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INA181A3QDBVRQ1

TIINA181A3QDBVRQ1

Texas Instruments
Current Sense Amplifier 1 Circuit Rail-to-Rail SOT-23-6
Active3,366 in stock
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Overview

The INA181A3QDBVRQ1 is an AEC-Q100 qualified, bidirectional current-sense amplifier designed for high-side or low-side current monitoring in automotive systems. It features a fixed gain of 100V/V and supports a wide common-mode voltage range from -0.2V to 26V, operating on a single 2.7V to 5.5V supply. This functional safety-capable device integrates a matched resistor gain network to minimize gain error and temperature drift in a compact SOT-23-6 package.

Why Choose This Part

The device provides a high 150 kHz bandwidth and 2V/us slew rate, allowing for fast response to overcurrent conditions. Its bidirectional sensing capability enables monitoring of both charge and discharge cycles through a single shunt resistor, while the AEC-Q100 qualification ensures reliability across a -40C to 125C temperature range.

Applications

Automotive Motor Control
Monitoring phase currents in EPS, power windows, and sunroof motors for stall detection and control.
Battery Management Systems (BMS)
Tracking charge and discharge currents in automotive auxiliary batteries and low-voltage power rails.
ADAS Sensor Power Monitoring
Ensuring precision current delivery and fault detection for radar and camera modules.
DC/DC Converters
Implementing feedback loops for current-mode control and overcurrent protection in automotive power electronics.

Key Specifications

Slew Rate 2V/us
Output Type Rail-to-Rail
Mounting Type Surface Mount
Amplifier Type Current Sense
Package / Case SOT-23-6
Current - Supply 195uA
Number of Circuits 1
Current - Input Bias 75 uA
Operating Temperature -40degC ~ 125degC (TA)
Gain Bandwidth Product 150 kHz
Voltage - Input Offset 100 uV
Supplier Device Package SOT-23-6
Current - Output / Channel 8 mA
Voltage - Supply Span (Max) 5.5 V
Voltage - Supply Span (Min) 2.7 V

Getting Started

To evaluate this part, use the INA181EVM evaluation module which provides test points for shunt resistors and output monitoring. Ensure the REF pin is biased to half the supply voltage for bidirectional sensing, and place a decoupling capacitor close to the VDD pin for optimal noise performance.

Also Consider

MAX44284 Analog Devices - Provides ultra-low power consumption and a wider common-mode range up to 36V.