Texas Instruments INA186A1QDDFRQ1

Overview

INA186A1QDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier optimized for bidirectional 12-V battery monitoring in body control modules and telematics units. It delivers 25 V/V fixed gain, ±50 µV max offset voltage, 120 dB min CMRR, and operates from 1.7 V to 5.5 V supply across –40°C to +125°C ambient.

For engineers reviewing the INA186A1QDDFRQ1 datasheet, INA186A1QDDFRQ1 pinout, INA186A1QDDFRQ1 application, or INA186A1QDDFRQ1 equivalent, key selection criteria include its 500 pA typical input bias current enabling µA-level current sensing, ENABLE pin for low-power duty cycling, REF pin for bidirectional operation, and SC70/SOT-23 DDF package compatibility with automotive layout constraints.

Technical Context

The INA186A1QDDFRQ1 uses a capacitively coupled front-end architecture to achieve high common-mode rejection (120 dB min) while supporting –0.2 V to +40 V input common-mode voltage independent of 1.7–5.5 V supply. Its zero-drift topology maintains ±50 µV offset and 0.5 µV/°C drift over temperature.

This device implements bidirectional sensing via external REF voltage biasing and features an ENABLE pin that reduces quiescent current to 10 nA in shutdown while placing OUT in high-impedance state-critical for low-duty-cycle automotive BMS and eCall systems requiring microamp-level system sleep current.

Key Specifications

Pinout & Package

The INA186A1QDDFRQ1 is packaged in an 8-pin SOT-23 (DDF) variant measuring 2.90 mm × 1.60 mm, featuring ENABLE and REF pins for bidirectional sensing and power-gating control.

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 INA186A1QDDFRQ1 uniquely balances ultra-low input bias current (500 pA), integrated ENABLE functionality, AEC-Q100 Grade 1 qualification, and REF-based bidirectionality-making it optimal for cost-sensitive, low-power 12-V automotive current monitoring where µA-level accuracy and sleep-mode efficiency are essential.

Availability

INA186A1QDDFRQ1 is available at Aetrix Electronics and suitable for body control modules, telematics control units, emergency call systems, and 12-V battery management systems requiring stable component supply across automotive production lifecycles.

Supply support for INA186A1QDDFRQ1 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 precision analog solutions.

The INA186-Q1 product line was designed specifically for AEC-Q100-compliant, low-power, high-accuracy current sensing in 12-V automotive subsystems-including BCM, telematics, and battery monitoring-where picoamp input bias and ENABLE-controlled sleep current are critical.

FAQ

What is the maximum common-mode voltage the INA186A1QDDFRQ1 can withstand?

The INA186A1QDDFRQ1 supports a continuous common-mode input range of –0.2 V to +40 V and survives transient voltages up to +42 V. This makes it suitable for direct connection to automotive 12-V battery rails, including during load-dump events. The absolute maximum rating for VIN+ and VIN– pins is 42 V with respect to GND, as specified in Section 6.1 of the official datasheet.

Does the INA186A1QDDFRQ1 support bidirectional current sensing, and how is it implemented?

Yes, the INA186A1QDDFRQ1 supports bidirectional current sensing via its dedicated REF pin, which accepts an external reference voltage (0 V to VS). When a differential voltage is applied across IN+ and IN–, the output becomes V_OUT = GAIN × (IN+ − IN−) + V_REF. A positive differential input raises V_OUT above V_REF; a negative differential input lowers it below V_REF. This feature is available only in DDF and SC70 packages-not in the 5-pin SOT-23 (DBV) variant.

What is the purpose of the ENABLE pin on the INA186A1QDDFRQ1, and what happens when it is asserted low?

The ENABLE pin on the INA186A1QDDFRQ1 controls device power state: driving it to VS enables normal operation, while pulling it to GND disables the amplifier. In shutdown, the INA186A1QDDFRQ1 draws only 10 nA typical quiescent current and places the OUT pin in high-impedance state-preventing loading of downstream circuitry. This capability is essential for minimizing average power in battery-monitoring applications with intermittent sampling intervals.

How does the input bias current of the INA186A1QDDFRQ1 compare to conventional current-sense amplifiers, and why does it matter?

The INA186A1QDDFRQ1 specifies 500 pA typical input bias current-two to three orders of magnitude lower than typical current-sense amplifiers (often >10 nA). This enables accurate measurement of very low currents (e.g., µA-range leakage) using high-value sense resistors without introducing significant I_B×R error. It also allows effective use of RC input filters for EMI suppression without degrading DC accuracy-a key advantage in noisy automotive environments.

What package type is used for the INA186A1QDDFRQ1, and what are its key mechanical characteristics?

The INA186A1QDDFRQ1 uses the 8-pin SOT-23 (DDF) package, with nominal body dimensions of 2.90 mm × 1.60 mm and a maximum height of 1.30 mm. This package integrates both the ENABLE and REF pins required for bidirectional, low-power automotive current sensing. It is RoHS-compliant, moisture sensitivity level 1 (MSL-1), and qualified per AEC-Q100 Grade 1 for –40°C to +125°C operation.