INA310B3IDGKR

Overview

The INA310B3IDGKR is an ultra-precise current sense amplifier from Texas Instruments, featuring a fixed gain of 100 V/V. It operates with a common-mode voltage range of -4 V to 110 V and supports supply voltages from 2.7 V to 20 V. Key electrical characteristics include a maximum offset voltage of ±250 µV, a typical CMRR of 140 dB, and a signal bandwidth of 1.3 MHz. The device incorporates an open-drain comparator with a 0.6 V internal reference and latching capability.

Feature Summary

• Ultra-precise zero-drift architecture for high accuracy
• Wide common-mode voltage range independent of supply
• Integrated open-drain comparator with latching function
• High-speed response suitable for fast overcurrent protection

Applications

• 48 V DC/DC converters
• Battery management systems (BMS)
• Macro remote radio units (RRU)
• Rack server power supplies
• Solenoids and actuators

Procurement Notes

Verify the specific suffix IDGKR corresponds to the VSSOP-8 package and tape-and-reel shipping configuration. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process. Ensure the operating temperature range meets your environmental specifications.

Selection Notes

Select this part when a fixed 100 V/V gain is required for high-side or low-side sensing. The B version offers 0.5% gain error and 250 µV offset, suitable for general precision applications. Consider the A version if tighter tolerances are needed. Ensure the shunt resistor value allows for sufficient VSENSE given the output swing limits.

Part Context

This component belongs to the INA310x family of high-voltage current sense amplifiers. It shares the same core architecture and pinout with other variants like INA310A3IDGKR but differs in precision grades. The family is designed for robust performance in harsh electrical environments with wide common-mode ranges.

Replacement Considerations

Direct replacements within the same series include INA310A3IDGKR for higher precision or other gain variants like INA310B2IDGKR if different amplification is acceptable. Verify that any substitute maintains the 100 V/V gain and compatible package dimensions.

FAQ

How does the RESET pin affect the comparator operation?

Grounding or leaving the RESET pin open enables transparent mode where the output responds normally. Connecting it to the supply voltage activates latching mode, holding the output high until reset.

What is the maximum survival voltage for the inputs?

The INA310B3IDGKR can survive input voltages ranging from -20 V to +120 V relative to ground, although operational range is limited to -4 V to 110 V.