INA281B4IDBVR

Overview

The INA281B4IDBVR is a high-precision current sense amplifier from Texas Instruments, designed for bidirectional current sensing in systems with common-mode voltages ranging from -4 V to 110 V. It features a fixed gain of 200 V/V and operates on a single supply voltage between 2.7 V and 20 V. Key electrical specifications include a maximum input offset voltage of 30 µV, an input bias current of 20 µA, and a gain error of 0.07%. The device offers a common-mode rejection ratio (CMRR) of 140 dB and a gain-bandwidth product of 900 kHz. It consumes 1.5 mA of supply current and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Provides high-precision bidirectional current measurement with low gain error and high common-mode rejection.
• Supports wide common-mode voltage range from negative to positive potentials without external level shifting.
• Delivers fast transient response with a settling time of 1 µs and a slew rate of 2.5 V/µs.

Applications

• Industrial motor drives and control systems
• Power supply output current monitoring
• Battery management systems in electric vehicles

Procurement Notes

Verify the specific suffix IDBVR corresponds to the SOT-23-5 package and tape-and-reel orientation required for your assembly line. Confirm that the B-grade accuracy meets your system's tolerance requirements compared to other grades in the INA281 family. Ensure the operating environment stays within the specified -40°C to +125°C junction temperature limits to maintain performance stability.

Selection Notes

Select this component when high accuracy is critical in high-voltage common-mode environments. The fixed 200 V/V gain simplifies design by reducing the need for external precision resistors. Consider the SOT-23-5 package size constraints and thermal dissipation capabilities, as power dissipation reaches 250 mW under certain conditions. Compare against A-grade variants if lower cost is prioritized over tighter gain error specifications.

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 family shares core architecture but varies in accuracy grades and automotive qualification status. The INA281 series is notable for its ability to handle high common-mode voltages while maintaining low noise and high CMRR, making it suitable for precise energy metering and protection circuits.

Replacement Considerations

The INA281A4IDBVR is a non-automotive grade alternative with similar electrical characteristics but higher gain error (0.5%). The INA281B4IDBVT is the same functional device packaged in a DSBGA format instead of SOT-23-5. Verify pinout compatibility and thermal performance when substituting these parts.