Texas Instruments INA241A3IDR

Overview

INA241A3IDR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 50V/V fixed gain, −5V to 110V common-mode input range, ±10µV max offset voltage, ±0.01% max gain error, and enhanced PWM rejection up to 125kHz - deployed in motor drives and cordless power tools for accurate inline current monitoring under fast transients.

For engineers reviewing the INA241A3IDR datasheet, INA241A3IDR pinout, INA241A3IDR application, or INA241A3IDR equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in bidirectional high-side sensing, and confirmed alternative options for precision current measurement in industrial and portable battery-powered systems.

Technical Context

The INA241A3IDR employs a zero-drift, multistage amplifier architecture enabling 1.1MHz bandwidth at all gains while maintaining 166dB DC-CMRR and 104dB AC-CMRR at 100kHz - critical for rejecting fast common-mode transients in PWM-driven motor control. Its input bias current remains constant (35µA typ) across −20V to 120V survival range, independent of V_CM.

It supports configurable unidirectional or bidirectional output via dual reference pins (REF1/REF2), allowing mid-supply output offset for bidirectional sensing or rail-referenced output for unidirectional use - with output swing to within 70mV of V_S and 20mV above GND under load.

Key Specifications

Pinout & Package

INA241A3IDR is packaged in an 8-pin SOIC (D package), 4.9mm × 6mm body with standard JEDEC outline. Pin functions are identical across SOIC-8, VSSOP-8, and SOT-23-8 variants per TI SBOSA30D.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3IDR and INA2290A3IDR, the INA241A3IDR uniquely combines 110V common-mode capability, 125kHz PWM rejection, and programmable reference architecture - making it the only option for precision bidirectional sensing in high-voltage, high-noise industrial motor and actuator systems.

Availability

INA241A3IDR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, drone ESCs, and injection molding machine actuators requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA241A3IDR 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-reliability industrial ICs.

The INA241x product line was designed specifically for ultra-precise, high-common-mode, bidirectional current sensing in noisy switching environments - targeting motor control, battery systems, and industrial automation where PWM rejection and zero-drift stability are non-negotiable.

FAQ

What is the maximum common-mode voltage the INA241A3IDR can withstand continuously?

The INA241A3IDR operates continuously from −5V to 110V common-mode input voltage. Its survival rating extends to −20V to 120V, meaning it tolerates brief transients within that range without damage. This allows direct high-side sensing on 48V, 60V, and 96V industrial buses without external attenuation or isolation.

Does the INA241A3IDR require external calibration for gain or offset over temperature?

No. The INA241A3IDR features a zero-drift architecture with ±10µV max offset and ±0.01% max gain error at room temperature, and drifts only ±0.1µV/°C and ±1ppm/°C across −40°C to 125°C. These specs are guaranteed by design and testing - no system-level calibration is needed for most precision applications.

How does the enhanced PWM rejection in the INA241A3IDR improve motor control reliability?

The INA241A3IDR suppresses output disturbance from fast common-mode edges (up to 125kHz) by holding its output stable for 1µs after each edge, then attenuating residual transients via 104dB AC-CMRR. This prevents false overcurrent trips and preserves clean current waveforms for FOC algorithms - unlike conventional amplifiers that exhibit ringing or offset shifts during PWM switching.

Can the INA241A3IDR be used for unidirectional current sensing, and how is the output configured?

Yes. For unidirectional sensing, tie both REF1 and REF2 to GND - this configures the output to swing from ~20mV to V_S−70mV, representing 0A to full-scale current. Alternatively, tie both to V_S for inverted unidirectional output. No external components are needed; the internal reference divider handles offset setting.

What package options are available for the INA241A3IDR, and which one is in stock at Aetrix Electronics?

The INA241A3IDR is offered in SOIC-8 (D), VSSOP-8 (DGK), and SOT-23-8 (DDF) packages. Aetrix Electronics currently stocks the SOIC-8 variant (INA241A3IDR), which provides optimal thermal performance (R_θJA = 122.9°C/W) and ease of manual or automated assembly in industrial PCB layouts.