Standard Electrical Specifications for Membrane Switches

Due to the customized nature and the wide variety of membrane switch designs, it can be somewhat challenging to outline a general set of specifications that covers all membrane switches.  We’ve done our best to to listed below some basic electrical performance specifications.

  • Contact Material: silver, carbon, gold or nickel
  • Voltage: 30 volts DC
  • Rated Current/Voltage: 20mA@30 volts DC resistive load
  • Contact Bounce: < 20 milliseconds
  • Loop Resistance: The loop resistance of a switch is a function of trace width and length. In most applications the maximum loop resistance is less than 100 ohms.
  • Dielectric Strength: 5000V max on polyester material 
  • Open Circuit Resistance: 10 ohms
  • Capacitance: 20 picofarads
  • Maximum Switch Power: 1 watt
  • Operating Temperature: -20°C to +75°C
  • Design Configuration (illustrated below): Common Bus, XY Matrix, or Custom

CSI Keyboards Electrical Layout for Membrane Switches

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