INA181A1IDBVR

Overview

The INA181A1IDBVR is a single-channel current-sense amplifier from Texas Instruments, designed for bidirectional current monitoring in low-voltage systems. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and supports a wide common-mode voltage range of -0.2 V to +26 V, independent of the supply voltage. The device features a fixed gain of 20 V/V with an integrated precision resistor network, ensuring high accuracy and minimal temperature drift. Key electrical specifications include a maximum input offset voltage of 100 µV, a typical common-mode rejection ratio (CMRR) of 100 dB, and a bandwidth of 350 kHz. It draws a typical supply current of 260 µA and functions reliably within an operating temperature range of -40°C to +125°C.

Feature Summary

• Bidirectional current sensing capability allows detection of both positive and negative currents relative to ground reference.
• Wide common-mode voltage range enables operation across various system voltages without requiring level shifting.
• Integrated matched resistor network provides fixed gain to minimize errors caused by external component tolerances.
• Low power consumption design supports battery-operated applications through reduced quiescent current.

Applications

• Battery management systems for monitoring charge and discharge currents
• Industrial process control loops requiring precise load current feedback
• Power distribution units for overcurrent protection and monitoring
• Motor driver circuits for phase current sensing and control

Procurement Notes

Verify the specific suffix 'IDBVR' corresponds to the SOT-23-6 package and tape-and-reel packaging format when ordering. Confirm that the A1 grade meets your required gain accuracy specifications, as different grades offer varying tolerance levels. Ensure compatibility with your PCB layout constraints regarding the small outline transistor package dimensions.

Selection Notes

Select this component when a fixed gain of 20 V/V is required for bidirectional current measurement. It is suitable for applications where the common-mode voltage exceeds the supply rail or goes slightly below ground. Consider the 350 kHz bandwidth for dynamic load changes and the low offset voltage for high-precision measurements using low-value shunt resistors.

Part Context

This part belongs to the INA181 family of current-sense amplifiers, which are optimized for cost-sensitive and space-constrained designs. The series offers multiple gain options and package variants to accommodate diverse system requirements while maintaining consistent performance characteristics such as high CMRR and low power consumption across the product line.

Replacement Considerations

Check for other members of the INA181 family with different gain settings if the 20 V/V gain does not match the application needs. Verify pinout compatibility before substituting with similar current-sense amplifiers from other manufacturers to ensure direct replacement without schematic modifications.