INA281B2IDBVR

Overview

The INA281B2IDBVR is a high-precision current sense amplifier from Texas Instruments, designed for applications requiring accurate measurement in high-voltage environments. It operates with a common-mode voltage range of -4 V to 110 V and features a gain bandwidth product of 1.3 MHz. The device offers a fixed gain of 20 V/V, an input offset voltage of 55 µV, and a common-mode rejection ratio of 140 dB. It functions within a supply voltage range of 2.7 V to 20 V, consuming 1.5 mA of operating current. The component is housed in a SOT-23-5 package and supports an extended operating temperature range from -40°C to +125°C.

Feature Summary

• Provides high-precision current sensing capabilities with a wide common-mode voltage range extending up to 110 V.
• Features a high common-mode rejection ratio of 140 dB to ensure accurate measurements in noisy environments.
• Delivers fast transient response with a 1.3 MHz gain bandwidth product for dynamic signal processing.

Applications

• Industrial motor control systems
• Power supply monitoring circuits
• Battery management systems

Procurement Notes

Verify the specific suffix IDBVR against official Texas Instruments documentation to confirm the reel packaging configuration and tape-and-reel specifications. Ensure the B-grade accuracy class matches the design requirements for offset voltage and gain error. Cross-reference the datasheet revision date to confirm compliance with current RoHS standards and material declarations before finalizing procurement orders.

Selection Notes

Select this component when a fixed 20 V/V gain is required for unidirectional current sensing in high-side configurations. The B-grade variant offers tighter performance tolerances compared to standard grades, making it suitable for precision instrumentation. Consider the SOT-23-5 footprint constraints and thermal dissipation characteristics during PCB layout planning to ensure reliable operation across the specified temperature range.

Part Context

This part belongs to the INA281 family of current sense amplifiers, which are engineered for robust performance in demanding industrial and automotive applications. The series is characterized by its ability to handle high common-mode voltages while maintaining low noise and high linearity. The INA281B2IDBVR represents a specific grade and package option within this lineup, optimized for compact designs requiring precise current monitoring.

Replacement Considerations

Direct substitutes include other INA281 variants such as INA281A2IDBVR or INA281Q2IDBVR, depending on the required accuracy grade and automotive qualification status. Verify that alternative parts maintain the same 20 V/V gain and SOT-23-5 package to ensure pin compatibility without circuit redesign.