INA310A5IDGKR

Overview

The INA310A5IDGKR is an ultra-precise current sense amplifier from Texas Instruments, featuring a fixed gain of 500 V/V. It operates with a wide common-mode voltage range from -4 V to +110 V and supports supply voltages between 2.7 V and 20 V. Key electrical specifications include a maximum offset voltage of ±20 µV, a typical CMRR of 160 dB, and a signal bandwidth of 1.3 MHz. The device draws 1.6 mA of quiescent current and includes an integrated open-drain comparator with a 0.6 V reference threshold.

Feature Summary

• Ultra-precise zero-drift architecture ensures high accuracy with low offset voltage and minimal drift over temperature.
• Wide common-mode input range allows operation from -4 V to +110 V, independent of the supply voltage.
• Integrated open-drain comparator provides fast overcurrent protection with latching capability and a 0.6 V internal reference.
• High signal bandwidth of 1.3 MHz enables rapid detection and processing of transient current events.

Applications

• 48 V DC/DC converter current monitoring
• 48 V battery management systems (BMS)
• Macro remote radio unit (RRU) power sensing
• 48 V rack server power distribution
• Solenoids and actuators control

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and tape-and-reel specifications. Confirm that the selected variant matches the required gain and accuracy grade for the intended application environment.

Selection Notes

Select this component when high-speed response and precision are critical in high-voltage environments. The 500 V/V gain is suitable for detecting very small shunt voltage drops. Ensure the system design accommodates the 1.6 mA supply current and utilizes the integrated comparator for efficient fault handling without external logic.

Part Context

This device belongs to the INA310x family of current sense amplifiers designed for high-side and low-side sensing. It distinguishes itself through its zero-drift technology and integrated comparator, offering a compact solution for applications requiring both precise measurement and fast fault protection in a single package.

Replacement Considerations

Direct replacements within the same family include other INA310A variants with different fixed gains, such as INA310A1 (20 V/V), INA310A2 (50 V/V), INA310A3 (100 V/V), or INA310A4 (200 V/V). These share identical pinouts and features but differ in amplification factor.

FAQ

How does the RESET pin affect the comparator operation?

When the RESET pin is left open or connected to GND, the comparator operates in transparent mode. When pulled high, it enters latching mode, holding the output high until the reset condition is cleared.

What is the maximum survival voltage for the inputs?

The INA310A5IDGKR can withstand survival voltages ranging from -20 V to +120 V on the analog inputs, even though the operational range is -4 V to +110 V.