INA310B3QDGKRQ1

Overview

The INA310B3QDGKRQ1 is an automotive-grade current sense amplifier featuring a fixed gain of 100 V/V. It operates with a common-mode voltage range from –4 V to +110 V and supports supply voltages between 2.7 V and 20 V. The device delivers a signal bandwidth of 1.3 MHz, a slew rate of 2.5 V/µs, and a typical CMRR of 160 dB. It incorporates an open-drain comparator with a 0.6 V internal reference and latching capability. Packaged in a VSSOP-8, it functions within a temperature range of –40°C to +125°C.

Feature Summary

• Ultra-precise zero-drift topology for high accuracy across wide temperature ranges
• Integrated open-drain comparator with internal 0.6 V reference and latching functionality
• Wide common-mode input range extending from negative voltages up to 110 V
• High-speed performance with 1.3 MHz bandwidth and low propagation delay

Applications

• Electric turbocharger and charger systems
• Electric power steering (EPS) controllers
• Starter and generator circuits
• Regenerative braking systems
• Automotive brake system monitoring

Procurement Notes

Verify the specific suffix QDGKRQ1 corresponds to the desired packaging and automotive qualification status. Confirm that the B3 variant matches the required 100 V/V gain specification for the target application circuit design.

Selection Notes

Select this component when high-side or low-side sensing is required above standard supply rails. The 100 V/V gain suits applications needing moderate amplification of small shunt voltages. Ensure the external pull-up resistor for the comparator output aligns with the controller logic levels.

Part Context

This part belongs to the INA310x-Q1 family of ultra-precise current sense amplifiers designed for automotive environments. It shares architectural similarities with other members but differs in fixed gain options ranging from 20 V/V to 500 V/V. The B3 designation specifically indicates the 100 V/V gain version within the B-grade accuracy series.

Replacement Considerations

Direct replacements include other INA310B3 variants such as INA310B3QDRQRQ1 if package differences are acceptable. Verify functional safety documentation availability if replacing in safety-critical designs.

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 device can survive input voltages ranging from –20 V to +120 V, although the operational common-mode range is limited to –4 V to +110 V.