Weartech-Components & Hardware

Offering a package size of just 4.5 x 4.5mm, the TL3305 miniature SMT tact switch has a surface mount termination, and two operating forces to choose from. The switch from E-Switch has an operating lifecycle of up to 500,000. It also offers multiple actuator lengths from 3.8 to 7.0mm.
Applications include wearable technology, telecommunications, consumer electronics, audio/visual, medical devices, testing and instrumentation, computer and peripherals.
Electrical rating is 50mA at 12V DC, with a contact resistance of 100m? (max). Insulation resistance is 100M? (min) at 100V DC, with a dielectric strength of 250V AC for one minute. Operating temperature is -20 to 70°C.
http://www.e-switch.com

Based on breakthrough ESD technology, the XGD Series Xtreme-Guard ESD suppressor are available in 0402- and 0603-sized, flat-topped surface mount packages from Littelfuse.
They protect sensitive electronics against ESD as high as 30kV and are suitable for high voltage applications up to 32V DC. They can absorb repetitive ESD strikes nearly four times the maximum level specified in the IEC61000-4-2 international standard without performance degradation, claims the company. Extremely low capacitance makes them suitable for use in high-frequency and high-speed data, video, antenna and I/O circuits.
According to the company, even after multiple ESD strikes, it exhibits low current leakage (less than 1nA), ensuring minimal power losses, for battery-powered electronics, like wearables. Both sizes offer much higher voltage ratings than other ESD suppressors with similar board footprints, claims the company and they offer greater ESD protection than many TVS diodes while providing lower capacitance and leakage current and higher voltage ratings.