Texas Instruments INA241A1QDDFRQ1

Overview

INA241A1QDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to 125°C) ultra-precise bidirectional current sense amplifier with 10V/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 INA241A1QDDFRQ1 datasheet, INA241A1QDDFRQ1 pinout, INA241A1QDDFRQ1 application, or INA241A1QDDFRQ1 equivalent, this page delivers verified specifications, SOT23-8 package details, functional safety documentation support, PWM rejection up to 125kHz, and automotive-grade thermal performance data required for ISO 26262-compliant design validation.

Technical Context

The INA241A1QDDFRQ1 implements a zero-drift, high-common-mode topology with integrated enhanced PWM rejection circuitry that holds output for 1µs during fast ΔV/Δt transients and attenuates residual disturbances via 104dB AC-CMRR at 100kHz. Its input stage operates independently of supply voltage, enabling true high-side sensing at VCM = 110V while powered from only 2.7V–20V.

It supports bidirectional current measurement using dual reference inputs (REF1/REF2) to set output baseline, achieves 8V/µs slew rate and 1% settling in 1µs, and maintains ±0.01% gain error with ±1ppm/°C drift across temperature - critical for closed-loop torque control accuracy in eTurbo and starter/generator inverters.

Key Specifications

Pinout & Package

INA241A1QDDFRQ1 is packaged in an 8-pin SOT23-8 (DDF) footprint measuring 2.9mm × 2.8mm, optimized for space-constrained automotive PCBs and thermally efficient high-power motor drive layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDDFRQ1 and MAX40056ATA+T, the INA241A1QDDFRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 166dB DC-CMRR, and hardware-enhanced PWM rejection - making it the only option qualified for real-time torque control in electric power steering and eTurbo systems.

Availability

INA241A1QDDFRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo control, starter/generator, and regenerative braking systems requiring stable component supply across automotive production lifecycles.

Supply support for INA241A1QDDFRQ1 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 delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The INA241x-Q1 product line was engineered specifically for high-reliability, high-precision current sensing in automotive powertrain and chassis systems - emphasizing AEC-Q100 compliance, functional safety readiness, and robustness against PWM-induced common-mode noise.

FAQ

What is the maximum common-mode voltage the INA241A1QDDFRQ1 can measure?

The INA241A1QDDFRQ1 supports an operational common-mode input range of −5V to 110V and survives up to −20V to 120V. This allows direct high-side sensing on 48V and 800V battery rails without external level-shifting circuitry. The device maintains specified accuracy across its full −40°C to 125°C operating range, making it suitable for under-hood automotive applications where voltage transients and thermal stress are present. The INA241A1QDDFRQ1's ability to operate beyond its supply voltage (2.7V–20V) is enabled by its proprietary high-voltage input stage topology.

Does the INA241A1QDDFRQ1 support bidirectional current sensing?

Yes, the INA241A1QDDFRQ1 supports true bidirectional current sensing using its dual reference inputs (REF1 and REF2). By setting REF1 and REF2 to appropriate voltages - such as VS/2 for centered output or GND/VS for unidirectional offset - the output voltage reflects both positive and negative current flow through the shunt resistor. This capability is essential for applications like regenerative braking and starter/generator systems where energy flows in both directions. The device maintains ±10µV offset and ±0.01% gain error across the full bidirectional range, ensuring high accuracy in both charge and discharge phases.

What is the purpose of the NC pin on the INA241A1QDDFRQ1 SOT23-8 package?

The NC (No Connect) pin on the INA241A1QDDFRQ1 DDF package must be connected to ground, as explicitly required in the datasheet. Although labeled "NC", this pin is internally reserved and grounding it ensures proper device stability, EMI performance, and functional safety compliance. Leaving it floating may cause increased susceptibility to noise, output instability, or failure to meet AEC-Q100 electromagnetic compatibility requirements. This grounding requirement applies uniformly across all SOT23-8, VSSOP-8, SOIC-8, and VSSOP-10 variants of the INA241x-Q1 family.

How does the enhanced PWM rejection feature work in the INA241A1QDDFRQ1?

The INA241A1QDDFRQ1 implements a two-stage enhanced PWM rejection architecture: first, it holds the output constant for 1µs during large common-mode ΔV/Δt transients (e.g., SiC MOSFET switching edges); second, it relies on high AC-CMRR (104dB at 100kHz) and 1.1MHz bandwidth to attenuate residual disturbances occurring after the hold period. This design suppresses output disturbance from PWM frequencies up to 125kHz and is validated for edge separation ≥3µs. Unlike software-based filtering, this hardware-level rejection preserves signal integrity without latency - critical for real-time overcurrent protection in EPS and eTurbo inverters.

Is the INA241A1QDDFRQ1 qualified for functional safety applications?

Yes, the INA241A1QDDFRQ1 is functional safety-capable with documentation available to support ISO 26262 ASIL-B and ASIL-C system development. It features AEC-Q100 Grade 1 qualification (−40°C to 125°C), robust parametric stability over temperature and lifetime, and failure-in-time (FIT) rate data provided by Texas Instruments. While the device itself is not ASIL-certified, its design - including low drift, high CMRR, and predictable fault behavior - enables integration into safety-critical automotive subsystems such as electric power steering and brake-by-wire when used with appropriate system-level diagnostics and redundancy. Functional safety documentation is accessible via TI's product folder for INA241A-Q1.