INA281A3IDBVR

Overview

The INA281A3IDBVR is a high-precision current-sense amplifier manufactured by Texas Instruments. It operates with a supply voltage range of 2.7 V to 20 V and supports bidirectional current sensing within a common-mode voltage range of -4 V to 110 V. The device features a fixed gain of 50 V/V, a gain bandwidth product of 1.3 MHz, and a maximum input offset voltage of 100 µV. It draws a typical operating supply current of 1.5 mA and is housed in a SOT-23-5 package.

Feature Summary

• Supports bidirectional current sensing with a wide common-mode voltage range extending from -4 V to 110 V.
• Provides high precision with a low maximum input offset voltage of 100 µV and a gain bandwidth product of 1.3 MHz.
• Operates on a single supply voltage ranging from 2.7 V to 20 V with a low typical supply current of 1.5 mA.

Applications

• High-side or low-side current monitoring in industrial automation systems
• Battery management and protection circuits in portable devices
• Overcurrent protection in power distribution units

Procurement Notes

Verify the specific suffix IDBVR corresponds to the SOT-23-5 surface-mount package and standard commercial grade temperature rating. Confirm that the A3 designation matches the required 50 V/V fixed gain for your circuit design. Ensure compatibility with your board layout constraints regarding the small outline transistor package dimensions.

Selection Notes

Select this component when a wide common-mode voltage range up to 110 V is required alongside high accuracy. The 1.3 MHz bandwidth suits applications needing faster response times than lower-frequency amplifiers. The fixed 50 V/V gain simplifies resistor selection while maintaining signal integrity for small differential voltages across sense resistors.

Part Context

This part belongs to the INA281 family of current-sense amplifiers designed for high-voltage applications. The series offers various gain options and packages to accommodate different system requirements. The INA281A3IDBVR specifically targets cost-sensitive designs requiring precise measurement in environments with high common-mode potentials.

Replacement Considerations

Check for direct pin-compatible alternatives within the INA281 family such as other gain variants like INA281A1IDBVR or INA281A4IDBVR. Verify if automotive-grade versions like INA281B4QDBVRQ1 are suitable if higher reliability standards are needed.