INA310A3QDGKRQ1

Overview

The INA310A3QDGKRQ1 is an AEC-Q100 qualified, ultra-precise current sense amplifier designed for automotive applications. It features a wide common-mode voltage range from –4 V to +110 V and operates on a single supply of 2.7 V to 20 V. This specific variant offers a fixed gain of 100 V/V with a maximum gain error of 0.15% and offset voltage of ±20 µV. It includes an integrated open-drain comparator with a 0.6 V internal reference and latching capability. The device supports high-speed measurements up to 1.3 MHz bandwidth.

Feature Summary

• Ultra-precise zero-drift architecture ensures high accuracy across wide temperature ranges
• Wide common-mode input range independent of supply voltage enables flexible high-side or low-side sensing
• Integrated open-drain comparator with internal reference simplifies overcurrent protection design
• Functional safety capable with documentation supporting system-level safety integration

Applications

• Electric turbocharger and charger systems
• Electric power steering (EPS) controllers
• Starter/generator units in hybrid vehicles
• Regenerative braking systems
• Automotive brake system monitoring

Procurement Notes

Verify the complete ordering part number against the manufacturer's official database to ensure correct suffixes for temperature grade and package type. Confirm that the selected component meets the specific functional safety requirements of your application design. Check for any recent documentation updates regarding availability or recommended operating conditions before finalizing procurement plans.

Selection Notes

Select this device when precise current measurement is required in high-voltage automotive environments. The 100 V/V gain suits applications requiring moderate signal amplification. Ensure the system can accommodate the 2.7 V to 20 V supply range. Consider the integrated comparator if external fault detection logic is desired to reduce component count and board space.

Part Context

This component belongs to the INA310x-Q1 family of current sense amplifiers from Texas Instruments. It is specifically engineered for automotive electronics requiring AEC-Q100 qualification. The 'A' designation indicates higher precision specifications compared to the 'B' version. The '3' suffix denotes the 100 V/V gain option within the product line.

Replacement Considerations

Official substitutes include other variants within the INA310x-Q1 family such as INA310A1QDGKRQ1, INA310A2QDGKRQ1, INA310A4QDGKRQ1, and INA310A5QDGKRQ1, which share identical pinouts and functionality but offer different fixed gains. Ensure the replacement gain matches the system's signal conditioning requirements.

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 after a trip event until the RESET pin is pulled low or opened again.

What is the maximum common-mode voltage the device can survive?

The device has a survival voltage rating of –20 V to +120 V, while its operational common-mode voltage range is specified from –4 V to +110 V.

Can the gain be adjusted externally?

No, the closed-loop gain is set by an internal precision resistor network. Adding external resistance is not recommended due to potential variations in absolute resistor values affecting accuracy.