INA310B4QDGKRQ1

Overview

The INA310B4QDGKRQ1 is an AEC-Q100 qualified, ultra-precise current sense amplifier featuring a fixed gain of 200 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. Key electrical characteristics include a maximum offset voltage of ±200 µV, a typical CMRR of 140 dB, and a quiescent current of 1.6 mA. The device integrates an open-drain comparator with a 0.6 V internal reference and latching capability, housed in an 8-pin VSSOP package.

Feature Summary

• Ultra-precise zero-drift architecture 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 independent of supply voltage
• High signal bandwidth designed for fast overcurrent protection applications

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 B-grade accuracy class and 200 V/V gain configuration against design requirements. Confirm automotive qualification status and functional safety documentation availability for integration into safety-critical systems. Ensure thermal management aligns with the specified junction-to-ambient resistance values for the VSSOP-8 package.

Selection Notes

Select this variant when a fixed 200 V/V gain is required for high-resolution sensing of small differential voltages. The B-grade version offers higher offset voltage limits compared to the A-grade but maintains robust CMRR. Consider the integrated comparator for simplified overcurrent detection without external components. Evaluate the 1.6 mA quiescent current against system power budgets.

Part Context

This component belongs to the INA310x-Q1 family of ultra-precise current sense amplifiers designed for automotive environments. The family provides multiple gain options ranging from 20 V/V to 500 V/V. The 'B' suffix denotes the B-grade accuracy tier, while 'Q1' indicates AEC-Q100 automotive qualification. The 'DGKR' suffix specifies the VSSOP-8 tape and reel packaging format.

Replacement Considerations

INA310A4QDGKRQ1

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 after a trip event until the pin is reset.

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

While the operational range is up to 110 V, the device can survive transient voltages up to +120 V and down to -20 V on the analog inputs relative to ground.

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.