INA381A4QDGSRQ1

Current Regulation/Management Overview

The INA381A4QDGSRQ1 is an automotive-grade, bidirectional current sense amplifier from Texas Instruments. It operates with a supply voltage range of 2.7 V to 5.5 V and supports common-mode voltages up to 26 V. The device features a fixed gain of 200 V/V and a bandwidth of 350 kHz. Key electrical specifications include a maximum input offset voltage of 100 µV, a typical CMRR of 100 dB, and a quiescent current of 350 µA. It is housed in a VSSOP-10 package and qualified to AEC-Q100 standards for operation between -40°C and +125°C.

Current Regulation/Management Feature Summary

• Bidirectional sensing capability for accurate measurement of current flow in both directions.
• Integrated overcurrent comparator provides immediate fault detection without external components.
• Zero-drift architecture ensures high precision by minimizing offset voltage drift over temperature.
• Automotive qualification ensures reliability and compliance with strict industry standards.

Current Regulation/Management Applications

• Electric vehicle battery management systems
• Motor control and drive circuits
• Industrial power supply monitoring

Current Regulation/Management Procurement Notes

Verify the specific suffix 'QDGSRQ1' matches your design requirements, as it denotes the automotive grade, VSSOP-10 package, and tape-and-reel packaging configuration. Confirm that the 26 V common-mode voltage limit aligns with your system's bus voltage. Ensure the fixed 200 V/V gain is suitable for your signal conditioning needs before finalizing the order.

Current Regulation/Management Selection Notes

Select this component when bidirectional current monitoring is required in automotive environments. The integrated comparator simplifies circuit design by removing the need for external logic. Consider the 350 kHz bandwidth for applications requiring fast response times. The low quiescent current makes it efficient for battery-powered or energy-sensitive systems compared to higher-power alternatives.

Current Regulation/Management Part Context

This part belongs to the INA381 family of current sense amplifiers, which are designed for high-precision monitoring in demanding environments. The 'Q1' suffix indicates AEC-Q100 automotive qualification, while 'A4' specifies the gain setting. The series is widely used in electric vehicles and industrial automation where robust performance and compact packaging are essential.

Current Regulation/Management Replacement Considerations

Check for other variants within the INA381 family, such as different gain settings (e.g., INA381A1, INA381A3), which may offer alternative amplification factors. Verify pin compatibility if substituting with non-TI equivalents, as interface definitions may vary across manufacturers.

Current Regulation/Management FAQ

Is the INA381A4QDGSRQ1 unidirectional or bidirectional?

It is a bidirectional current sense amplifier, capable of measuring positive and negative currents relative to the shunt resistor.

What is the function of the integrated comparator?

The integrated comparator allows for direct connection to a microcontroller or logic gate to trigger alarms or shutdowns when the sensed current exceeds a programmable threshold.

Does this device require external calibration?

No, the zero-drift architecture minimizes offset voltage drift, reducing or eliminating the need for external calibration in most applications.