUT impedance, a single 10-nF capacitor yields a 166-Hz cutoff-ideal for averaging 10-kHz PWM ripple-while preserving gain accuracy and stability across temperature.

Is the INA271AQDRZF pin-compatible with the INA270AQDRZF?

No-the INA271AQDRZF and INA270AQDRZF share identical SOIC-8 packaging and pinout, but differ in gain (20 V/V vs. 14 V/V) and associated electrical characteristics including total output error and gain drift. They are functionally interchangeable only if the system design accommodates the 43% higher output scaling and revised accuracy budget; no PCB changes are needed, but firmware gain calibration must be updated.

What is the quiescent current consumption of the INA271AQDRZF across its operating temperature range?

The INA271AQDRZF draws a maximum of 900 µA at TA = –40°C to +125°C, with typical consumption of 700 µA at 25°C and 5 V supply. At minimum supply (2.7 V), quiescent current drops to 350 µA, supporting ultra-low-power always-on monitoring in body control modules without compromising startup reliability or thermal performance.

Does the INA271AQDRZF require external bypass capacitors, and if so, what values are recommended?

Yes-TI specifies minimum bypass capacitance of 0.01 µF and 0.1 µF placed as close as possible to the VS and GND pins of the INA271AQDRZF. These capacitors stabilize the internal regulators and suppress high-frequency noise coupling into the sensitive preamplifier stage. For systems with noisy 12-V supplies (e.g., engine compartments), adding a 10-µF electrolytic capacitor in parallel further improves PSR above 10 kHz.