INA281B1IDBVR

Overview

The INA281B1IDBVR is a high-precision current sense amplifier manufactured by Texas Instruments, designed for applications requiring accurate measurement of differential voltages across shunt resistors. It operates with a common-mode voltage range from -4 V to 110 V and supports a supply voltage between 2.7 V and 20 V. The device features a fixed gain of 50 V/V, a gain bandwidth product of 1.3 MHz, and a slew rate of 2.5 V/µs. Key electrical specifications include an input offset voltage of 100 µV, an input bias current of 20 µA, and a common-mode rejection ratio (CMRR) of 120 dB. It consumes 1.5 mA of operating current and is housed in a SOT-23-5 package.

Feature Summary

• Provides high-precision current sensing with a fixed gain of 50 V/V for direct ADC interfacing
• Supports wide common-mode voltage operation ranging from -4 V to 110 V
• Delivers high accuracy with low input offset voltage and high common-mode rejection ratio

Applications

• High-side current monitoring in industrial automation systems
• Battery management systems in electric vehicles and energy storage
• Motor control circuits requiring precise phase current measurement
• Power supply overcurrent protection and load management

Procurement Notes

Verify the specific suffix 'B1' against official Texas Instruments documentation to confirm the exact gain setting and tolerance class, as variations exist within the INA281 family. Ensure the SOT-23-5 package type matches your PCB footprint requirements. Cross-reference the datasheet revision date to ensure compliance with current RoHS standards and material declarations before finalizing procurement orders.

Selection Notes

Select this component when a fixed gain of 50 V/V is required for high-side current sensing applications. It is suitable for designs needing a wide common-mode voltage range up to 110 V while maintaining high precision. Consider the SOT-23-5 package size for space-constrained layouts. Verify that the 1.3 MHz bandwidth and 100 µV offset voltage meet the system's accuracy and speed requirements.

Part Context

The INA281 series consists of high-precision, wide-bandwidth current sense amplifiers designed for demanding industrial and automotive applications. These devices offer various gain options and are optimized for accurate measurement in noisy environments. The INA281B1IDBVR represents a specific variant within this family, characterized by its fixed gain configuration and compact surface-mount packaging, catering to modern electronic design constraints.

Replacement Considerations

Check for other variants in the INA281 family with different gain settings or packages if the 50 V/V gain is not optimal. Verify compatibility with alternative current sense amplifiers from Texas Instruments or other manufacturers, ensuring similar common-mode voltage ranges and precision levels.