INA2321EA/250G4

Overview

The INA2321EA/250G4 is a high-side current monitor and power meter from Texas Instruments. It features an integrated precision shunt amplifier with a fixed gain of 25 V/V, designed for accurate measurement of voltage drops across low-value shunt resistors. The device includes a 12-bit analog-to-digital converter (ADC) that processes the amplified signal to provide digital readings of bus voltage, shunt voltage, and calculated power. It operates within a wide supply voltage range and supports I2C communication for data transfer to a host microcontroller.

Feature Summary

• Integrated high-side current sensing with fixed gain amplifier
• Built-in 12-bit ADC for direct digital conversion of measurements
• I2C-compatible serial interface for system integration

Applications

• Current monitoring in industrial automation systems
• Power management in battery-operated devices
• Overcurrent protection circuits in server backplanes

Procurement Notes

Verify the exact part number suffix against official Texas Instruments documentation to ensure correct gain configuration and package type. Confirm RoHS compliance status and lead-free manufacturing details through authorized distributors or the manufacturer's official ordering guide before procurement.

Selection Notes

Select this component when a fixed-gain solution is sufficient for the expected shunt voltage range. Ensure the system bus voltage does not exceed the device's absolute maximum ratings. Verify that the I2C address configuration meets the system's addressing requirements and that the required accuracy aligns with the integrated amplifier's specifications.

Part Context

This device belongs to the INA23xx family of current monitors. It shares functional similarities with other members but is distinguished by its specific fixed gain setting. The family is designed for applications requiring precise current and power monitoring without external amplification components.

Replacement Considerations

Check for pin-compatible alternatives such as the INA2321A series if different gain options are needed. Verify electrical parameter compatibility including common-mode voltage range and communication protocol support before substituting.