Texas Instruments INA270AQDRQ1

Overview

INA270AQDRQ1 from Texas Instruments is an automotive-grade, high-speed voltage-output current sense amplifier optimized for low- or high-side shunt monitoring in systems with wide common-mode voltages (–16 V to +80 V). It delivers 14 V/V 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 brake control modules where accurate real-time current sensing under harsh transients is required.

For engineers reviewing the INA270AQDRQ1 datasheet, INA270AQDRQ1 pinout, INA270AQDRQ1 application, or INA270AQDRQ1 equivalent, this page provides verified technical context, SOIC-8 package details, filtering-aware pin functions, automotive AEC-Q100 Grade 1 qualification, and validated alternative options for current-sense amplifier selection in safety-critical vehicle subsystems.

Technical Context

The INA270AQDRQ1 integrates dual-op-amp front ends to support operation across –16 V to +80 V common-mode range independent of supply voltage. Its architecture separates preamplifier output (PRE OUT, 96-kΩ output impedance) from buffer input (BUF IN), enabling direct external RC filtering without signal degradation.

This pinout enables both single-pole (capacitor-only) and second-order Sallen-Key filtering configurations. The internal 2× buffer gain (GBUF = 2 V/V) combines with fixed 14 V/V main gain to deliver total system gain stability across temperature and load, while maintaining 130-kHz small-signal bandwidth and 1-V/μs slew rate.

Key Specifications

Pinout & Package

INA270AQDRQ1 is housed in an SOIC-8 package (4.90 mm × 3.91 mm), optimized for thermal performance (RθJA = 78.8°C/W) and automotive PCB reliability. Pin functions are validated per TI SBOS401C Rev C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA271AQDRQ1, the INA270AQDRQ1 offers lower gain for higher VSENSE ranges and reduced sensitivity to shunt tolerance; compared with MAX40056ATA+T, it trades bandwidth and offset for proven SOIC-8 manufacturability and AEC-Q100 legacy validation in production vehicles.

Availability

INA270AQDRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), brake systems, body control modules (BCM), and electronic stability control (ESC) requiring stable component supply across automotive production lifecycles.

Supply support for INA270AQDRQ1 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 deep expertise in automotive electronics and functional safety design.

The INA27xA-Q1 product line was developed specifically for AEC-Q100-compliant current sensing in high-voltage automotive subsystems-delivering robustness against battery reversal, load dump, and ESD while simplifying filtering and layout.

FAQ

What is the maximum common-mode voltage the INA270AQDRQ1 can handle?

The INA270AQDRQ1 supports a common-mode input voltage range of –16 V to +80 V, enabling direct sensing on 12-V and 48-V battery rails, motor phases, and high-side switch nodes without external level-shifting. This rating is validated per AEC-Q100 and includes margin for automotive transients such as load dump and jump-start conditions. The INA270AQDRQ1 maintains specified accuracy across this full range when operating within recommended supply and temperature conditions.

Does the INA270AQDRQ1 require external filtering components?

The INA270AQDRQ1 does not require external filtering to operate, but its dedicated PRE OUT and BUF IN pins are designed to simplify integration of single-pole or second-order Sallen-Key filters. A 10-nF capacitor between PRE OUT and BUF IN creates a 166-Hz cutoff-ideal for averaging 10-kHz PWM currents in EPS or ESC applications. This architecture avoids gain errors introduced by series resistors in conventional filter designs and preserves the INA270AQDRQ1's 130-kHz bandwidth when filtering is bypassed.

Is the INA270AQDRQ1 pin-compatible with other devices in the INA27x family?

Yes-the INA270AQDRQ1 shares identical SOIC-8 pinout, electrical characteristics, and functional behavior with the INA271AQDRQ1, differing only in gain (14 V/V vs. 20 V/V). Both devices use the same PCB footprint, thermal pad configuration, and filtering interface. No layout changes are needed when migrating between them; only gain-scaling adjustments in firmware or downstream signal conditioning are required to maintain measurement accuracy.

What is the typical quiescent current of the INA270AQDRQ1?

The INA270AQDRQ1 draws a maximum of 900 μA quiescent current at TA = –40°C to +125°C, with typical consumption of 700 μA at 25°C and 5-V supply. This low power draw supports always-on current monitoring in body control modules and diagnostic subsystems without compromising battery standby life. Quiescent current remains stable across supply voltage (2.7–18 V) and common-mode voltage (–16–80 V), ensuring predictable system-level power budgeting.

How does the INA270AQDRQ1 handle low differential input voltages (VSENSE < 20 mV)?

Below 20 mV VSENSE, the INA270AQDRQ1 exhibits degraded accuracy depending on common-mode voltage: output error increases significantly when VCM < 0 V or VCM > VS, with typical VOUT reaching 60 mV at VSENSE = 0 mV. In the 0 V ≤ VCM ≤ VS region, nonlinearity peaks near VCM ≈ VS/2, with maximum VOUT = 0.28 V. For reliable operation, design target VSENSE ≥20 mV-achieved via shunt selection (e.g., 50–100 mV full-scale)-and avoid low-VSENSE regions unless calibrated per application-specific test data.