INA240A3QDRQ1

Overview

The INA240A3QDRQ1 is a zero-drift, bidirectional high-side current sense amplifier from Texas Instruments, designed for automotive applications under AEC-Q100 standards. It features a fixed gain of 100 V/V and operates with a supply voltage range of 2.7 V to 5.5 V. The device supports a wide common-mode voltage range from -4 V to 80 V, enabling accurate sensing even below ground potential. Key electrical specifications include a maximum input offset voltage of 5 µV, a gain error of 0.05%, and a 3dB bandwidth of 400 kHz. It is housed in an 8-SOIC package.

Feature Summary

• Zero-drift architecture ensures high precision by minimizing offset voltage drift over temperature variations.
• Enhanced PWM suppression capability provides robust rejection of high common-mode transients during switching events.
• Bidirectional operation allows for accurate current measurement in both directions within the specified common-mode range.

Applications

• Automotive solenoid control circuits requiring precise current monitoring
• High-side current sensing in systems with significant voltage transients
• Battery management systems in electric vehicles

Procurement Notes

Verify the specific suffix QDRQ1 confirms AEC-Q100 qualification and SOIC-8 packaging. Ensure compatibility with your system's common-mode voltage limits, which extend to 80 V. Confirm that the fixed 100 V/V gain aligns with your ADC input requirements. Check moisture sensitivity levels and reflow soldering profiles appropriate for automotive-grade components.

Selection Notes

Select this component when high accuracy is required in noisy automotive environments. The zero-drift technology eliminates the need for external calibration in many applications. Consider the 400 kHz bandwidth for response speed requirements. The bidirectional feature is essential if reverse current flow must be detected. Compare against standard amplifiers where offset drift would compromise long-term stability.

Part Context

This part belongs to the INA240 family of current sense amplifiers, specifically tailored for automotive use. The 'Q' indicates AEC-Q100 qualification, while 'D' denotes the SOIC-8 package and 'RQ1' specifies tape-and-reel packaging. It shares architectural similarities with other INA240 variants but offers specific pinout and packaging options for different board layout constraints.

Replacement Considerations

Direct substitutes include other AEC-Q100 qualified current sense amplifiers with similar gain and common-mode ranges. Verify pin compatibility and thermal performance before substitution. Alternative parts may require adjustments to external filtering or gain settings if their specifications differ significantly.