Texas Instruments INA185A4IDRLR

Overview

INA185A4IDRLR from Texas Instruments is a bidirectional, high-precision current sense amplifier optimized for space-constrained, cost-sensitive applications. It features 200 V/V fixed gain, ±100 µV maximum offset at 12 V common-mode voltage, 350-kHz bandwidth, –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 INA185A4IDRLR datasheet, INA185A4IDRLR pinout, INA185A4IDRLR application, or INA185A4IDRLR equivalent, this page delivers verified specifications, validated SOT-563 package details, confirmed bidirectional sensing behavior, and real-world design context for precision current measurement under wide common-mode conditions.

Technical Context

The INA185A4IDRLR implements a matched-resistor gain network for fixed 200 V/V amplification, minimizing gain error drift (≤8 ppm/°C) and enabling stable RTI offset performance across temperature. Its proprietary topology supports operation with input common-mode voltages exceeding the 2.7–5.5 V supply rail-critical for high-side sensing in 24-V industrial buses.

It delivers 2 V/µs slew rate and rail-to-rail output swing (within 25 mV of VS and 3.5 mV of GND), ensuring fast transient response and full dynamic range utilization when interfacing with 12-bit+ ADCs in real-time motor control loops or battery protection ICs.

Key Specifications

Pinout & Package

SOT-563 (DRL) 6-pin ultra-small surface-mount package measuring 1.6 mm × 1.6 mm × 0.55 mm - 39% smaller footprint than SC70, optimized for dense PCB layouts in compact power modules and battery packs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA185A4IDRLR, INA240A4DR offers greater common-mode robustness but sacrifices miniaturization, while MAX40056AUB+ delivers faster response at the cost of power efficiency and package size-making INA185A4IDRLR optimal for space- and power-constrained 24-V systems demanding precision and integration.

Availability

INA185A4IDRLR is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.

Supply support for INA185A4IDRLR 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 cost-sensitive, space-constrained current sensing in industrial, automotive, and energy systems-emphasizing integrated gain networks, ultra-small packaging, and wide common-mode operation without external components.

FAQ

What is the maximum common-mode voltage the INA185A4IDRLR can handle?

The INA185A4IDRLR supports a common-mode input voltage range of –0.2 V to +26 V, independent of its 2.7–5.5 V supply voltage. This allows direct connection to 24-V industrial buses or battery stacks without level-shifting circuitry. The specification is validated across the full –40°C to +125°C operating temperature range and applies to both high-side and low-side configurations. Exceeding +26 V may cause permanent damage per absolute maximum ratings.

Does the INA185A4IDRLR support bidirectional current sensing, and how is it configured?

Yes, the INA185A4IDRLR supports true bidirectional current sensing via its REF pin. Applying a DC bias voltage (e.g., VS/2) to REF establishes the zero-current output level; positive differential input (IN+ > IN–) drives OUT above REF, while negative differential input drives OUT below REF. This configuration is essential for battery charge/discharge monitoring. The device does not require external switches or dual supplies-bidirectional operation is inherent and fully specified in the electrical characteristics table.

What is the gain error specification for the INA185A4IDRLR, and how does it vary with temperature?

The INA185A4IDRLR has a maximum gain error of ±0.25% over –40°C to +125°C, with typical drift of 1.5–8 ppm/°C. This is explicitly documented in Section 5.5 Electrical Characteristics of the SBOS378A datasheet. The matched internal resistor network minimizes temperature-induced gain variation, making it significantly more stable than discrete op-amp + external resistor solutions. Gain error remains bounded across full output swing (0.5 V to VS – 0.5 V) and common-mode voltage range.

Can the INA185A4IDRLR be used in low-side sensing applications with very small shunt resistors?

Yes-the INA185A4IDRLR's ±100 µV maximum offset at 12 V common-mode enables accurate low-side sensing with shunt resistors as low as 1 mΩ. At 1-A load, a 1-mΩ shunt yields only 1-mV drop; with 200 V/V gain, that produces 200-mV output-well above the offset-induced error floor. Its 0.5 µV/°C offset drift further ensures stability across temperature, reducing calibration burden in battery pack monitors where shunt self-heating occurs.

What package type is used for the INA185A4IDRLR, and what are its key mechanical dimensions?

The INA185A4IDRLR uses the DRL package: a 6-pin SOT-563 variant measuring 1.60 mm × 1.60 mm × 0.55 mm (body only), with total footprint including pins at 2.56 mm². This is 39% smaller than the SC70 option and optimized for automated assembly in high-density power modules. Pin pitch is 0.5 mm, and the package is RoHS-compliant and halogen-free per TI's packaging standards.