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Florian Ruess is your contact for tactile switches at RAFI

Florian Ruess

Ravensburger Str. 128–134
D-88276 Berg/Ravensburg
P +49 751 89-6500

Phone Kontakt
versiegelte leitplatte mit Kurzhubtaster

MEDIA ROBUST ELECTRONICS

PCB protection
  1. Home
  2. Ι HMI
  3. Ι Tactile switches
  4. Ι Media robust electronics

In numerous fields of application, electronic components and assemblies must be specially sealed in order to be protected against the effects of water, condensate, dust or dirt. A special challenge for the sealing process of printed circuit boards is their assembly with electromechanical components such as tactile switches. In the following, we present the three most common processes, conformal coating,potting and dip coating.
 

Conformal Coating

In conformal coating, a distinction is made between dip coating and selective coating with a spray head. With selective coating, only critical components and contacts can be coated, thus saving costs by using less material. Coating protects against condensation or contamination and also provides ESD protection. In the case of MICON and RACON, the flexible pressure piece should be left out during coating, as otherwise coating particles can flake off when the button is subsequently actuated.

beschichteter Druckknopf
ummantelte Leitplatte

Potting

In potting, the printed circuit board is partially or completely filled with a medium which offers not only excellent protection in constant humidity but also mechanical protection in case of vibration and improved heat dissipation. This can significantly extend the lifetime of the electronics. The new generation MICONs and RACONs (sealed) can now be effectively enclosed up to the defined potting height and continue to function reliably thereafter.

DIP COATING

Dip coating is usually applied in an immersion process in which the assembled circuit board is immersed in a basin. The coating material penetrates into every corner of the assembly in order to provide the best possible protection for the circuit board. A thin layer of just 400 nm is sufficient to reliably protect the electronics from malfunctions and moisture. However, using this type of coating on tactile switches is a challenge – but MICON as well as RACON are ideally suited for exactly this purpose.

Nanotechnologie-Beschichtung Leiterplatte
Conformal Coating
  • 20-50 µm
  • transparent
  • ESD protection
  • protection against condensation


Protection level
middle


Process
selective and dip coating


Costs
low


Flexibility to change
flexible


Repairability
NO

Potting
  • from 1 mm
  • protection against constant humidity
  • mechanical protection during vibration and improved heat dissipation


Protection level​​​​​​
high


Process
mold filling


Costs
high


Flexibility to change
inflexible


Repairability
NO

Dip coating
  • 400 nm
  • transparent
  • protection against condensation

     

Protection level
low


Process
dipping


Costs
low


Flexibility to change
flexible


Repairability
YES

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