Electronic – Need help to understand DigiKey/Mouser “Switch Function” terminology

switches

I first read Switch Basics from Spark-Fun tutorial to help me better understand how to find what I am looking for using DigiKey/Mouser Advanced search terminology.

I know I am looking for a maintained latching switch where I push once to turn on, push again to turn off.

When I look at the DigiKey/Mouser advanced search under the "Switch Function" section I find:

DigiKey:

  • Off-Mom
  • Off-Mom-Mom
  • On-Mom
  • Mom-On-Off
  • Off-On: Does this mean that the switch is initially off? Then it is on when pushed?
  • On-Off: Does this mean initially On?
  • On-Off, Off-On: Is this a toggle type?
  • On-On-On-Off

Mouser:

  • (ON) – (OFF)
  • OFF – (ON)
  • ON – (OFF)
  • ON – OFF

What is the difference between each function?

Best Answer

Digikey:

Off-Mom         = Continuous OFF momentary ON SPST
Off-Mom-Mom     = Continuous OFF two momentary ONs SPDT
On-Mom          = Continuous ON momentary SPST
Mom-On-Off      = Momentary ON continuous ON and continupus OFF SPDT
Off-On:         = Toggle ON/OFF SPST
On-Off: Toggle  = ON/OFF SPST
On-Off, Off-On: = Toggle ON/OFF DPST inverted poles
On-On-On-Off    = Three continuous ON positions, one continuous OFF position SPTT

Mouser:

(ON) - (OFF) = Momentary both ways
OFF - (ON)   = Momentary ON
ON - (OFF)   = Momentary OFF
ON - OFF     = Toggle
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