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INA241A

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

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Data sheet

INA241A

ACTIVE
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Product details

Product type Analog output Common-mode voltage (max) (V) 110 Common-mode voltage (min) (V) -5 Input offset (±) (max) (µV) 10 Input offset drift (±) (typ) (µV/°C) 0.05 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 Number of channels 1 Comparators (#) 0 Gain error (%) 0.01 Gain error drift (±) (max) (ppm/°C) 1 Slew rate (V/µs) 5 Features Bi-directional, Enhanced PWM Rejection, Ultra precise Rating Catalog 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) 10 Input offset drift (±) (typ) (µV/°C) 0.05 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 Number of channels 1 Comparators (#) 0 Gain error (%) 0.01 Gain error drift (±) (max) (ppm/°C) 1 Slew rate (V/µs) 5 Features Bi-directional, Enhanced PWM Rejection, Ultra precise Rating Catalog Operating temperature range (°C) -40 to 125
SOT-23-THN (DDF) 8 8.12 mm² 2.9 x 2.8
  • Enhanced PWM rejection optimized for systems subject to switching common-mode voltages
    • Supports switching frequencies up to 125 kHz
  • Wide common-mode voltage:
    • Operational voltage: −5 V to +110 V
    • Survival voltage: −20 V to +120 V
  • Bidirectional operation
  • High small signal bandwidth: 1.1 MHz (at all gains)
  • Slew rate: 8 V/µs
  • Step response settling time to 1%: 1 µs
  • Excellent CMRR
    • 166 dB DC-CMRR
    • 104 dB AC-CMRR at 100 kHz
    • 89 dB AC-CMRR at 1 MHz
  • Accuracy:
    • Gain error (maximum)
      • Version A: ±0.01%, ±1 ppm/°C drift
      • Version B: ±0.1%, ±5 ppm/°C drift
    • Offset voltage (maximum)
      • Version A: ±10 µV, ±0.1 µV/°C drift
      • Version B: ±150 µV, ±0.5 µV/°C drift
  • Available gains:
    • INA241A1, INA241B1 : 10 V/V
    • INA241A2, INA241B2 : 20 V/V
    • INA241A3, INA241B3 : 50 V/V
    • INA241A4, INA241B4 : 100 V/V
    • INA241A5, INA241B5 : 200 V/V
  • Package options: SOT23-8, VSSOP-8
  • Enhanced PWM rejection optimized for systems subject to switching common-mode voltages
    • Supports switching frequencies up to 125 kHz
  • Wide common-mode voltage:
    • Operational voltage: −5 V to +110 V
    • Survival voltage: −20 V to +120 V
  • Bidirectional operation
  • High small signal bandwidth: 1.1 MHz (at all gains)
  • Slew rate: 8 V/µs
  • Step response settling time to 1%: 1 µs
  • Excellent CMRR
    • 166 dB DC-CMRR
    • 104 dB AC-CMRR at 100 kHz
    • 89 dB AC-CMRR at 1 MHz
  • Accuracy:
    • Gain error (maximum)
      • Version A: ±0.01%, ±1 ppm/°C drift
      • Version B: ±0.1%, ±5 ppm/°C drift
    • Offset voltage (maximum)
      • Version A: ±10 µV, ±0.1 µV/°C drift
      • Version B: ±150 µV, ±0.5 µV/°C drift
  • Available gains:
    • INA241A1, INA241B1 : 10 V/V
    • INA241A2, INA241B2 : 20 V/V
    • INA241A3, INA241B3 : 50 V/V
    • INA241A4, INA241B4 : 100 V/V
    • INA241A5, INA241B5 : 200 V/V
  • Package options: SOT23-8, VSSOP-8

The INA241x is an ultra-precise, bidirectional current sense amplifier than can measure voltage drops across shunt resistors over a wide common-mode range from –5 V to 110 V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of low offset voltage (±10 µV, maximum), small gain error (±0.01%, maximum) and a high DC CMRR (typical 166 dB). The INA241x 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 ensures minimal signal disturbance at the output due to the common-mode voltage transitions at the input.

The INA241x operates from a single 2.7 V to 20 V supply, drawing 2.5 mA of supply current. The INA241x is available in five gain options: 10 V/V, 20 V/V, 50 V/V, 100 V/V, and 200 V/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 and is offered in a space-saving 8-pin SOT-23 and 8-pin VSSOP package.

The INA241x is an ultra-precise, bidirectional current sense amplifier than can measure voltage drops across shunt resistors over a wide common-mode range from –5 V to 110 V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of low offset voltage (±10 µV, maximum), small gain error (±0.01%, maximum) and a high DC CMRR (typical 166 dB). The INA241x 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 ensures minimal signal disturbance at the output due to the common-mode voltage transitions at the input.

The INA241x operates from a single 2.7 V to 20 V supply, drawing 2.5 mA of supply current. The INA241x is available in five gain options: 10 V/V, 20 V/V, 50 V/V, 100 V/V, and 200 V/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 and is offered in a space-saving 8-pin SOT-23 and 8-pin VSSOP package.
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Technical documentation

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Type Title Date
* Data sheet INA241x –5 V to 110 V, Bidirectional, Ultra-Precise Current Sense Amplifier With Enhanced PWM Rejection datasheet (Rev. A) PDF | HTML 29 Aug 2022
Application note Current Sensing in Collaborative and Industrial Robotic Arms (Rev. A) PDF | HTML 19 Apr 2023
Application note Current Mode Control in Switching Power Supplies (Rev. E) PDF | HTML 12 Apr 2023
Application note Current Sensing in Mobile Robots PDF | HTML 29 Nov 2022
EVM User's guide INA241xEVM User's Guide (Rev. A) PDF | HTML 17 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

For additional terms or required resources, click any title below to view the detail page where available.

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

CS-AMPLIFIER-ERROR-TOOL — Current sense amplifier comparison and error tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
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Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

This bidirectional current sensing solution uses a current-sense amplifier and a high-speed dual comparator with a rail-to-rail input common mode range to create over-current (OC) alert signals at the comparator outputs (OUTA and OUTB) if the input current (IG1) rises above 100 A or falls below (...)
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Design tool

CIRCUIT060037 — Precision over-current latch circuit

This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The (...)
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Simulation tool

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

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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Package Pins Download
SOT-23-THN (DDF) 8 View options
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