ATK205: 12×12 Tact switch (flat)

Yellow Plunger Tactile Switch, SPST-NO 50 mA @ 24 V dc 3mm

  • Manufacturer: Omron
  • Product ID: B3F-4005

There are loads of manufacturers of 12mm x 12mm tact switches however AuthentiKit designs are all based around the Omron B3F series, This is the flat type as opposed to ATK204 which is the projected button type. Total height 4.3mm, with lugs at the bottom.

Supplier Links

Indicative Pricing With Allowance for P&P

RS Online only sell in minimums of 5 but you can get them individually on Amazon/Ebay with free postage.



I would stick to Omron. The dimensions and shape need to be exactly the same. Still there are other variants that will work - for example it doesn't matter what the operating force is or whether you go for fancy gold plated options. Here's a link to the manufacturer specs.