SBOS808B August 2016  – December 2017 INA240-Q1


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Amplifier Input Signal
        1. PWM Rejection Operation
        2. Signal Bandwidth
      2. 8.3.2Selecting the Sense Resistor (RSENSE)
    4. 8.4Device Functional Modes
      1. 8.4.1Adjusting the Output Midpoint With the Reference Pins
      2. 8.4.2Reference Pin Connections for Unidirectional Current Measurements
        1. Referenced Output
        2. Referenced Output
      3. 8.4.3Reference Pin Connections for Bidirectional Current Measurements
        1. Set to External Reference Voltage
        2. Set to Midsupply Voltage
        3. Set to Mid-External Reference
        4. Set Using Resistor Divider
      4. 8.4.4Calculating Total Error
        1. Sources
        2. Voltage Rejection Ratio Error
          1. Error Example 1
          2. Error Example 2
  9. Application and Implementation
    1. 9.1Application Information
      1. 9.1.1Input Filtering
    2. 9.2Typical Applications
      1. 9.2.1Inline Motor Current-Sense Application
        1. Requirements
        2. Design Procedure
        3. Curve
      2. 9.2.2Solenoid Drive Current-Sense Application
        1. Requirements
        2. Design Procedure
        3. Curve
    3. 9.3Do's and Don'ts
      1. 9.3.1High-Precision Applications
      2. 9.3.2Kelvin Connection from the Current-Sense Resistor
  10. 10Power Supply Recommendations
    1. 10.1Power Supply Decoupling
  11. 11Layout
    1. 11.1Layout Guidelines
      1. 11.1.1Connection to the Current-Sense Resistor
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Documentation Support
      1. 12.1.1Related Documentation
    2. 12.2Related Links
    3. 12.3Receiving Notification of Documentation Updates
    4. 12.4Community Resources
    5. 12.5Trademarks
    6. 12.6Electrostatic Discharge Caution
    7. 12.7Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Orderable Information


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C5
  • Enhanced PWM Rejection
  • Excellent CMRR:
    • 132-dB DC CMRR
    • 93-dB AC CMRR at 50 kHz
  • Wide Common-Mode Range: –4 V to 80 V
  • Accuracy:
    • Gain Error: 0.20% (Maximum) With 2.5 ppm/°C (Maximum Drift)
    • Offset Voltage: ±25 μV (Maximum) With 250 nV/°C (Maximum Drift)
  • Available Gains:
    • INA240A1-Q1: 20 V/V
    • INA240A2-Q1: 50 V/V
    • INA240A3-Q1: 100 V/V
    • INA240A4-Q1: 200 V/V


  • Electronic Power Steering
  • Stability and Traction Control
  • Motor and Actuator Control
  • Solenoid and Valve Control


The INA240-Q1 device is an automotive-qualified, voltage-output, current-sense amplifier with enhanced PWM rejection that can sense drops across shunt resistors over a wide common-mode voltage range from –4 V to 80 V, independent of the supply voltage. The negative common-mode voltage allows the device to operate below ground, accommodating the flyback period of typical solenoid applications. Enhanced PWM rejection provides high levels of suppression for large common-mode transients (ΔV/Δt) in systems that use pulse width modulation (PWM) signals (such as motor drives and solenoid control systems). This feature allows for accurate current measurements without large transients and associated recovery ripple on the output voltage.

This device operates from a single 2.7-V to 5.5-V power supply, drawing a maximum of 2.4 mA of supply current. Four fixed gains are available: 20 V/V, 50 V/V, 100 V/V, and 200 V/V. The low offset of the zero-drift architecture enables current sensing with maximum drops across the shunt as low as 10-mV full-scale. Grade 1 versions are specified over the extended operating temperature range (–40°C to +125°C) and are offered in an 8-pin TSSOP and 8-pin SOIC packages.

Device Information(1)

INA240-Q1TSSOP (8) (2)3.00 mm × 4.40 mm
SOIC (8) 4.00 mm × 3.91 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.
  2. Package is preview only.

Typical Application

INA240-Q1 front-page-motor_bos662.gif

Enhanced PWM Rejection

INA240-Q1 D004_SBOS662.gif

Revision History

Changes from A Revision (December 2016) to B Revision

  • Changed document status from Product Preview to Production Data Go
  • Added Description (cont.) section Go
  • Added preview label to 8-pin TSSOP packageGo
  • Added Figure 40 Go

Changes from * Revision (August 2016) to A Revision

  • Added 8-pin D (SOIC) package for the INA240-Q1 Grade 0 and Grade 1 device Go
  • Added thermal values for the D (SOIC) package in the Thermal Information table Go