Texas Instruments INA186A5QDDFRQ1

Overview

INA186A5QDDFRQ1 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 500 V/V fixed gain, ±1% max gain error, ±50 µV max offset voltage, and operates from 1.7 V to 5.5 V supply across –40°C to +125°C ambient.

For engineers reviewing the INA186A5QDDFRQ1 datasheet, INA186A5QDDFRQ1 pinout, INA186A5QDDFRQ1 application, or INA186A5QDDFRQ1 equivalent, key selection criteria include its 500 V/V gain accuracy, 40-V common-mode range with 42-V survivability, picoamp input bias (500 pA typ), ENABLE functionality, and SC70/SOT-23 DDF package compatibility with bidirectional sensing via REF pin.

Technical Context

The INA186A5QDDFRQ1 employs a capacitively coupled front-end architecture enabling high common-mode rejection (120 dB min) independent of supply voltage, supporting accurate sensing at VCM = –0.2 V to +40 V - including automotive transients up to 42 V. Its zero-drift topology ensures low offset drift (0.5 µV/°C max) and enables microamp-level current measurement using larger sense resistors.

Integrated ENABLE pin (DDF package only) reduces quiescent current to 10 nA in shutdown while placing OUT in high-impedance state. The REF pin supports bidirectional operation by offsetting output voltage; when grounded or tied to VS, it configures unidirectional sensing. Gain is fixed at 500 V/V - no external resistor network required.

Key Specifications

Pinout & Package

INA186A5QDDFRQ1 is packaged in an 8-pin SOT-23 (DDF) variant measuring 2.90 mm × 1.60 mm, featuring ENABLE and REF pins for bidirectional control and power-saving shutdown. This package supports automotive thermal requirements with R_θJA = 164.6°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A5QDRQ1 and MAX40056ATA+T, the INA186A5QDDFRQ1 uniquely combines AEC-Q100 Grade 1 qualification, ENABLE-driven ultra-low standby power (<10 nA), REF-enabled bidirectional sensing, and DDF package size - making it optimal for cost-sensitive, safety-aware 12-V automotive current monitoring where board space and battery life are constrained.

Availability

INA186A5QDDFRQ1 is available at Aetrix Electronics and suitable for body control modules, telematics control units, and 12-V battery management systems requiring stable component supply across automotive production lifecycles.

Supply support for INA186A5QDDFRQ1 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 delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The INA186-Q1 product line targets high-precision, low-power current sensing in automotive subsystems - specifically engineered for AEC-Q100-compliant 12-V battery monitoring with picoamp input bias and ENABLE functionality.

FAQ

What is the maximum common-mode voltage the INA186A5QDDFRQ1 can withstand continuously?

The INA186A5QDDFRQ1 supports continuous operation at common-mode voltages from –0.2 V to +40 V. Its absolute maximum rating allows survival at 42 V - covering automotive load-dump transients without external protection. This makes the INA186A5QDDFRQ1 suitable for direct connection to 12-V battery rails in BCM and BMS applications where transient immunity is critical.

Does the INA186A5QDDFRQ1 support bidirectional current sensing, and how is it configured?

Yes, the INA186A5QDDFRQ1 supports bidirectional current sensing via its REF pin, which is present in the DDF package. To enable bidirectional operation, apply a mid-supply voltage (e.g., VS/2) to REF. A positive differential input (IN+ > IN−) yields V_OUT > V_REF; negative differential yields V_OUT < V_REF. The INA186A5QDDFRQ1's 500 V/V gain and ±50 µV offset ensure accurate zero-crossing detection for charge/discharge monitoring in 12-V BMS.

What is the role of the ENABLE pin on the INA186A5QDDFRQ1, and what happens when it is grounded?

The ENABLE pin on the INA186A5QDDFRQ1 controls device power state: driven to VS for normal operation, grounded to enter shutdown. When grounded, the INA186A5QDDFRQ1 draws ≤10 nA quiescent current and places the OUT pin in high-impedance state - isolating downstream circuitry. This feature is essential for minimizing standby power in eCall modules and other always-connected automotive subsystems relying on the INA186A5QDDFRQ1.

How does the 500 V/V gain option of the INA186A5QDDFRQ1 impact shunt resistor selection and measurement resolution?

The 500 V/V gain of the INA186A5QDDFRQ1 scales small shunt voltages to usable ADC ranges: for example, a 10-mΩ shunt at 2 A produces 20 mV differential, amplified to 10 V_OUT. With ±50 µV offset and 16-bit ADC, this enables ~5 mA resolution at 10-A full scale. The fixed gain eliminates resistor tolerance errors, and the 500 pA input bias permits use of higher-value shunts (e.g., 100 mΩ) for microamp-level current detection - a capability unique to the INA186A5QDDFRQ1 among AEC-Q100 amplifiers.

Is the INA186A5QDDFRQ1 qualified for automotive safety-critical systems, and what documentation supports functional safety design?

Yes, the INA186A5QDDFRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and explicitly labeled "Functional Safety-Capable." Texas Instruments provides FIT rate data, failure mode analysis (FMEA), and safety manual documentation to support ISO 26262 ASIL-B system integration. These resources - accessible via TI's product folder for INA186A5QDDFRQ1 - enable systematic hardware safety assessment without requiring additional external diagnostics, leveraging the INA186A5QDDFRQ1's inherent precision and stability.