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  • Application Design Guidelines for LM339, LM393, TL331 Family Comparators Including the New B-versions

    • SNOAA35F April   2019  – December 2024 LM2901 , LM2901B , LM2901B-Q1 , LM2903 , LM2903-Q1 , LM2903B , LM2903B-Q1 , LM339 , LM339-N , LM393 , LM393-N , LM393B , LM397 , TL331 , TL331-Q1 , TL331B

       

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  • Application Design Guidelines for LM339, LM393, TL331 Family Comparators Including the New B-versions
  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Devices Covered in Application Note
    1. 1.1 Base Part Numbers
    2. 1.2 Input Voltage Offset Grades
    3. 1.3 Maximum Supply Voltage
    4. 1.4 High Reliability Options
  5. 2 The New TL331B, TL391B, LM339B, LM393B, LM2901B and LM2903B B Versions
  6. 3 PCN's to Change Classic Die to a New Die Design
    1. 3.1 PCN #1 for Single and Dual (TL331 and LMx93/LM2903)
    2. 3.2 PCN #2 for Single and Dual (TL331 and LMx93/LM2903)
    3. 3.3 PCN For Quad (LMx39, LM2901)
    4. 3.4 PCN for B Devices (including -Q1's)
    5. 3.5 Device PCN Summary
    6. 3.6 Determining Die Version Used
      1. 3.6.1 Determine Die Used for Single TL331 and Dual LM293, LM393, and LM2903 - PCN #1 (Ji3)
      2. 3.6.2 Determine Die Used for Single TL331 and Dual LM293, LM393, and LM2903 - PCN #2 (TiB)
      3. 3.6.3 Determine Die Used for Quad LM139, LM239, LM339, and LM2901
      4. 3.6.4 Determine Die Used for Post-PCN B Devices
  7. 4 Changes to Package Top Markings
  8. 5 Roughened Leadframe Finish
  9. 6 Input Considerations
    1. 6.1  Input Stage Schematic – The Classic LM339 Family
    2. 6.2  Input Stage Schematic - New "B" and TiB Devices
    3. 6.3  Differences Between the Classic, "B" and Tib Die Devices
    4. 6.4  Input Voltage Range
    5. 6.5  Input Voltage Range vs. Common Mode Voltage Range
    6. 6.6  Reason for Input Range Headroom Limitation
    7. 6.7  Input Voltage Range Feature
    8. 6.8  Both Inputs Above Input Range Behavior
    9. 6.9  Negative Input Voltages
      1. 6.9.1 Maximum Input Current
      2. 6.9.2 Phase Reversal or Inversion
      3. 6.9.3 Protecting Inputs from Negative Voltages
        1. 6.9.3.1 Simple Resistor and Diode Clamp
        2. 6.9.3.2 Voltage Divider with Clamp
          1. 6.9.3.2.1 Split Voltage Divider with Clamp
    10. 6.10 Power-Up Behavior
    11. 6.11 Capacitors and Hysteresis
    12. 6.12 Output to Input Cross-Talk
  10. 7 Output Stage Considerations
    1. 7.1 Output VOL and IOL
    2. 7.2 Pull-Up Resistor Selection
    3. 7.3 Short Circuit Sinking Current
    4. 7.4 Pulling Output Up Above Vcc
    5. 7.5 Negative Voltages Applied to Output
    6. 7.6 Adding Large Filter Capacitors To Output
  11. 8 Power Supply Considerations
    1. 8.1 Supply Bypassing
      1. 8.1.1 Low VCC Guidance
      2. 8.1.2 Split Supply use
  12. 9 General Comparator Usage
    1. 9.1 Unused Comparator Connections
      1. 9.1.1 Do Not Connect Inputs Directly to Ground
      2. 9.1.2 Unused Comparator Input Connections
      3. 9.1.3 Leave Outputs Floating
      4. 9.1.4 Prototyping
  13. 10PSpice and TINA TI Models
  14. 11Conclusion
  15. 12Related Documentation
    1. 12.1 Related Links
  16. 13Revision History
  17. IMPORTANT NOTICE
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Application Note

Application Design Guidelines for LM339, LM393, TL331 Family Comparators Including the New B-versions

Abstract

The TL331, LM339, LM393, and the next generation B-versions (TL331B, LM339B, LM2901B, LM393B, and LM2903B) are a popular and long-lived family of standard comparators due to the flexibility, availability, and cost-effectiveness. Understanding how these comparators are different than most other comparators before using them in your design helps to promote first time design successes. The front page of the B data sheets contains a table showing the differences in specifications between the various classic devices and the new B device.

Trademarks

All trademarks are the property of their respective owners.

 
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