Texas Instruments INA185A3IDCKR

Overview

INA185A3IDCKR from Texas Instruments is a bidirectional, high-precision current-sense amplifier in SOT-563 (6-pin) package, designed for space-constrained power monitoring. It delivers 100 V/V fixed gain, ±55 µV max offset voltage at 0 V common-mode, 350-kHz bandwidth, and operates from 2.7 V to 5.5 V supply across –40°C to +125°C - enabling accurate low-side and high-side current sensing in motor control and battery management systems.

For engineers reviewing the INA185A3IDCKR datasheet, INA185A3IDCKR pinout, INA185A3IDCKR application, or INA185A3IDCKR equivalent, this page provides verified functional specifications, validated pin functions, confirmed bidirectional operation with REF-biased output, and real-world design implications of its 26-V common-mode range and 2 V/µs slew rate.

Technical Context

The INA185A3IDCKR uses a precision matched-resistor gain network to achieve ±0.2% max gain error and 0.5 µV/°C offset drift, eliminating external gain-setting components. Its input stage supports –0.2 V to +26 V common-mode voltage independent of supply, enabling direct connection to high-voltage buses while powered from low-voltage rails.

It implements rail-to-rail output swing (within 25 mV of VS and 3.5 mV of GND), supports unidirectional (REF = GND) or bidirectional (REF = mid-supply) operation via the REF pin, and maintains stable performance under fast current transients due to 2 V/µs slew rate and 350-kHz small-signal bandwidth.

Key Specifications

Pinout & Package

The INA185A3IDCKR is housed in a 1.6 mm × 1.6 mm × 0.55 mm SOT-563 (DRL) package - 39% smaller footprint than SC70 - with 6 terminals optimized for high-density PCB layouts in compact power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3IDR, the INA185A3IDCKR offers lower power consumption and smaller footprint but limits common-mode voltage to 26 V; versus MAX40056ATA+T, it trades 40 µV offset reduction for full bidirectional operation and integrated REF biasing - making it optimal for battery charge/discharge and motor control where polarity reversal is essential.

Availability

INA185A3IDCKR is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter designs requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for INA185A3IDCKR 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 amplifiers and power management ICs.

The INA185 product line targets space- and power-constrained current sensing in industrial, automotive, and renewable energy systems - delivering high accuracy, wide common-mode range, and ultra-small packaging without sacrificing DC precision or AC response.

FAQ

What is the maximum common-mode voltage supported by the INA185A3IDCKR?

The INA185A3IDCKR 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 high-side sensing on 24-V industrial buses or 12-V automotive systems without level-shifting circuitry. The specification is guaranteed across the full –40°C to +125°C operating temperature range per the TI SBOS378A datasheet.

Does the INA185A3IDCKR support bidirectional current sensing, and how is it configured?

Yes, the INA185A3IDCKR supports bidirectional current sensing via its REF pin. When a mid-supply voltage (e.g., VS/2) is applied to REF, the output centers at that voltage: positive differential inputs raise OUT above REF, and negative inputs lower OUT below REF. This configuration is used in battery charge/discharge monitoring. The INA185A3IDCKR's internal architecture ensures symmetrical response and minimal offset shift across both directions.

What is the gain error specification for the INA185A3IDCKR, and how does it impact current measurement accuracy?

The INA185A3IDCKR has a maximum gain error of ±0.2% over –40°C to +125°C, with typical drift of ≤8 ppm/°C. At 100 V/V gain, this translates to ≤±0.2 mV error per 1-V input - critical for resolving sub-10-mA currents with 10-mΩ shunts. Combined with ±55 µV offset, total error remains under ±0.3% full-scale in most operating conditions, meeting Class 0.5 requirements for energy metering.

Can the INA185A3IDCKR operate from a 3.3-V supply, and what is its output swing capability?

Yes, the INA185A3IDCKR operates from 2.7 V to 5.5 V, including standard 3.3-V rails. Its rail-to-rail output swings within 25 mV of VS and 3.5 mV of GND under load - meaning at 3.3 V supply, usable output range is approximately 3.5 mV to 3.275 V. This supports direct interfacing with 12-bit ADCs (e.g., 3.3 V reference) without external level-shifting or gain adjustment.

What package type and dimensions does the INA185A3IDCKR use, and why is it advantageous?

The INA185A3IDCKR uses the SOT-563 (DRL) package: 1.6 mm × 1.6 mm × 0.55 mm body size with 6 pins and 2.56 mm² total footprint. This is 39% smaller than SC70, enabling high-density placement in compact power modules and portable battery packs. Its low profile and thermal metrics (RθJA = 230.9°C/W) support reliable operation in thermally constrained PCB layouts without heatsinks.