Texas Instruments INA186A3QDCKRQ1

Overview

INA186A3QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier with 100 V/V fixed gain, ±50 µV max offset voltage, 120 dB min CMRR, and bidirectional sensing capability enabled by its REF pin. It operates from 1.7 V to 5.5 V supply across –40°C to +125°C and is used in 12-V battery BMS for high-accuracy microamp-range current monitoring.

For engineers reviewing the INA186A3QDCKRQ1 datasheet, INA186A3QDCKRQ1 pinout, INA186A3QDCKRQ1 application, or INA186A3QDCKRQ1 equivalent, key selection factors include its picoamp input bias current (500 pA typ), 48 µA quiescent current, 35 kHz bandwidth at G=100, SC70-6 package compatibility, and functional safety documentation support for automotive systems.

Technical Context

The INA186A3QDCKRQ1 employs a capacitively coupled front-end architecture to achieve 120 dB minimum common-mode rejection and block DC common-mode voltages-enabling accurate sensing at –0.2 V to +40 V common-mode while powered from as low as 1.7 V. Its zero-drift topology delivers ±50 µV max offset and 0.5 µV/°C max drift, extending dynamic range for low-current measurement.

This SC70-6 variant includes REF and IN± pins for true bidirectional operation, unlike unidirectional SOT-23-5 (DBV) versions. The ENABLE function is absent-only present in DDF (SOT-23-8) packages-so INA186A3QDCKRQ1 remains always-on with 48 µA typical supply current and high-impedance output disabled state not supported.

Key Specifications

Pinout & Package

INA186A3QDCKRQ1 is packaged in SC70-6 (DCK) with 2.00 mm × 1.25 mm body size and wettable flank terminations. This package supports bidirectional sensing via dedicated REF and IN± terminals and excludes ENABLE functionality.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40010FAUA+, the INA186A3QDCKRQ1 provides lower offset drift (0.5 µV/°C), integrated bidirectionality via REF, and AEC-Q100 Grade 1 qualification-making it optimal for space-constrained, safety-critical automotive current monitoring where accuracy over temperature and functional safety documentation are mandatory.

Availability

INA186A3QDCKRQ1 is available at Aetrix Electronics and suitable for body control modules, telematics units, emergency call systems, and 12-V battery management systems requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for INA186A3QDCKRQ1 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, industrial, and power management solutions.

The INA186-Q1 product line delivers high-precision, low-power current sensing for automotive battery monitoring and subsystem protection-designed specifically to replace discrete op-amp solutions in AEC-Q100-compliant systems.

FAQ

What is the gain setting of the INA186A3QDCKRQ1?

The INA186A3QDCKRQ1 has a fixed gain of 100 V/V, as indicated by the "A3" suffix in its part number. This gain is laser-trimmed during manufacturing and specified with ±1% maximum gain error over temperature. It is optimized for applications requiring high sensitivity with moderate bandwidth-such as 12-V BMS current monitoring using 10 mΩ shunts-where 100× amplification converts 10 mA of load current into a 100 mV output signal.

Does the INA186A3QDCKRQ1 support bidirectional current sensing?

Yes, the INA186A3QDCKRQ1 supports bidirectional current sensing because it is packaged in SC70-6 (DCK), which includes both REF and IN± pins. Applying a mid-supply voltage (e.g., VS/2) to the REF pin centers the output voltage, allowing positive differential inputs (IN+ > IN−) to raise OUT above REF and negative inputs to pull OUT below REF. This capability is confirmed in the device's Functional Block Diagram and Pin Functions table for DCK package variants.

What is the maximum common-mode voltage the INA186A3QDCKRQ1 can handle?

The INA186A3QDCKRQ1 supports a common-mode input voltage range of –0.2 V to +40 V, with absolute maximum survivability up to 42 V. This specification is independent of supply voltage (VS), enabling direct connection to automotive 12-V battery rails-even during load dump events-without external protection circuitry. The value is explicitly stated in the Recommended Operating Conditions table and validated across the full –40°C to +125°C temperature range.

Is the ENABLE pin available on the INA186A3QDCKRQ1?

No, the ENABLE pin is not available on the INA186A3QDCKRQ1. It is exclusive to the DDF (SOT-23-8) package variant, as documented in the Pin Configuration and Functions section. The SC70-6 (DCK) package used by INA186A3QDCKRQ1 contains six pins: REF, OUT, GND, VS, IN+, and IN−-with no ENABLE terminal. Therefore, the device operates continuously when powered and does not support shutdown mode or high-impedance output disable.

What packaging and thermal characteristics apply to the INA186A3QDCKRQ1?

The INA186A3QDCKRQ1 uses the SC70-6 (DCK) package with nominal dimensions of 2.00 mm × 1.25 mm. Its thermal metrics include a junction-to-ambient resistance (RθJA) of 170.7°C/W and junction-to-board resistance (RθJB) of 65.3°C/W, as published in the Thermal Information table. These values are measured per JEDEC standards and confirm suitability for surface-mount reflow assembly on standard FR-4 PCBs with minimal copper pour-critical for compact BCM and telematics designs.