Membrane Keypads Water Resistant

Membrane keypads, by the very nature of their construction, afford a high degree of protection against the intrusion of fluids into both the membrane switch and the electronic components which often reside behind membrane keypads. However, there are applications where a higher degree of water resistance is required. It is for these types of applications that Xymox has developed water resistant membrane keypads.

Membrane Keypads Water Resistance Definition

Water resistant membrane keypads can withstand a minimum of 48 hours of submersion in water while cycled from 40°C to 65°C at one hour intervals, while 5 volts minimum is being applied across the switch. Membrane keypads which maintains functionality and shows no sign of water penetration into the switch while under these conditions would be considered water resistant.

Membrane Keypads Construction

The Xymox approach to producing a water resistant membrane switch, as it is described above, incorporates proprietary adhesives, dielectrics and assembly processes which eliminate ports of entry for water while providing a maximum adhesive seal.

Membrane Keypads Mechanicals

• Life Cycles: >2,000,000
• Switch Thickness: .030" - .050" typ.
• Switch Travel: .005" - .010" typ. (Non-tactile)

Environmental

• Storage: -40°C to 75°C
• Operating: -40°C to 70°C

Electrical Characteristics (Switch Circuit)

• Contact Resistance: varies proportionately with part size, typically 100 Ohms or less. Resistance values are typical through the life of the switch.
• Open Circuit Resistance: 5 x 106 Ohms minimum.
• Contact Rating: 30 VDC maximum, 100mA maximum, 1 watt maximum
• Contact Bounce: 1ms nominal, 20ms maximum at 3,000,000 activation cycles.

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