Technical Data（1）Frequency

Frequency usually refers to the nominal frequency, that is, resonant frequency regulated by contracts and products specification. Frequency scope can be gained by oscillation mode and crystal holder of different size.

Generally speaking, the smaller the crystal holder is, the higher the frequency is.

See table one:

Holder type           Oscillation mode            Frequency range (MHz)

HC-49U    AT Fundamental               1.8432-25   

                     AT 3rd Overtone                20-70

                     AT 5th Overtone                50-150

HC-49S   AT Fundamental               3.579-27

                            AT 3rd Overtone                20-65

                     AT 5th Overtone                50-150

SMD7050   AT Fundamental                6-33

                      AT 3rd Overtone                33-100

SMD5032   AT Fundamental                12-44

                       AT 3rd Overtone                35-100

The possibility to realize should be taken into consideration when choosing products, if it exceeds the possible scope, the cost will increase dramatically or become impossible to produce. When frequency nears the lowest limit of crystal holder, it is suggested to communicate with the supplier.

FL: Load Resonant Frequency

   Under specified conditions, quartz crystal components are in parallel or series with load capacitance. When the combination of impedance presents resistivity, load resonant frequency is one of the two kinds of frequency.