SBOSA78 March   2026 INA1H182-SEP

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Setting the Gain
        1. 6.3.1.1 Gain Drift
      2. 6.3.2 EMI Rejection
      3. 6.3.3 Input Common-Mode Range
      4. 6.3.4 Input Protection
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Reference Pin
      2. 7.1.2 Input Bias Current Return Path
    2. 7.2 Typical Applications
      1. 7.2.1 Resistor Temperature Detector Signal Conditioning Circuit
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Procedure
        3. 7.2.1.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.3.4 Input Protection

The inputs of the INA1H182-SEP device are individually protected for voltages up to ±20V beyond the supply rails. For example, a condition of –20V on one input and +20V on the other input does not cause damage. Internal circuitry on each input provides low series impedance under normal signal conditions. If the input is overloaded, the protection circuitry limits the input current to a safe level.

INA1H182-SEP Input Current Path During an Overvoltage ConditionFigure 6-8 Input Current Path During an Overvoltage Condition

During an input overvoltage condition, current flows through the input protection diodes into the power supplies, as shown in Figure 6-8. If the power supplies are unable to sink current, then Zener diode clamps (ZD1 and ZD2 in Figure 6-8) must be placed on the power supplies to provide a current pathway to ground. Figure 6-9 shows the input current for input voltages from –40V to +40V when the INA1H182-SEP is powered by ±9V supplies.

INA1H182-SEP Input Current vs Input OvervoltageFigure 6-9 Input Current vs Input Overvoltage