BTC foam and foil

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BTC foam and foil
Switch recognition--BTC--U mount.svg
Manufacturer BTC
Switch type Linear, tactile
Sense method Capacitive
Keycap mount Cherry MX mount
Key Tronic or similar

BTC foam and foil is a foam and foil switch from BTC.


As the capacitive mechanism provides no force, a spring or buckling rubber sleeve is placed under the keycap. BTC keyboards are generally readily identifiable by the rear label and the use of a 1.25 unit escape key. However, the discrete foam and foil modules are (typically, if not always) BTC branded on the top.


Force curve

Bothy linear and tactile versions exist. As with Key Tronic foam and foil, the linear version uses a helical spring under the keycap, while the tactile version uses a buckling rubber sleeve.

Keycap mount

These switches are most commonly found with Cherry MX mount sliders, but Key Tronic–shape sliders were also used.[1] Whether these sliders are compatible with Key Tronic keycaps is not confirmed. The Cherry MX mount sliders are externally identical to those of the more common BTC dome with slider switch.

Switch mount

Some BTC foam and foil keyboards use discrete slider modules along with a mounting plate, while others have the slider guide shafts moulded into the top case.


The sliders come in various colours including white, pink, and cyan.[2] At least two slider colours may be found within the same keyboard, distributed at random.[3]


  • BTC 53 series (linear and tactile; Cherry MX mount)
  • BTC 5060 (linear; Cherry MX and Key Tronic–like/compatible mount)
  • BTC 5100 (tactile; Cherry MX mount)
  • BTC 5151 (linear; Key Tronic–like/compatible mount)



The BTC 5151 PCB has exposed pads, so the foam discs in theory will be insulated. This is a linear example with helical springs.

The BTC 5060 PCB does however have solder mask over the pads. The design of the slider modules is different to those in the BTC 5151.


The following pictures are from a BTC 5100. This example is tactile and uses buckling rubber sleeves.


  1. Geekhack — Blue Chip BTC-5060 vs non-branded version? Posted 2014-09-13. Retrieved 2015-07-23.
  2. — Keyboard reference photos
  3. Deskthority — NIB BTC Keyboards [Swedish doubleshots - MX compatible]