Texas Instruments INA241A3QDDFRQ1

Overview

INA241A3QDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to 125°C) ultra-precise bidirectional current sense amplifier with 50V/V gain, −5V to 110V common-mode input range, ±10µV max offset voltage, and enhanced PWM rejection up to 125kHz - deployed in high-voltage motor control loops for electric power steering and regenerative braking systems.

For engineers reviewing the INA241A3QDDFRQ1 datasheet, INA241A3QDDFRQ1 pinout, INA241A3QDDFRQ1 application, or INA241A3QDDFRQ1 equivalent, this page delivers verified specifications, SOT-23-8 pin mapping, automotive-grade thermal and accuracy data, and direct alternatives for high-side/low-side shunt monitoring in switching powertrain systems.

Technical Context

The INA241A3QDDFRQ1 employs a zero-drift, high-CMRR topology with dedicated PWM rejection circuitry that holds output for 1 µs during fast common-mode transients (ΔV/Δt), then relies on 1.1MHz bandwidth and 104dB AC-CMRR at 100kHz to suppress residual disturbances. Its input stage operates independently of supply voltage, enabling valid sensing even when V_CM exceeds V_S (e.g., −5V to 110V at V_S = 5V).

It supports bidirectional current measurement via differential input (IN+, IN−), dual reference inputs (REF1, REF2) for output level shifting, and features 8V/µs slew rate with 1% settling in 1 µs - optimized for real-time overcurrent detection in 48V–800V automotive inverters and eTurbo drivers.

Key Specifications

Pinout & Package

INA241A3QDDFRQ1 is packaged in DDF (SOT-23-8) - 2.9mm × 2.8mm, 0.95mm height, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3QDDFRQ1 and MAX40056ATA+T, the INA241A3QDDFRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 125kHz PWM rejection, and ±10µV offset in SOT-23-8 - making it the only option qualified for ASIL-B EPS and brake-by-wire current monitoring without layout or firmware compensation.

Availability

INA241A3QDDFRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), regenerative braking, and eTurbo control systems requiring stable component supply, long-term automotive lifecycle support, and traceable AEC-Q100 production lots.

Supply support for INA241A3QDDFRQ1 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, embedded processing, and automotive ICs, with decades of experience delivering AEC-Q100-qualified signal chain solutions.

The INA241x-Q1 product line was designed specifically for high-accuracy, high-CMRR current sensing in automotive powertrain and chassis systems - addressing the precision, noise immunity, and reliability demands of next-generation 48V and 800V electric vehicles.

FAQ

What is the maximum common-mode voltage the INA241A3QDDFRQ1 can withstand during normal operation?

The INA241A3QDDFRQ1 operates over a common-mode input range of −5V to 110V. This means it maintains specified accuracy and functionality when the voltage at both IN+ and IN− pins lies anywhere within that span - including cases where V_CM exceeds the supply voltage (e.g., 110V V_CM at V_S = 5V). The device also survives −20V to 120V per absolute maximum ratings, but those are stress limits, not operating conditions.

Does the INA241A3QDDFRQ1 require external passive components for stable operation?

The INA241A3QDDFRQ1 requires only a 1µF ceramic bypass capacitor between V_S and GND, placed as close as possible to Pins 6 and 2. No external gain-setting resistors, filters, or compensation networks are needed - its 50V/V gain, 1.1MHz bandwidth, and enhanced PWM rejection are fully integrated. REF1 and REF2 may be tied to defined voltages (e.g., V_S/2) using low-impedance sources, but no series resistors are required.

How does the enhanced PWM rejection feature of the INA241A3QDDFRQ1 improve system-level accuracy?

The INA241A3QDDFRQ1's enhanced PWM rejection holds its output steady for 1 µs during fast common-mode transients (e.g., MOSFET switching edges), then uses its 1.1MHz bandwidth and 104dB AC-CMRR at 100kHz to attenuate residual disturbances. This prevents erroneous current readings during PWM dead-time and commutation events - eliminating the need for post-processing digital filtering or hardware RC snubbers that degrade response time and add board space.

Can the INA241A3QDDFRQ1 be used in bidirectional motor control applications?

Yes - the INA241A3QDDFRQ1 is explicitly designed for bidirectional current sensing. Its input stage accepts both positive and negative differential voltages across the shunt resistor, and its output swings symmetrically around the (REF1 + REF2)/2 reference point. In motor H-bridge applications, it accurately measures forward and reverse current with identical gain and offset performance - confirmed by AEC-Q100 testing across −40°C to 125°C.

What is the thermal performance of the INA241A3QDDFRQ1 in its SOT-23-8 (DDF) package?

In the DDF (SOT-23-8) package, the INA241A3QDDFRQ1 has a junction-to-ambient thermal resistance (R_θJA) of 129.7°C/W. At 2.5mA quiescent current and 5V supply, power dissipation is ~12.5mW - resulting in <1.6°C junction-to-ambient rise under still-air conditions. With proper PCB copper pour (≥1in² 2oz copper), thermal rise remains well below 1°C, ensuring stable offset and gain performance in compact EPS modules.