INA241B3QDDFRQ1

Overview

The INA241B3QDDFRQ1 is an AEC-Q100 qualified, bidirectional current-sense amplifier with a gain of 50 V/V. It operates over a common-mode voltage range of –5V to 110V and supports supply voltages from 2.7V to 20V. The device features enhanced PWM rejection for switching systems up to 125kHz, a small-signal bandwidth of 1.1MHz, and a slew rate of 8V/µs. It provides a maximum DC CMRR of 120dB and a typical offset voltage of 150µV. The component is housed in an SOT-23-8 (DDF) package.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output disturbances caused by high-speed common-mode transients.
• Bidirectional operation enables accurate measurement across a wide common-mode voltage range independent of the supply voltage.
• High small-signal bandwidth ensures rapid detection and processing of over-current events.

Applications

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

Procurement Notes

Verify that the specific suffix QDDFRQ1 corresponds to the automotive-grade B version in the DDF package. Confirm the operating temperature grade matches system requirements, as Grade 1 specifies -40°C to 125°C while other variants may support higher temperatures. Ensure functional safety documentation is requested if the design requires ISO 26262 compliance support.

Selection Notes

Select this part when a fixed gain of 50 V/V is required for bidirectional sensing. The B version offers a balance of precision and cost compared to the A version. Verify that the application's shunt resistor values align with the available output dynamic range at the chosen gain. Consider the thermal resistance of the SOT-23-8 package for heat dissipation in dense layouts.

Part Context

This component belongs to the INA241x-Q1 family of ultra-precise current sense amplifiers designed for automotive environments. The family includes multiple gain options and package types, all sharing the same core architecture for high common-mode rejection and PWM resilience. The 'B' designation indicates specific accuracy and drift characteristics distinct from the 'A' grade within the series.

Replacement Considerations

INA241B3QDRQ1 (SOIC-8 package variant).

FAQ

How does the device handle large common-mode voltage transitions?

The INA241B3QDDFRQ1 utilizes enhanced PWM rejection circuitry that holds the output for 1µs during large common-mode transients, preventing signal propagation errors.

What is the maximum common-mode voltage supported?

The device supports an operational common-mode voltage range from –5V to 110V.