INA310A4QDGKRQ1

Overview

The INA310A4QDGKRQ1 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 device offers a fixed gain of 200 V/V with a maximum gain error of 0.15% and offset voltage of ±5 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 ranging from –40°C to +125°C
• Ultra-precise measurement with low offset voltage and high CMRR
• Integrated open-drain comparator with programmable threshold via external divider
• Wide common-mode input range independent of supply voltage

Applications

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

Procurement Notes

Verify the specific ordering suffix matches the required package and temperature grade. Confirm functional safety documentation availability if the design requires ISO 26262 compliance. Ensure the selected gain version aligns with the target signal-to-noise ratio and dynamic range requirements for the specific application.

Selection Notes

Select this part for high-voltage automotive sensing where precision and speed are critical. The 200 V/V gain suits applications requiring high resolution for small shunt voltages. Consider the integrated comparator for fast overcurrent protection without external logic. Verify that the 1.3 MHz bandwidth meets the transient response needs of the system.

Part Context

This component belongs to the INA310x-Q1 family of current sense amplifiers. It shares architectural similarities with other members like the INA310A3QDGKRQ1 but differs in fixed gain settings. The family is characterized by zero-drift topology and high common-mode rejection, making it suitable for demanding industrial and automotive environments.

Replacement Considerations

Direct replacements within the same family include INA310B4QDGKRQ1, which offers slightly lower precision specifications. Other gain variants such as INA310A3QDGKRQ1 or INA310A5QDGKRQ1 may be used if gain adjustments are permissible in the circuit design.

FAQ

How does the RESET pin affect the comparator operation?

When the RESET pin is grounded or left open, the comparator operates in transparent mode. When pulled high, it enters latching mode, holding the output high until the reset condition is cleared.

What is the maximum survival voltage for the inputs?

The INA310A4QDGKRQ1 can survive input voltages ranging from –20 V to +120 V with respect to ground, although the operational range is limited to –4 V to +110 V.