Texas Instruments INA241A2QDDFRQ1

Overview

INA241A2QDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to 125°C) ultra-precise bidirectional current sense amplifier with 20V/V gain, −5V to 110V common-mode input range, ±10µV max offset voltage, and 1.1MHz bandwidth-designed for high-voltage motor control in electric power steering and regenerative braking systems.

For engineers reviewing the INA241A2QDDFRQ1 datasheet, INA241A2QDDFRQ1 pinout, INA241A2QDDFRQ1 application, or INA241A2QDDFRQ1 equivalent, this page delivers verified specifications, automotive-grade thermal and PWM rejection performance, package-specific pin functions, and real-world use cases in high-dV/dt switching environments.

Technical Context

The INA241A2QDDFRQ1 employs a zero-drift, high-CMRR topology with integrated enhanced PWM rejection circuitry that suppresses output disturbance during fast common-mode transients up to 125kHz. Its input stage operates independently of supply voltage, enabling operation with V_CM exceeding V_S (e.g., 110V at V_S = 5V).

It features dual reference inputs (REF1/REF2) for flexible output level shifting, supports bidirectional sensing via differential input polarity, and maintains 1.1MHz small-signal bandwidth and 8V/µs slew rate across all gains-including its fixed 20V/V configuration-enabling sub-microsecond step response (1µs to 1%) in overcurrent detection.

Key Specifications

Pinout & Package

INA241A2QDDFRQ1 is packaged in an 8-pin SOT-23 (DDF) measuring 2.9mm × 2.8mm, optimized for space-constrained automotive PCBs with thermal resistance R_θJA = 129.7°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sense amplifier applications.

Compared with INA241A2QDDFRQ1, INA240A2QDDFRQ1 trades 10µV offset and 4dB AC CMRR for lower cost, while MAX40056ATA+T lacks PWM rejection and half the common-mode range-making neither suitable as drop-in replacements in high-dV/dt automotive motor control.

Availability

INA241A2QDDFRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), regenerative braking, eTurbo control, and starter-generator systems requiring stable component supply across automotive production lifecycles.

Supply support for INA241A2QDDFRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade signal conditioning and power management ICs.

The INA241x-Q1 product line was engineered specifically for high-accuracy, high-dV/dt current sensing in next-generation electric vehicle powertrains-including EPS, traction inverters, and 48V systems-where precision, reliability, and PWM immunity are non-negotiable.

FAQ

What is the maximum common-mode voltage the INA241A2QDDFRQ1 can withstand during operation?

The INA241A2QDDFRQ1 operates continuously over a common-mode input range of −5V to 110V. Its survival rating extends to −20V to 120V, meaning it tolerates transient overvoltage events beyond normal operation without damage. This allows direct placement on high-voltage battery rails or inverter outputs without external protection circuitry-critical for compact EPS and eTurbo designs where board space is constrained.

Does the INA241A2QDDFRQ1 support bidirectional current sensing, and how is polarity determined?

Yes, the INA241A2QDDFRQ1 supports true bidirectional current sensing. Polarity is determined by the relative voltage at IN+ and IN−: when IN+ > IN−, output rises above the reference level (e.g., V_S/2); when IN+ < IN−, output falls below it. This enables seamless detection of motoring and regenerative current in starter-generator and brake systems using a single shunt resistor and device-eliminating the need for dual amplifiers or complex switching networks.

How does the enhanced PWM rejection feature of the INA241A2QDDFRQ1 improve system reliability?

The enhanced PWM rejection in the INA241A2QDDFRQ1 actively suppresses output disturbance caused by fast common-mode transients (up to 125kHz). It holds the output stable for 1µs after each edge and leverages high AC CMRR (104dB @ 100kHz) to attenuate residual noise-preventing false overcurrent faults during motor commutation. This directly improves functional safety compliance in ASIL-B systems like EPS, reducing diagnostic burden and eliminating unnecessary shutdowns.

What is the typical quiescent current draw of the INA241A2QDDFRQ1, and how does it vary with supply voltage?

The INA241A2QDDFRQ1 draws 2.5mA typical quiescent current at 25°C, rising to 3.2mA at −40°C to +125°C extremes. It remains stable across its full 2.7V–20V supply range-with variation less than ±0.1mA from 5V to 12V-making it ideal for always-on automotive domains where standby power budget is tightly constrained. No external biasing or enable control is needed to achieve this low, predictable consumption.

Can the INA241A2QDDFRQ1 be used with a single-ended reference, and what are the implications for output swing?

Yes, the INA241A2QDDFRQ1 supports single-ended referencing: tie REF1 to V_S and REF2 to GND to configure the output for unidirectional sensing with 0V to V_S swing. In this mode, the device delivers full-scale output for positive current only, simplifying ADC interface design in applications like battery charging where reverse current is irrelevant. Output swing remains rail-to-rail (within 70mV of V_S and 20mV of GND) across temperature and load conditions.