Halogen-Free Switches Target Limited-Space Tasks

C and K Components has enhanced its KMT Series tactile switches for space-constrained applications using halogen-free materials. KMT series switches are said to be one of industry's smallest top-actuated tactile devices, suiting them to use in applications such as mobile phones, medical products, MP3 accessories and Bluetooth headsets. Measuring 2.6 x 3 x 0.65mm with a 0.45mm body height, the ultra-miniature, ultra-high-reliability tactile switch conforms to all environmental requirements.

Halogen-free plastics are fully recyclable, so the switches enable customers to meet their commitments to the environment. Featuring an integrated push plate and a ground-pin option for ESD protection, the SPST NO switches are available with gold and silver plating options and are specified for 150,000 electrical and mechanical life cycles. Actuator height is 0.2mm and travel is 0.13mm. The integrated actuator allows for simpler button design while yielding a tactile ratio of 30 per cent (min), providing sharp feedback.

Actuation force options are 1.6N (tactile ratio 30 per cent) for mobile devices and 1N (tactile ratio 10 per cent) for hearing aids and headsets. Operating temperature ranges from -40 to 85C. In a three-way partnership with a hearing-aid manufacturer, TTI and C and K have produced a version of the KMT for hearing aids. Due to improved plating of the metallic surfaces of the KMT0xx series switch, the devices need less sealing against aggressive body liquids, such as sweat.

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