INA281B5IDBVR

Overview

The INA281B5IDBVR 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 supports a supply voltage between 2.7 V and 20 V. The device features a fixed gain of 50 V/V, a bandwidth of 1.3 MHz, and a low input offset voltage of 100 µV. Packaged in a compact SOT-23-5 format, it offers a common-mode rejection ratio (CMRR) of 90 dB and consumes only 1.5 mA of supply current, making it suitable for space-constrained designs.

Feature Summary

• Supports bidirectional current sensing with a wide common-mode voltage range extending up to 110 V.
• Delivers high precision with a maximum input offset voltage of 100 µV and low drift characteristics.
• Provides a fixed gain of 50 V/V to simplify circuit design while maintaining a 1.3 MHz bandwidth.
• Features a compact SOT-23-5 package optimized for surface-mount assembly in limited board areas.

Applications

• Industrial motor drives and control systems
• Power supply current monitoring
• Battery management systems
• Inverter and converter circuits

Procurement Notes

Verify the specific suffix 'B5' against the official datasheet to confirm the fixed gain value, as variations exist within the family. Ensure the operating environment stays within the specified temperature range of -40°C to +125°C. Confirm that the required common-mode voltage does not exceed the 110 V limit. Check for AEC-Q100 qualification if automotive reliability standards are mandatory for the application.

Selection Notes

Select this component when a fixed gain of 50 V/V is required for high-side or low-side sensing. It is appropriate for designs needing a balance between high bandwidth and precision. Consider alternatives like the INA281A series if lower offset voltage is critical, or the INA281B4 if higher CMRR is needed. Evaluate the SOT-23-5 thermal performance for the expected power dissipation levels.

Part Context

This part belongs to the INA281 family of current-sense amplifiers, which are engineered for robust performance in harsh electrical environments. The family shares a common architecture supporting wide common-mode voltages but varies in gain options and precision grades. The 'B' grade typically indicates specific offset voltage and drift specifications compared to other grades in the lineup.

Replacement Considerations

Compatible substitutes include other parts from the INA281 family such as INA281A4IDBVR or INA281B4IDBVR, depending on whether gain or CMRR requirements differ. Verify pin compatibility and thermal characteristics before substitution.