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Texas Instruments INA241x/INA241x-Q1 Current Sense Amplifiers

Texas Instruments INA241x/INA241x-Q1 Current Sense Amplifiers are ultra-precise, bidirectional current sense amplifiers that can measure voltage drops across shunt resistors. This measurement is done over a wide common-mode range from -5V to 110V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of small gain error (±0.01%, maximum), low offset voltage (±10µV, max), and a high DC CMRR (typical 166dB). The Texas Instruments INA241x/INA241x-Q1 is designed for high-voltage, bidirectional measurements in switching systems that see large common-mode voltage transients at the device’s inputs. The enhanced PWM rejection circuitry inside the INA241x/INA241x-Q1 ensures minimal signal disturbance at the output due to the common-mode voltage transitions at the input. The INA241x-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Enhanced PWM rejection optimized for systems subject to switching common-mode voltages
    • Supports switching frequencies up to 125kHz
  • Wide common-mode voltage
    • -5V to 110V operational voltage
    • -20V to 120V survival voltage
  • Bidirectional operation
  • High small signal bandwidth (1.1MHz (at all gains))
  • 8V/µs slew rate
  • Step response settling time to 1% (1µs)
  • Excellent CMRR
    • 166dB DC-CMRR
    • 104dB AC-CMRR at 100kHz
    • 89 dB AC-CMRR at 1MHz
  • Accuracy
    • Gain error (maximum)
      • Version A: ±0.01%, ±1ppm/°C drift
      • Version B: ±0.1%, ±5ppm/°C drift
    • Offset voltage (maximum)
      • Version A: ±10µV, ±0.1µV/°C drift
      • Version B: ±150µV, ±0.5µV/°C drift
  • Available gains
    • INA241A1, INA241B1: 10V/V
    • INA241A2, INA241B2: 20V/V
    • INA241A3, INA241B3: 50V/V
    • INA241A4, INA241B4: 100V/V
    • INA241A5, INA241B5: 200V/V
    • INA241A1-Q1 : 10V/V
    • INA241A2-Q1 : 20V/V
    • INA241A3-Q1 : 50V/V
    • INA241A4-Q1 : 100V/V
    • INA241A5-Q1 : 200V/V
  • SOT23-8, VSSOP-8 package options

Applications

  • Motor drives
  • Solenoids and actuators
  • Injection molding machine
  • Cordless power tools
  • Medical cordless tools
  • Drone propeller speed control

Datasheets

Functional Block Diagram

Block Diagram - Texas Instruments INA241x/INA241x-Q1 Current Sense Amplifiers

Associated Eval Module

Texas Instruments INA241xEVM Evaluation Module

Offers five completely independent boards the designer can break off.

Learn Moreabout Texas Instruments INA241xEVM Evaluation Module View Productsrelated to Texas Instruments INA241xEVM Evaluation Module
Published: 2022-10-21 | Updated: 2025-08-22