Texas Instruments INA185A2IDCKR

Overview

INA185A2IDCKR from Texas Instruments is a bidirectional, high-precision current sense amplifier optimized for space-constrained, cost-sensitive applications. It features 50 V/V fixed gain, ±55 µV max offset voltage at 0 V common-mode, 350-kHz bandwidth (A1 variant), –0.2 V to +26 V input common-mode range, and operates from 2.7 V to 5.5 V supply. It enables accurate low-side and high-side current monitoring in motor control and battery management systems.

For engineers reviewing the INA185A2IDCKR datasheet, INA185A2IDCKR pinout, INA185A2IDCKR application, or INA185A2IDCKR equivalent, this page delivers verified specifications, validated SOT-563 package details, confirmed bidirectional sensing capability, and real-world implementation context for power electronics design.

Technical Context

The INA185A2IDCKR employs a precision matched-resistor gain network to achieve ±0.2% max gain error and 0.5 µV/°C offset drift, enabling stable current measurement across –40°C to +125°C. Its internal topology decouples common-mode input range (–0.2 V to +26 V) from supply voltage (2.7 V–5.5 V), supporting both high-side and low-side shunt configurations without level-shifting circuitry.

With 2 V/µs slew rate and rail-to-rail output swing (within 25 mV of VS and 3.5 mV of GND), the device responds rapidly to transient load currents while maintaining linearity. The REF pin allows configurable unidirectional or bidirectional operation-biasing REF to mid-supply enables symmetric ±current detection with output centered at VREF.

Key Specifications

Pinout & Package

INA185A2IDCKR is housed in a 6-pin SOT-563 package (1.6 mm × 1.6 mm × 0.55 mm), offering 39% smaller footprint than SC70 while maintaining industry-standard pin compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA185A2IDCKR, INA240A2D extends common-mode range at the cost of higher supply current, while MAX40056ATA+T improves offset performance but sacrifices bidirectional capability-making INA185A2IDCKR the optimal balance of size, precision, and functional flexibility for 24-V embedded power systems.

Availability

INA185A2IDCKR is available at Aetrix Electronics and suitable for motor control, battery monitoring, and power management applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for INA185A2IDCKR 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 decades of expertise in precision signal conditioning and power management ICs.

The INA185 product line was designed specifically for compact, high-accuracy current sensing in space-constrained power electronics-targeting motor drives, battery systems, and renewable energy inverters where SOT-563 footprint and 26-V common-mode capability are essential.

FAQ

What is the maximum common-mode voltage supported by the INA185A2IDCKR?

The INA185A2IDCKR supports a common-mode input voltage range of –0.2 V to +26 V. This specification is independent of its 2.7 V to 5.5 V supply voltage, allowing it to accurately sense current on 24-V bus rails while operating from a low-voltage microcontroller supply. The device maintains specified performance across this full range at temperatures from –40°C to +125°C.

How does the REF pin enable bidirectional current sensing in the INA185A2IDCKR?

The REF pin sets the zero-current output reference level in the INA185A2IDCKR. When biased to VS/2 (e.g., 2.5 V with 5-V supply), the output centers at that voltage: positive differential inputs raise OUT above REF, and negative inputs lower OUT below REF. This enables true bidirectional measurement-critical for battery charge/discharge monitoring-without external op-amps or level-shifting circuitry.

Can the INA185A2IDCKR be used in high-side current sensing configurations?

Yes, the INA185A2IDCKR is explicitly designed for both high-side and low-side current sensing. Its –0.2 V to +26 V common-mode range permits direct connection to the high-voltage side of a shunt resistor-even when the device is powered from a lower supply (e.g., 3.3 V). No external level shifters or isolated supplies are required, simplifying layout and reducing BOM count.

What is the gain error specification for the INA185A2IDCKR, and how does it impact measurement accuracy?

The INA185A2IDCKR has a maximum gain error of ±0.2% over temperature (–40°C to +125°C) and supply voltage (2.7 V–5.5 V). This tight tolerance-enabled by its monolithic matched-resistor network-ensures that current measurements remain accurate without calibration across operating conditions. For a 50-mΩ shunt and 1-A load, this translates to <1-mA absolute error in reported current.

Is the INA185A2IDCKR pin-compatible with other variants in the INA185 family?

Yes, all INA185 variants-including INA185A1, INA185A2, INA185A3, and INA185A4-share identical pinout and SOT-563 package dimensions. The only differences are fixed gain (20/50/100/200 V/V) and corresponding bandwidth (350/210/150/105 kHz) and offset specs. This allows drop-in replacement during design iteration or performance tuning without PCB changes.