Texas Instruments INA186A3QDDFRQ1

Overview

INA186A3QDDFRQ1 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 100 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 INA186A3QDDFRQ1 datasheet, INA186A3QDDFRQ1 pinout, INA186A3QDDFRQ1 application, or INA186A3QDDFRQ1 equivalent, key selection factors include its 500 pA typical input bias current enabling µA-range sensing, ENABLE pin for low-power duty cycling, REF pin for bidirectional operation, and SC70/SOT-23 DDF package compatibility with automotive PCB layouts.

Technical Context

The INA186A3QDDFRQ1 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 ensures 0.5 µV/°C max offset drift and ±1% max gain error over temperature.

This device implements true bidirectional sensing via externally applied REF voltage (0 V to VS), enabling output swing above and below reference level. The ENABLE pin (DDF package only) reduces quiescent current to 10 nA in shutdown while placing OUT in high-impedance state-critical for intermittent BMS monitoring.

Key Specifications

Pinout & Package

The INA186A3QDDFRQ1 is packaged in an 8-pin SOT-23 (DDF) variant measuring 2.90 mm × 1.60 mm, featuring ENABLE and REF pins for bidirectional operation and power gating.

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 INA186A3QDDFRQ1 uniquely combines 100 V/V gain, ENABLE pin, REF pin, and AEC-Q100 Grade 1 qualification in an 8-pin SOT-23-making it the only option for space-constrained, low-power, bidirectional automotive BMS nodes requiring integrated enable control.

Availability

INA186A3QDDFRQ1 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 INA186A3QDDFRQ1 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 bidirectional current sensing in 12-V automotive subsystems-including BCM, telematics, and BMS-where low bias current, wide common-mode range, and enable-controlled power gating are essential.

FAQ

What is the maximum common-mode voltage the INA186A3QDDFRQ1 can withstand?

The INA186A3QDDFRQ1 supports a continuous common-mode input range of –0.2 V to +40 V and has an absolute maximum rating of 42 V on IN+ and IN– pins. This allows direct connection to automotive 12-V battery rails while surviving load-dump transients up to 42 V without damage or performance degradation-verified per AEC-Q100 stress testing protocols.

Does the INA186A3QDDFRQ1 support bidirectional current sensing, and how is it implemented?

Yes, the INA186A3QDDFRQ1 supports bidirectional current sensing via its dedicated REF pin. When a reference voltage (0 V to VS) is applied to REF, the output becomes VOUT = G×(IN+−IN−) + VREF. A positive differential input produces VOUT > VREF; a negative differential input yields VOUT < VREF-enabling signed current measurement in 12-V BMS applications without external op-amps or level shifters.

What is the purpose of the ENABLE pin on the INA186A3QDDFRQ1, and what happens when it is asserted low?

The ENABLE pin on the INA186A3QDDFRQ1 controls power state: driving it to VS enables normal operation (48 µA IQ), while pulling it to GND disables the amplifier, reducing supply current to 10 nA typical and placing the OUT pin in high-impedance state. This feature is critical for low-duty-cycle monitoring in eCall and sleep-mode BMS applications where average power must remain below 1 µA.

How does the low input bias current of 500 pA benefit system design with the INA186A3QDDFRQ1?

The 500 pA typical input bias current of the INA186A3QDDFRQ1 minimizes voltage error across high-value sense resistors, enabling accurate measurement of sub-milliamp currents-such as standby leakage in BCM modules. It also allows use of RC input filters without degrading DC accuracy, improving immunity to high-frequency noise from switching regulators and CAN transceivers in automotive environments.

What package type is used for the INA186A3QDDFRQ1, and why is it suitable for automotive PCB layouts?

The INA186A3QDDFRQ1 uses the 8-pin SOT-23 (DDF) package (2.90 mm × 1.60 mm), which provides mechanical robustness, thermal performance (RθJA = 164.6°C/W), and compatibility with standard automotive reflow profiles. Its pinout includes dedicated ENABLE and REF terminals-eliminating need for discrete logic or external references-and supports automated optical inspection and X-ray void detection required for AS9100-compliant manufacturing.