Research on Miniaturization of Low - Frequency Range SMD Crystal Unit

In this paper, the realization of miniature design for low-frequency for SMD crystal units has been presented. Increasing progress towards miniaturization of electronics part which includes ultra-small crystal units have evolved significantly in the last few years. However, miniaturization for crystal units categorically excluded designs for specific low-frequencies due to its extreme difficulties. This research explains the difficulties and introduce the a SMD crystal unit that is until recently unable to realize this complicated low-frequency (8 MHz ~ 4 MHz range) in a package measuring 8.0 times 4.5 times 1.8 mm which employs the thickness-shear vibration mode that features superior temperature characteristic.