INA296A1IDR

Overview

The INA296A1IDR is a bidirectional, ultra-precise current sense amplifier from Texas Instruments. It measures voltage drops across shunt resistors over a wide common-mode range of -5V to 110V, independent of the supply voltage. The device features a fixed gain of 10V/V and operates on a single 2.7V to 20V supply with a typical quiescent current of 2.5mA. Key electrical specifications include a maximum offset voltage of ±20µV, a maximum gain error of ±0.01%, and a common-mode rejection ratio (CMRR) of 166dB. It offers a small-signal bandwidth of 1.1MHz and a slew rate of 8V/µs, ensuring fast transient detection.

Feature Summary

• Ultra-precise zero-drift topology for high accuracy measurements
• Wide common-mode voltage range extending beyond supply voltage
• High-speed response with 1.1MHz bandwidth and 8V/µs slew rate
• Configurable output via reference pins for unidirectional or bidirectional operation

Applications

• 48V DC/DC converters
• 48V battery management systems (BMS)
• Test and measurement equipment
• Macro remote radio units (RRU)
• 48V rack server power supplies

Procurement Notes

Verify the specific suffix IDR corresponds to the SOIC-8 package when sourcing. Confirm that the A1 designation matches the required 10V/V gain for your circuit design. Ensure the operating environment stays within the specified -40°C to +125°C temperature range. Check for moisture sensitivity levels if reflow soldering is planned. Validate that the supply voltage remains between 2.7V and 20V during operation.

Selection Notes

Select this component when high precision is required for bidirectional current sensing in high-voltage environments. The 10V/V gain is suitable for applications where the shunt voltage drop is relatively large compared to the desired output dynamic range. Consider the 1.1MHz bandwidth for fast overcurrent protection circuits. The low input bias current minimizes errors in high-impedance sensing paths. Compare against other gains if smaller shunt voltages require higher amplification.

Part Context

This part belongs to the INA296x family of ultra-precise current sense amplifiers. The 'A' variant denotes the highest precision grade with minimal drift. The '1' indicates a fixed gain of 10V/V. The 'IDR' suffix specifies the surface-mount SOIC-8 package. This series is designed for applications requiring accurate monitoring of high-side, inline, or low-side currents in industrial and automotive systems.

Replacement Considerations

Other members of the INA296A family offer different fixed gains (INA296A2 at 20V/V, INA296A3 at 50V/V, etc.). If a different gain is needed, select the corresponding number suffix while keeping the 'A' precision grade. For automotive applications, consider the INA296A-Q1 variants which are AEC-Q100 qualified.