INA310B5QDGKRQ1

Overview

The INA310B5QDGKRQ1 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. The device provides a fixed gain of 500 V/V with a maximum gain error of 0.5% and offset voltage of ±150 µV. It includes an integrated open-drain comparator with a 0.6 V internal reference and latching capability. The package is VSSOP-8.

Feature Summary

• AEC-Q100 Grade 1 qualification for temperatures up to 125°C
• Ultra-high common-mode rejection ratio for precision sensing
• Integrated open-drain comparator with latching functionality
• Low input bias current independent of common-mode voltage

Applications

• Electric power steering (EPS) systems
• eTurbo and charger control circuits
• Starter/generator monitoring
• Regenerative braking systems
• Automotive brake system protection

Procurement Notes

Verify the specific suffix QDGKRQ1 corresponds to the VSSOP-8 tape-and-reel packaging configuration. Confirm that the B5 variant meets the required gain accuracy specifications for the target application. Ensure functional safety documentation requirements are addressed if the design involves safety-critical subsystems.

Selection Notes

Select this component when high-side or low-side current sensing is required over a wide common-mode range exceeding standard supply voltages. The 500 V/V gain is suitable for detecting small voltage drops across low-ohmic shunts. Consider the integrated comparator for fast overcurrent protection without external logic components.

Part Context

This part belongs to the INA310x-Q1 family of ultra-precise current sense amplifiers. It shares architectural similarities with the INA310A-Q1 but offers different accuracy grades. The Q1 suffix indicates automotive qualification, while DGKR denotes the specific surface-mount package and reel quantity.

Replacement Considerations

INA310B5IDGKRQ1

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 enables latching mode, holding the output high until reset.

What is the maximum survival voltage for the inputs?

The analog inputs can survive voltages from –20 V to +120 V with respect to ground, although the operational range is limited to –4 V to +110 V.