INA310B5IDGKR

Overview

The INA310B5IDGKR is an ultra-precise current sense amplifier manufactured by Texas Instruments. It features a wide common-mode voltage range from -4 V to +110 V and operates on a single supply voltage between 2.7 V and 20 V. This specific variant offers a fixed gain of 500 V/V, enabling high-resolution measurement of small voltage drops across shunt resistors. The device integrates an open-drain comparator with a 0.6 V internal reference and latching capability. It provides a signal bandwidth of 1.3 MHz and maintains low offset voltage characteristics suitable for demanding industrial applications.

Feature Summary

• Ultra-precise zero-drift architecture ensures high accuracy over temperature
• Integrated open-drain comparator with programmable threshold via external divider
• Wide common-mode input range independent of supply voltage
• High-speed response with 1.3 MHz bandwidth for fast overcurrent protection

Applications

• 48 V DC/DC converter current monitoring
• Battery management systems (BMS) in electric vehicles
• Macro remote radio unit (RRU) power sensing
• 48 V rack server and merchant network power supplies
• Solenoid and actuator control circuits

Procurement Notes

Verify the complete part number including suffixes such as DGKR for tape-and-reel packaging when ordering. Confirm that the B5 designation corresponds to the required 500 V/V gain and B-grade accuracy specifications for your design. Ensure compatibility with the VSSOP-8 package dimensions during PCB layout planning.

Selection Notes

Select this component when high-side or low-side sensing is required within a -4 V to 110 V common-mode window. The 500 V/V gain is optimal for detecting very small shunt voltages in high-current applications. Consider the integrated comparator if discrete overcurrent protection logic is desired to reduce bill of materials.

Part Context

This device belongs to the INA310x family of current sense amplifiers from Texas Instruments. The family includes variants with different gain options (20 V/V to 500 V/V) and accuracy grades (A and B). The INA310B5 specifically denotes the B-grade accuracy version with a fixed 500 V/V gain, distinguishing it from other gain configurations in the same series.

Replacement Considerations

Direct replacements within the same family include INA310A5IDGKR for higher precision or INA310B1 through INA310B4 for different gain requirements. Cross-family replacement requires careful evaluation of common-mode voltage limits and gain accuracy specifications.

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 connected to the supply voltage, it enters latching mode, holding the output high until reset.

What is the maximum common-mode survival voltage?

The INA310B5IDGKR can survive common-mode voltages up to +120 V and down to -20 V, although its operational range is specified from -4 V to +110 V.