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A membrane switch is a multilayered switch device that is touch activated to make or break the electrical connection of a particular switch element. Membrane switches have become popular for use in industrial controls, home appliances, office equipment and automotive applications. Most often, membrane switches are designed for intended use as keyboard, key pad, or front panel interfaces to provide instructions from a user to operate various items, such as computers, manufacturing equipment and vending machines. Membrane switches normally employ a pair of stacked flexible membranes having opposed contacts printed on their facing surfaces. An intermediate layer is disposed between the outer two layers and acts to isolate the switch circuit patterns from each other. Electrical conductors, also printed on the facing surfaces of the membranes, communicate electrical signals to and from the contacts. Finger pressure applied to the switch pushes a conductive pad on the membrane into contact with a similar pad on the substrate. Contact between the pads closes the switch and completes the electrical circuit. Membrane switches are particularly well-suited for use in certain environments wherein it is desired to seal an electronic system against moisture, dust etc. Membrane switches have recently come into wide use for the keypads of cellular phones or portable personal computers or the various control panel switches of household electrical appliances.
Physical Characteristics
Life Cycles 2 million minimum non-tactile
1 million minimum tactile (Poly Dome)
Operating Force 2 to 6 oz. typical non-tactile
10 to 18 oz. typical tactile
Overall Thickness .028" typical non-tactile
.026" typical tactile
Environmental Characteristics
Operating/Storage Temp -40 to +65 standard
-40 to +85 available
Thermal Shock no effect after 100 cycles from -40 to +65°C
Humidity no effect after exposure to 95% RH at 40°C
for 504 hours (non-tactile)
Electrical Characteristics
Contact Resistance: 100 ohms maximum typical
Open Circuit Resistance: 5 x 106 ohms minimum
Contact Rating: 30 VDC maximum, 100 mA maximum, 1 watt maximum
Contact Bounce: 10 ms maximum
Contact Material: Silver to silver |
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| membrane switch, membrane switches, membrane keypad, membrane circuits |
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| Company : |
Trotai Technologies Co., Ltd. |
| Email: |
Contact us |
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| Country : |
China |
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