INA241A2QDDFRQ1

Overview

The INA241A2QDDFRQ1 is an ultra-precise, bidirectional current sense amplifier from Texas Instruments. It measures voltage drops across shunt resistors over a wide common-mode range of -5V to 110V, independent of the supply voltage. The device features a fixed gain of 20V/V and operates on a supply voltage between 2.7V and 20V. Key electrical specifications include a maximum offset voltage of ±15µV, a maximum gain error of ±0.01%, and a typical DC CMRR of 166dB. It supports switching frequencies up to 125kHz with enhanced PWM rejection.

Feature Summary

• Enhanced PWM rejection circuitry minimizes signal disturbance at the output caused by large common-mode voltage transients at the inputs.
• Ultra-precision architecture ensures high accuracy through low offset voltage and minimal gain error across the operating temperature range.
• Bidirectional operation allows for accurate measurement of both positive and negative currents in high-side, low-side, or inline configurations.

Applications

• Electric power steering (EPS)
• eTurbo/charger systems
• Starter/generator applications
• Regenerative braking systems

Procurement Notes

Verify the specific suffix QDDFRQ1 corresponds to the AEC-Q100 Grade 1 qualification and SOT-23-8 package configuration. Confirm that the functional safety documentation requirements align with your system design needs. Ensure the supply voltage and common-mode input ranges match the target application's electrical constraints before finalizing procurement.

Selection Notes

Select this component when high precision is required in environments with significant common-mode noise or switching transients. The 20V/V gain is suitable for applications requiring moderate amplification of small shunt voltages. Consider the thermal performance in the DDF package if operating near the upper limits of the temperature range or under high load conditions.

Part Context

This part belongs to the INA241x-Q1 family of automotive-grade current sense amplifiers. The 'A' designation indicates the ultra-precise version with tighter tolerance specifications compared to the standard 'B' grade. The 'Q1' suffix denotes AEC-Q100 qualification for automotive use, ensuring reliability under harsh environmental conditions.

Replacement Considerations

INA241A2QDGKRQ1: Same electrical specifications but in VSSOP-8 package. INA241A2QDRQ1: Same electrical specifications but in SOIC-8 package. Verify pin compatibility and thermal characteristics when substituting packages within the same gain and grade family.