Texas Instruments INA186A2QDBVRQ1

Overview

INA186A2QDBVRQ1 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 50 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 INA186A2QDBVRQ1 datasheet, INA186A2QDBVRQ1 pinout, INA186A2QDBVRQ1 application, or INA186A2QDBVRQ1 equivalent, key selection criteria include its 40-V common-mode range with –0.2 V lower limit, 500 pA typical input bias current enabling µA-level sensing, and SOT-23-5 (DBV) package with unidirectional current measurement capability.

Technical Context

The INA186A2QDBVRQ1 uses a capacitively coupled front-end architecture to achieve 120 dB minimum CMRR and reject DC common-mode shifts up to 40 V - independent of its 1.7–5.5 V supply rail. Its zero-drift topology maintains ±50 µV offset and 0.5 µV/°C drift over temperature, enabling high-accuracy microamp-range measurements with larger sense resistors.

This device operates in unidirectional mode only (no REF or ENABLE pins), with IN+ and IN– inputs supporting both high-side and low-side shunt configurations. Output swings to GND + 1 mV and VS – 40 mV, ensuring full dynamic range utilization even at 1.8 V supply.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, surface-mount, lead-free, RoHS-compliant. No ENABLE or REF pins - unidirectional operation only.

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 INA186A2QDBVRQ1 uniquely balances AEC-Q100 Grade 1 compliance, 500 pA input bias for µA sensing, and SOT-23-5 footprint - making it optimal for space-constrained, battery-sensitive automotive modules requiring guaranteed automotive qualification.

Availability

INA186A2QDBVRQ1 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 across automotive production lifecycles.

Supply support for INA186A2QDBVRQ1 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 designing analog ICs, embedded processors, and digital signal solutions for automotive, industrial, and communications markets.

The INA186-Q1 product line targets high-precision, low-power current sensing in automotive battery-connected systems - specifically engineered for AEC-Q100 compliance, wide common-mode operation, and µA-level measurement fidelity.

FAQ

What is the maximum common-mode voltage the INA186A2QDBVRQ1 can withstand?

The INA186A2QDBVRQ1 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 load-dump events and cold-crank dips. The absolute maximum rating for VIN+ and VIN– pins is ±42 V with respect to GND, as specified in Section 6.1 of the datasheet.

Does the INA186A2QDBVRQ1 support bidirectional current sensing?

No, the INA186A2QDBVRQ1 in the SOT-23-5 (DBV) package does not support bidirectional current sensing because it lacks the REF pin. The REF node is internally tied to GND, limiting operation to unidirectional mode. Bidirectional capability requires the SC70-6 (DCK) or SOT-23-8 (DDF) packages, which expose the REF pin for external voltage biasing.

What is the gain accuracy and temperature drift of the INA186A2QDBVRQ1?

The INA186A2QDBVRQ1 has a maximum gain error of ±1% over temperature and a maximum gain drift of 10 ppm/°C. These specifications are guaranteed across the full operating range of –40°C to +125°C and ensure consistent current-to-voltage scaling regardless of thermal environment - critical for reliable fault detection in automotive under-hood applications.

Can the INA186A2QDBVRQ1 operate from a 1.8-V supply?

Yes, the INA186A2QDBVRQ1 operates from 1.7 V to 5.5 V, including 1.8-V nominal supplies. At 1.8 V, its output swings from GND +1 mV to VS –40 mV, preserving >97% of full-scale range for ADC interfacing. Quiescent current remains at 48 µA typical, and all key specs - including ±50 µV offset and 120 dB CMRR - are maintained across this supply range.

Is the INA186A2QDBVRQ1 pin-compatible with other devices in the INA186-Q1 family?

No, the INA186A2QDBVRQ1 (SOT-23-5) is not pin-compatible with other variants like the INA186A2QDCKRQ1 (SC70-6) or INA186A2QDDFRQ1 (SOT-23-8). Pin counts and functions differ: DBV has no REF or ENABLE pins, DCK adds REF, and DDF adds both REF and ENABLE. PCB layout must be specific to the DBV package's 5-pin configuration.