The LM219DT is a high-speed dual voltage comparator integrated circuit manufactured by STMicroelectronics. Here is an overview of the LM219DT comparator:


LM219DT Comparator Overview:

  • Manufacturer: STMicroelectronics
  • Part Number: LM219DT
  • Type: High-Speed Dual Voltage Comparator
  • Number of Comparators: 2 comparators in a single IC
  • Package: 14-SOIC (Small Outline Integrated Circuit)
  • DataSheet

    LM219DT PDF

Key Features:

  • Dual Comparator: Contains two independent high-speed comparator circuits in one package.
  • High-Speed Performance: Suitable for applications requiring rapid response times.
  • Low Propagation Delay: Ensures quick and precise comparison of input voltages.
  • Wide Supply Voltage Range: Operates effectively across various voltage levels.

Technical Specifications:

  • Input Offset Voltage: The voltage difference required for the comparator to switch states.
  • Response Time: Fast response times for time-critical applications.
  • Input Common-Mode Voltage Range: The range of voltages that can be applied to the input pins.
  • Output Configuration: Open collector outputs or push-pull outputs for interfacing with various systems.


The LM219DT dual high-speed voltage comparator can be utilized in a range of applications, including:

  • Comparator-based Switching: Precision voltage level detection and control.
  • Analog Signal Processing: High-speed signal comparisons in analog circuits.
  • Pulse Width Modulation (PWM): Generating PWM signals based on input voltage levels.
  • Window Detectors: Monitoring input signals within specific voltage thresholds.
  • Motor Control: Current sensing, fault detection, and phase control in motor control systems.

Working Principle:

  • Comparator Functionality: Compares two input voltages and provides a digital output based on their relative levels.
  • Slew Rate: Determines the maximum rate of voltage change at the output.
  • Hysteresis: Some comparators offer hysteresis to prevent oscillations and improve noise immunity.


  • For detailed information on electrical characteristics, application circuits, and recommendations, refer to the datasheet provided by STMicroelectronics for the LM219DT comparator.
  • When using high-speed comparators, attention must be paid to signal integrity, noise considerations, and proper decoupling techniques.

The LM219DT dual high-speed voltage comparator from STMicroelectronics is designed for applications requiring rapid response times, high-speed signal processing, and precise voltage comparisons. Its dual-channel configuration makes it suitable for various analog and digital circuit designs where speed and accuracy are crucial.