We are using this audio jack in our design. I am having trouble understand the schematic of this audio jack. My understanding is that

  1. Pin 5 and Pin 4 : Audio left and right
  2. Pin 2 or Pin 3 : Ground or Mic
  3. Pin 1: detect

Can anyone confirm my understanding? I think that the switch is normally open and pin 3 will short with pin 1 when the jack is inserted. Audio Jack

  • \$\begingroup\$ Unless you want us to say something about the drawing or the footprint, perhaps you could crop the other 4/5 of the image out so we can read the schematic symbol with ease. \$\endgroup\$
    – Samuel
    Jan 16, 2014 at 7:28
  • \$\begingroup\$ @Samuel Right click, select View Image from the context menu (I'm assuming that you're using Firefox). You'll get a larger image. \$\endgroup\$ Jan 16, 2014 at 7:41

2 Answers 2


I always use this standard here, that its the same the Nokia and Apple use:

enter image description here

With this schematic, I think that maybe the pins 2 and 3 can be shorted when the jack is inserted.


My interpretation of the circuit symbol is

  • 1 = ground
  • 2,3,4 = tip contacts
  • 5 = switch, closed to 4 when NO plug is inserted

What the tip contacts are used for is not determined by the component but by convention and/or the exact device you want to use.


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