For technical reasons all crystals in a plastic package have to be encapsulated in a metal cylinder. Therefore the crystals have to be extremely small, resulting in considerable design and production difficulties.
In spite of this, Epson says it has succeeded in a great leap to miniaturise these crystals. It says this became possible by intensive research and design by using extremely small tuning fork crystals, resulting in a unique coating technology for the crystal electrodes. This technology is said to dramatically reduce the danger of electrode shorting, which is always inherent in the very small electrode structures on a tuning fork. Reliability as well as yield are greatly enhanced due to this patented technology, claims the company.
The MC-146 is a compact SMD crystal unit designed for portable equipment like cellular phones where small component size is important. Using a newly developed package for high density mounting, the occupation area (including land pattern) of the MC-146 is the smallest in the industry while its height is 0,1 mm less than Epson's previous model.
The specifications are frequency, 32,768 kHz; operating temperature, -40 to +85°C; serial resistance, 65 ky; frequency tolerance, ±20, ±50 ppm; load capacity, 7,0 pF; and external dimensions, 6,9 x 1,4 x 1,3 mm3.
For further information contact Mutronics, (011) 608 1460.
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