INA310A3IDGKR

Overview

The INA310A3IDGKR is a Texas Instruments ultra-precise current sense amplifier featuring a fixed gain of 100 V/V. It operates with a common-mode voltage range from -4 V to +110 V and supports supply voltages between 2.7 V and 20 V. The device provides a signal bandwidth of 1.3 MHz, a slew rate of 2.5 V/µs, and a typical CMRR of 160 dB. Key electrical specifications include a maximum offset voltage of ±50 µV, a maximum gain error of 0.15%, and a quiescent current of 1.6 mA. It integrates an open-drain comparator with a 0.6 V internal reference.

Feature Summary

• Ultra-precision architecture delivering low offset voltage and minimal drift for accurate high-voltage measurements
• Integrated open-drain comparator with latching capability and internal 0.6 V threshold for fast overcurrent protection
• Wide common-mode input range independent of the power supply voltage
• High-speed response with 1.3 MHz bandwidth and short propagation delay

Applications

• 48 V DC/DC converter systems
• 48 V battery management systems (BMS)
• Macro remote radio units (RRU)
• 48 V rack server power supplies
• Solenoids and actuators control

Procurement Notes

Verify the specific suffix IDGKR corresponds to the VSSOP-8 package configuration required for your PCB layout. Confirm that the 'A' grade designation meets your precision requirements, as it offers tighter offset and gain error tolerances compared to the 'B' grade. Ensure the operating environment stays within the specified -40°C to +125°C temperature range for guaranteed performance.

Selection Notes

Select this component when a fixed 100 V/V gain is optimal for your shunt resistor value and desired output swing. The wide common-mode range allows flexibility in both high-side and low-side sensing topologies without being constrained by the local supply voltage. Consider the integrated comparator if system-level overcurrent detection latency is a critical design parameter.

Part Context

This part belongs to the INA310x family of ultra-precise current sense amplifiers. The 'A3' designation indicates the 'A' accuracy grade with a fixed gain of 100 V/V. The 'DGKR' suffix specifies the 8-pin VSSOP package in a tape-and-reel format. This series is designed for applications requiring high bandwidth and precision in harsh electrical environments.

Replacement Considerations

INA310A2IDGKR: Offers a different fixed gain of 50 V/V while maintaining similar precision and package.

FAQ

How does the RESET pin affect the comparator operation?

When the RESET pin is left open or grounded, the comparator operates in transparent mode. When pulled high, it enters latching mode, keeping the output high until reset.

Is the common-mode voltage range dependent on the supply voltage?

No, the INA310A3IDGKR can measure common-mode voltages from -4 V to +110 V regardless of the VS supply voltage, which ranges from 2.7 V to 20 V.