Texas Instruments INA241A1QDGKRQ1

Overview

INA241A1QDGKRQ1 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 enhanced PWM rejection up to 125kHz - deployed in electric power steering and regenerative braking systems for accurate inline motor current monitoring.

For engineers reviewing the INA241A1QDGKRQ1 datasheet, INA241A1QDGKRQ1 pinout, INA241A1QDGKRQ1 application, or INA241A1QDGKRQ1 equivalent, this page delivers verified specifications, automotive-grade thermal and ESD performance, functional safety documentation support, and real-world implementation context for high-voltage switching systems.

Technical Context

The INA241A1QDGKRQ1 employs a zero-drift, high-CMRR architecture with dual reference inputs (REF1/REF2) enabling output level shifting across its full supply range (2.7V–20V). Its enhanced PWM rejection circuitry suppresses common-mode transients by holding output for 1µs during fast ΔV/Δt edges, then leveraging 1.1MHz bandwidth and 104dB AC-CMRR at 100kHz for residual attenuation.

It operates in high-side, low-side, or inline configurations with bidirectional sensing capability, supported by input bias current of 35µA (typ) independent of common-mode voltage up to 110V. The device's survival rating (−20V to 120V) and AEC-Q100 qualification ensure robustness in automotive 48V and traction battery subsystems.

Key Specifications

Pinout & Package

VSSOP-8 package (DGK), 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDGKRQ1 and MAX40056ATA+T, the INA241A1QDGKRQ1 delivers superior DC accuracy, certified automotive thermal robustness, and unique PWM transient suppression - making it the only choice for ASIL-B compliant EPS and brake-by-wire current monitoring where measurement integrity directly impacts functional safety.

Availability

INA241A1QDGKRQ1 is available at Aetrix Electronics and suitable for electric power steering, regenerative braking, and eTurbo control systems requiring stable component supply, long-term automotive lifecycle support, and traceable AEC-Q100-compliant sourcing.

Supply support for INA241A1QDGKRQ1 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 decades of automotive IC design expertise and broad functional safety certification coverage.

The INA241x-Q1 product line was engineered specifically for high-voltage, high-precision current sensing in next-generation electrified vehicle subsystems - emphasizing PWM noise immunity, wide common-mode operation, and AEC-Q100 reliability under harsh thermal and electrical conditions.

FAQ

What is the maximum common-mode voltage the INA241A1QDGKRQ1 can withstand during transient events?

The INA241A1QDGKRQ1 has a survival rating of −20V to 120V, meaning it withstands short-duration transients such as load dump or inductive kick without damage. Its operational common-mode range remains −5V to 110V under continuous conditions. This 10V margin above nominal 110V operation provides robustness in 48V and 800V traction systems where voltage spikes exceed steady-state values. The INA241A1QDGKRQ1 maintains specified performance within the operational range.

Does the INA241A1QDGKRQ1 require external components for enhanced PWM rejection to function?

No, the enhanced PWM rejection in the INA241A1QDGKRQ1 is implemented entirely within the silicon - no external filters, RC networks, or layout modifications are needed. The internal circuitry automatically detects fast common-mode edges (>125kHz), holds the output for 1µs, then relies on inherent 1.1MHz bandwidth and 104dB AC-CMRR for residual attenuation. This simplifies design and eliminates tuning effort compared to discrete solutions.

How does the dual-reference input (REF1 and REF2) improve system integration in automotive ECUs?

The REF1 and REF2 pins allow precise setting of the output common-mode voltage - for example, centering the 10× amplified signal at 1.65V for direct interface with a 3.3V ADC. This eliminates need for external op-amps or level-shifters, reduces component count, and avoids introducing additional offset or noise. In EPS modules, this enables ratiometric measurement where REF1/REF2 track the ADC reference, canceling supply variations.

Is the INA241A1QDGKRQ1 pin-compatible with other members of the INA241x-Q1 family?

Yes - all INA241x-Q1 variants (A1–A5, B1–B5) share identical pinouts across DDF, DGK, D, and DGS packages. The INA241A1QDGKRQ1 in VSSOP-8 uses the same 8-pin layout as INA241A2QDGKRQ1 or INA241B1QDGKRQ1, enabling hardware reuse across designs with different gain requirements. No PCB redesign is needed when scaling gain for varying shunt values or dynamic range needs.

What functional safety documentation is available for the INA241A1QDGKRQ1?

Texas Instruments provides a dedicated Functional Safety Manual (FSM) for the INA241x-Q1 family, including FIT rate data, failure mode analysis, safety mechanisms description, and diagnostic coverage metrics aligned with ISO 26262 ASIL-B. This documentation supports systematic development of safety-related current sensing functions in EPS, brake, and powertrain ECUs - and is accessible via TI's product folder for INA241A1QDGKRQ1.