Texas Instruments INA241B2IDDFR

Overview

INA241B2IDDFR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 20V/V fixed gain, −5V to 110V operational common-mode range, ±150µV max input offset voltage, 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 INA241B2IDDFR datasheet, INA241B2IDDFR pinout, INA241B2IDDFR application, or INA241B2IDDFR equivalent, this page delivers verified specifications, SOT-23-8 package details, real-world use cases in solenoid control and drone propulsion, and validated alternative options for precision current sensing in industrial and portable battery-powered systems.

Technical Context

The INA241B2IDDFR employs a zero-drift, multistage amplifier architecture enabling 1.1MHz bandwidth at all gains 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 large ΔV/Δt edges, then leveraging high AC-CMRR (104dB @ 100kHz) for subsequent suppression.

It supports bidirectional operation via dual reference inputs (REF1/REF2), allowing configurable output centering from GND to VS; input bias current remains stable at 35µA (typ) across −20V to 120V survival common-mode range, independent of VCM - critical for low-leakage shunt measurements in high-side, low-side, or inline configurations.

Key Specifications

Pinout & Package

INA241B2IDDFR is housed in an 8-pin SOT-23 package (DDF), measuring 2.9mm × 2.8mm, with exposed pad for thermal enhancement and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA241B2IDDFR, INA240A2IDR offers design flexibility at the cost of higher layout sensitivity and reduced transient immunity, while MAX40056ATA+T trades common-mode range and PWM robustness for marginally higher bandwidth - making INA241B2IDDFR the optimal choice for 48V+ industrial motor control where accuracy under switching noise is non-negotiable.

Availability

INA241B2IDDFR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, and drone propulsion systems requiring stable component supply, long-term production continuity, and guaranteed traceability for ISO 9001-certified manufacturing.

Supply support for INA241B2IDDFR 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 family was designed specifically for high-voltage, high-noise current sensing in next-generation motor control, energy storage, and portable power systems - emphasizing ultra-precision, transient immunity, and seamless integration into compact, thermally constrained designs.

FAQ

What is the maximum common-mode voltage the INA241B2IDDFR can withstand continuously?

The INA241B2IDDFR operates continuously over −5V to 110V common-mode voltage. Its survival rating extends to −20V to 120V, meaning it tolerates short-duration transients (e.g., load dump) beyond operational limits without damage - confirmed in Absolute Maximum Ratings section of SBOSA30D datasheet.

Does the INA241B2IDDFR require external components for basic operation?

Yes - the INA241B2IDDFR requires a 0.1µF ceramic bypass capacitor between V_S and GND, and proper RF filtering on IN+/IN− if used in high-EMI environments. REF1 and REF2 must be configured (e.g., one tied to VS, one to GND) to establish output reference; NC pin must be grounded. No gain-setting resistors are needed since gain is fixed at 20V/V.

How does the enhanced PWM rejection in INA241B2IDDFR improve system reliability?

The INA241B2IDDFR's enhanced PWM rejection holds its output for 1µs during large common-mode dV/dt events (e.g., MOSFET switching), then uses 104dB AC-CMRR to attenuate residual transients - preventing false overcurrent trips in motor drives. This eliminates need for additional RC filtering or digital debouncing, reducing BOM count and firmware complexity in safety-critical loops.

Can INA241B2IDDFR measure bidirectional current with a single shunt resistor?

Yes - INA241B2IDDFR supports true bidirectional sensing using one shunt by configuring REF1 and REF2 to set output midpoint (e.g., REF1 = VS, REF2 = GND → VOUT = 10V at zero current for 20V supply). Output swings above/below midpoint proportionally to forward/reverse current, enabling regenerative braking detection in drones and EVs without polarity-switching circuitry.

What is the thermal performance of INA241B2IDDFR in SOT-23-8 (DDF) package?

In DDF package, INA241B2IDDFR has R_θJA = 129.7°C/W and R_θJB = 52.6°C/W. At 2.5mA I_Q and 5V supply, power dissipation is ~12.5mW, resulting in <1.7°C junction rise above ambient - well within −40°C to 125°C operating range. Layout with thermal vias under exposed pad further improves heat transfer in compact motor-control PCBs.