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INA241A

ACTIVE

-5-V to 110-V bidirectional ultraprecise current sense amplifier with enhanced PWM rejection

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Data sheet

INA241A

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 110 Common-mode voltage (min) (V) -5 Input offset (±) (max) (µV) 8, 10, 15, 20 Input offset drift (±) (typ) (µV/°C) 0.05 Features Bidirectional, Enhanced PWM Rejection, Low-side Capable, Ultra precise Rating Catalog Voltage gain (V/V) 10, 20, 50, 100, 200 CMRR (min) (dB) 150 Bandwidth (kHz) 1100 Supply voltage (max) (V) 20 Supply voltage (min) (V) 2.7 Iq (max) (mA) 3.2 Number of channels 1 Gain error (%) 0.01, 0.015 Gain error drift (±) (max) (ppm/°C) 1 Slew rate (V/µs) 8 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 110 Common-mode voltage (min) (V) -5 Input offset (±) (max) (µV) 8, 10, 15, 20 Input offset drift (±) (typ) (µV/°C) 0.05 Features Bidirectional, Enhanced PWM Rejection, Low-side Capable, Ultra precise Rating Catalog Voltage gain (V/V) 10, 20, 50, 100, 200 CMRR (min) (dB) 150 Bandwidth (kHz) 1100 Supply voltage (max) (V) 20 Supply voltage (min) (V) 2.7 Iq (max) (mA) 3.2 Number of channels 1 Gain error (%) 0.01, 0.015 Gain error drift (±) (max) (ppm/°C) 1 Slew rate (V/µs) 8 Operating temperature range (°C) -40 to 125
SOIC (D) 8 29.4 mm² 4.9 x 6 SOT-23-THN (DDF) 8 8.12 mm² 2.9 x 2.8 VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Enhanced PWM rejection optimized for systems subject to switching common-mode voltages
    • Supports switching frequencies up to 125kHz
  • Wide common-mode voltage:
    • Operational voltage: −5V to 110V
    • Survival voltage: −20V to 120V
  • Bidirectional operation
  • High small signal bandwidth: 1.1MHz (at all gains)
  • Slew rate: 8V/µs
  • Step response settling time to 1%: 1µs
  • Excellent CMRR
    • 166dB DC-CMRR
    • 104dB AC-CMRR at 100kHz
    • 89dB 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
  • Package options: SOT23-8, VSSOP-8, SOIC-8,
  • Enhanced PWM rejection optimized for systems subject to switching common-mode voltages
    • Supports switching frequencies up to 125kHz
  • Wide common-mode voltage:
    • Operational voltage: −5V to 110V
    • Survival voltage: −20V to 120V
  • Bidirectional operation
  • High small signal bandwidth: 1.1MHz (at all gains)
  • Slew rate: 8V/µs
  • Step response settling time to 1%: 1µs
  • Excellent CMRR
    • 166dB DC-CMRR
    • 104dB AC-CMRR at 100kHz
    • 89dB 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
  • Package options: SOT23-8, VSSOP-8, SOIC-8,

The INA241x is an ultra-precise, bidirectional current sense amplifier that can measure voltage drops across shunt resistors 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 low offset voltage (±10µV, maximum), small gain error (±0.01%, maximum) and a high DC CMRR (typical 166dB). The INA241x is designed for high voltage, bidirectional measurements in switching systems that see large common-mode voltage transients at the device inputs. The enhanced PWM rejection circuitry inside the INA241x provides minimal signal disturbance at the output due to the common-mode voltage transitions at the input.

The INA241x operates from a single 2.7V to 20V supply, drawing 2.5mA of supply current. The INA241x is available in five gain options: 10V/V, 20V/V, 50V/V, 100V/V, and 200V/V. Multiple gain options allow for optimization between available shunt resistor values and wide output dynamic range requirements.

The INA241x is specified over operating temperature range of −40°C to 125°C.

The INA241x is an ultra-precise, bidirectional current sense amplifier that can measure voltage drops across shunt resistors 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 low offset voltage (±10µV, maximum), small gain error (±0.01%, maximum) and a high DC CMRR (typical 166dB). The INA241x is designed for high voltage, bidirectional measurements in switching systems that see large common-mode voltage transients at the device inputs. The enhanced PWM rejection circuitry inside the INA241x provides minimal signal disturbance at the output due to the common-mode voltage transitions at the input.

The INA241x operates from a single 2.7V to 20V supply, drawing 2.5mA of supply current. The INA241x is available in five gain options: 10V/V, 20V/V, 50V/V, 100V/V, and 200V/V. Multiple gain options allow for optimization between available shunt resistor values and wide output dynamic range requirements.

The INA241x is specified over operating temperature range of −40°C to 125°C.
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Technical documentation

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* Data sheet INA241x –5V to 110V, Bidirectional, Ultra-Precise Current Sense Amplifier With Enhanced PWM Rejection datasheet (Rev. D) PDF | HTML 09 Dec 2024
Application brief Precision Current Sensing in Humanoid Robots PDF | HTML 30 Jun 2025
Design guide 48V, 85A Small Form-Factor Three-Phase Inverter Reference Design for Integrated Motor Drives (Rev. B) PDF | HTML 28 May 2025
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Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024
Application brief Motor Control in Humanoid Robots PDF | HTML 13 Nov 2024
Technical article Simplifying high-voltage sensing with Hall-effect current sensors PDF | HTML 05 Jan 2024
Application brief Current Sensing in Collaborative and Industrial Robotic Arms (Rev. B) PDF | HTML 24 Jul 2023
Application brief Current Mode Control in Switching Power Supplies (Rev. E) PDF | HTML 12 Apr 2023
Application brief Current Sensing in Mobile Robots PDF | HTML 29 Nov 2022
Certificate INA241AEVM EU RoHS Declaration of Conformity (DoC) (Rev. A) 16 Nov 2022
Analog Design Journal Second-sourcing options for small-package amplifiers 26 Mar 2018

Design & development

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Evaluation board

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User guide: PDF | HTML
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Evaluation board

INA241AEVM — INA241x evaluation module for -5-V to 110-V 1.1-MHz current sense amplifier with PWM rejection

INA241AEVM is a small module with five completely independent boards that can be broken off by the designer. Five schematically identical boards are available for each of the five gain variations of the INA241x with inputs up to 110-V common-mode and 10-A (onboard shunt) input capability.

Each board (...)

User guide: PDF | HTML
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Simulation model

INA241A TINA-TI Spice Model

SBOMCA3.ZIP (354 KB) - TINA-TI Spice Model
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Simulation model

INA241A1 PSpice Model

SBOMC99.ZIP (8 KB) - PSpice Model
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Simulation model

INA241A2 PSpice Model

SBOMC92.ZIP (15 KB) - PSpice Model
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Simulation model

INA241A3 PSpice Model

SBOMC95.ZIP (15 KB) - PSpice Model
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Simulation model

INA241A4 PSpice Model

SBOMCA0.ZIP (8 KB) - PSpice Model
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Simulation model

INA241A5 PSpice Model

SBOMCA1.ZIP (8 KB) - PSpice Model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

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Design tool

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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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Reference designs

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Package Pins CAD symbols, footprints & 3D models
SOIC (D) 8 Ultra Librarian
SOT-23-THN (DDF) 8 Ultra Librarian
VSSOP (DGK) 8 Ultra Librarian
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