Texas Instruments INA185A2QDCKRQ1

Overview

INA185A2QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 bidirectional current-sense amplifier for automotive high- and low-side sensing, featuring 50V/V fixed gain, ±100µV max offset at 12V VCM, 350kHz bandwidth (A1 variant), and –0.2V to 26V common-mode input range. It operates from 2.7V–5.5V supply and delivers rail-to-rail output swing with 2V/µs slew rate, enabling precise motor current monitoring in zonal control modules.

For engineers reviewing the INA185A2QDCKRQ1 datasheet, INA185A2QDCKRQ1 pinout, INA185A2QDCKRQ1 application, or INA185A2QDCKRQ1 equivalent, key selection criteria include bidirectional sensing capability, AEC-Q100 qualification, SC70-6 package constraints, gain-matched resistor network, and functional safety documentation support for ISO 26262-compliant designs.

Technical Context

The INA185A2QDCKRQ1 uses a precision matched-resistor gain network integrated on-die to minimize gain error (±0.2% max) and temperature drift (1.5–8 ppm/°C). Its proprietary topology enables operation with common-mode voltages up to 26V independent of 2.7V–5.5V supply voltage, supporting both high-side and low-side configurations without level-shifting circuitry.

It implements a rail-to-rail output stage with ≤3.5mV swing to GND and ≤25mV swing to VS, and supports bidirectional sensing via REF pin biasing-enabling zero-current output offset at mid-supply for symmetrical current measurement in battery charge/discharge and motor control loops.

Key Specifications

Pinout & Package

The INA185A2QDCKRQ1 is housed in a 6-pin SC70 (DCK) package measuring 2.00mm × 2.10mm, optimized for space-constrained automotive PCBs with thermal resistance R_θJA = 188°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2QDRQ1 and MAX40056ATA+T, the INA185A2QDCKRQ1 uniquely balances AEC-Q100 Grade 1 qualification, SC70-6 footprint, 50V/V gain accuracy, and –0.2V capability for reverse-current detection-making it the optimal choice for space- and safety-constrained automotive current monitoring where 26V VCM suffices.

Availability

INA185A2QDCKRQ1 is available at Aetrix Electronics and suitable for body control modules, zonal power distribution, and ADAS domain controllers requiring stable component supply across automotive production lifecycles.

Supply support for INA185A2QDCKRQ1 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 INA185-Q1 product line targets cost-sensitive, space-constrained automotive current sensing applications-including BCM, zonal controllers, and ADAS subsystems-where AEC-Q100 qualification, bidirectional capability, and integrated precision gain are essential.

FAQ

What is the maximum common-mode voltage supported by the INA185A2QDCKRQ1?

The INA185A2QDCKRQ1 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 or 24V automotive bus rails without external level-shifting circuitry. The –0.2V lower limit enables detection of reverse current flow, critical for bidirectional battery monitoring applications. Operation beyond these limits risks permanent damage per absolute maximum ratings.

Does the INA185A2QDCKRQ1 require external gain-setting resistors?

No, the INA185A2QDCKRQ1 does not require external gain-setting resistors. It integrates a precision matched-resistor network internally configured for 50V/V gain (A2 variant), eliminating component count, layout sensitivity, and temperature-induced gain drift. This monolithic design achieves ±0.2% max gain error and ≤8 ppm/°C drift-superior to discrete op-amp + resistor solutions-and simplifies PCB routing in tight automotive layouts.

How is bidirectional current sensing implemented in the INA185A2QDCKRQ1?

Bidirectional current sensing in the INA185A2QDCKRQ1 is implemented by applying a reference voltage to the REF pin-typically mid-supply (e.g., 2.5V for 5V VS)-to establish a zero-current output baseline. Positive differential input (IN+ > IN−) produces OUT > V_REF; negative differential input produces OUT < V_REF. This architecture enables single-supply operation while preserving full-scale resolution for both charge and discharge currents in battery management and motor control applications.

What is the operating temperature range for the INA185A2QDCKRQ1?

The INA185A2QDCKRQ1 is qualified to AEC-Q100 Grade 1 specifications, supporting continuous operation from –40°C to +125°C ambient temperature. This extended range covers under-hood and cabin-mounted automotive environments, including engine compartments and ADAS domain controllers. Thermal performance is validated with R_θJA = 188°C/W in the SC70-6 package, and all electrical parameters-including offset drift (0.5µV/°C max) and gain error-are guaranteed across this full range.

Can the INA185A2QDCKRQ1 be used in unidirectional current sensing applications?

Yes, the INA185A2QDCKRQ1 supports unidirectional current sensing by connecting the REF pin to GND (for positive-only output) or to VS (for negative-only output). In GND-referenced mode, zero current yields ~0V output, and increasing load current raises OUT linearly. This configuration simplifies interface with single-ended ADCs and reduces signal processing complexity in body control modules where only forward current direction matters.