INA310A1IDGKR

Overview

The INA310A1IDGKR is a Texas Instruments ultra-precise current sense amplifier featuring a fixed gain of 20 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 offers a signal bandwidth of 1.3 MHz, a slew rate of 2.5 V/µs, and a typical CMRR of 160 dB. Key electrical characteristics include a maximum offset voltage of ±30 µV, a maximum gain error of 0.15%, and a quiescent current of 1.6 mA. It is housed in an 8-pin VSSOP package.

Feature Summary

• Ultra-precise zero-drift architecture for high accuracy across wide temperature ranges
• Integrated open-drain comparator with internal 0.6-V reference and latching capability
• Wide common-mode input range independent of the power supply voltage
• High-speed response with 1.3-MHz bandwidth for fast overcurrent protection

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 tape-and-reel packaging configuration. Confirm that the 'A' grade designation matches the required precision specifications, specifically the ±30 µV offset voltage and 0.15% gain error limits. Ensure the operating environment remains within the specified -40°C to +125°C temperature range for guaranteed performance.

Selection Notes

Select this component when a fixed 20 V/V gain is optimal for the target shunt resistor value and expected current levels. The wide common-mode range allows flexibility in both high-side and low-side sensing topologies without being constrained by the local supply voltage. The integrated comparator simplifies design by removing the need for external threshold detection circuits.

Part Context

This part belongs to the INA310x family of ultra-precise current sense amplifiers. It shares the same core topology and comparator features as other variants but is distinguished by its fixed 20 V/V gain setting. Other family members offer gains of 50, 100, 200, or 500 V/V to accommodate different dynamic range requirements while maintaining identical precision and bandwidth characteristics.

Replacement Considerations

Direct functional substitutes within the same series include INA310A2IDGKR (50 V/V), INA310A3IDGKR (100 V/V), INA310A4IDGKR (200 V/V), and INA310A5IDGKR (500 V/V). Selection depends on whether the system requires a different output scaling factor. The INA310B variants are available if relaxed precision specifications are acceptable.