INA310B1IDGKR

Overview

The INA310B1IDGKR is a high-precision 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. The device provides a fixed gain of 20 V/V with a signal bandwidth of 1.3 MHz and a slew rate of 2.5 V/µs. Key electrical specifications include a maximum offset voltage of ±500 µV, an input bias current of 30 µA, and a typical CMRR of 140 dB. It incorporates an integrated open-drain comparator with a 0.6 V internal reference threshold.

Feature Summary

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

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and temperature rating. Confirm that the selected variant matches the required gain and accuracy class for the intended application environment.

Selection Notes

Select this component when high-side or low-side sensing is required over a wide common-mode range exceeding standard supply voltages. The fixed 20 V/V gain and 1.3 MHz bandwidth make it suitable for applications demanding rapid fault detection and precise current monitoring in industrial or automotive contexts.

Part Context

This device belongs to the INA310x family of ultra-precise current sense amplifiers. The 'B' designation indicates a specific accuracy grade with higher offset voltage limits compared to the 'A' version. The '1' suffix denotes the fixed gain setting of 20 V/V within this product line.

Replacement Considerations

Consult the official datasheet for recommended alternatives. Ensure any substitute maintains the same gain configuration, package dimensions, and electrical characteristics such as common-mode voltage range and bandwidth.

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 INA310B1IDGKR can withstand survival voltages ranging from -20 V to +120 V on the analog inputs relative to ground.