Texas Instruments INA241A5IDDFR

Overview

INA241A5IDDFR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 200V/V fixed gain, −5V to 110V operational common-mode range, ±0.015% max gain error, ±8µV max input offset voltage, and enhanced PWM rejection up to 125kHz - deployed in motor drive inline current monitoring.

For engineers reviewing the INA241A5IDDFR datasheet, INA241A5IDDFR pinout, INA241A5IDDFR application, or INA241A5IDDFR equivalent, this page delivers verified specifications, SOT-23-8 package details, real-world use cases in solenoid control and drone propulsion, and validated alternative part comparisons for precision high-side/low-side sensing designs.

Technical Context

The INA241A5IDDFR uses a zero-drift, multistage amplifier architecture enabling 1.1MHz bandwidth at 200V/V gain while maintaining 8V/µs slew rate and 1µs 1% settling time. Its enhanced PWM rejection circuitry actively suppresses common-mode transients by holding output for 1µs during fast ΔV/Δt edges, then relying on 104dB AC-CMRR at 100kHz for subsequent attenuation.

It operates from 2.7V–20V supply with 2.5mA quiescent current, supports bidirectional sensing via dual reference pins (REF1/REF2), and achieves ±0.1µV/°C offset drift and ±1ppm/°C gain drift over −40°C to +125°C - all while sustaining input bias current of 35µA independent of common-mode voltage up to 110V.

Key Specifications

Pinout & Package

INA241A5IDDFR is housed in an 8-pin SOT-23 (DDF) package measuring 2.9mm × 2.8mm, optimized for space-constrained PCB layouts in portable power tools and drone ESCs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA241A5IDDFR, INA240A5IDR trades PWM robustness and offset precision for lower cost, while MAX40056ATA+T offers higher speed but sacrifices high-voltage operation and DC accuracy - making INA241A5IDDFR optimal for 48V–72V motor systems demanding simultaneous bandwidth, accuracy, and noise immunity.

Availability

INA241A5IDDFR is available at Aetrix Electronics and suitable for motor drives, solenoid controls, drone propulsion systems, and cordless power tools requiring stable component supply across extended temperature ranges and high-reliability production cycles.

Supply support for INA241A5IDDFR 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 expertise in precision signal conditioning and high-voltage interface ICs.

The INA241x family was engineered specifically for next-generation motor control and energy-efficient power conversion, targeting applications where switching noise, wide common-mode voltage, and metrology-grade accuracy must coexist - such as industrial automation and battery-powered mobility systems.

FAQ

What is the maximum common-mode voltage the INA241A5IDDFR can withstand during continuous operation?

The INA241A5IDDFR supports a continuous operational common-mode voltage range of −5V to 110V. This allows direct high-side sensing on 48V, 60V, and even 72V bus systems without external level-shifting circuitry. Its survival rating extends to −20V to 120V, providing margin against transient overvoltage events. The device maintains specified performance across this full range, independent of its 2.7V–20V supply voltage.

How does the enhanced PWM rejection in the INA241A5IDDFR improve motor control reliability?

The INA241A5IDDFR's enhanced PWM rejection holds its output stable for 1µs during fast common-mode transients (e.g., MOSFET switching edges), then attenuates residual disturbances using 104dB AC-CMRR at 100kHz - enabling clean current waveforms even at 125kHz PWM frequencies. This prevents false overcurrent faults and improves FOC accuracy in BLDC motor drives, directly increasing system uptime and efficiency.

Can the INA241A5IDDFR be used for bidirectional current sensing, and how is it configured?

Yes, the INA241A5IDDFR supports true bidirectional sensing via its dual reference inputs (REF1 and REF2). To configure bidirectional operation, connect REF1 to V_S and REF2 to GND - setting the output midpoint at V_S/2. A positive V_SENSE produces output above V_S/2; negative V_SENSE pulls output below V_S/2. This enables single-supply MCU ADC interfacing for regenerative braking or H-bridge current monitoring.

What is the typical quiescent current of the INA241A5IDDFR, and how does it vary with supply voltage?

The INA241A5IDDFR draws 2.5mA typical quiescent current at 25°C, rising to 3.2mA maximum across −40°C to +125°C. Over its 2.7V–20V supply range, I_Q remains stable - varying less than ±5% from 2.5mA at 2.7V to 2.6mA at 20V (per Figure 6-31). This predictable, low-power behavior simplifies thermal design in compact, fanless enclosures like cordless tool battery packs.

Does the INA241A5IDDFR require external compensation components for stability?

No, the INA241A5IDDFR is internally compensated and operates stably with capacitive loads up to 1nF - sufficient for direct connection to most MCU ADC inputs and standard 0.1µF bypass capacitors. Its SOT-23-8 layout and integrated compensation eliminate need for external RC networks, reducing BOM count and PCB area. Layout best practices (short traces, local 1µF ceramic decoupling at Pin 6) are sufficient for noise immunity.