quartz crystal resonator

      A quartz crystal unit (also known as a quartz crystal resonator or commonly labeled as Xtal, External Crystal Oscillator, as the crystal unit is often connected externally to an electronic circuit) is an electronic component that utilizes the piezoelectric effect of a quartz crystal (also known as crystal) to generate high-precision oscillation frequency. It is a passive component composed mainly of a quartz chip, a base, a shell, silver paste, silver, and other components. Depending on the lead situation, it can be divided into two types: through-hole (with leads) and surface mount (without leads). Currently, the main packaging models include HC-49U, HC-49/S, GLASS, UM-1, UM-4, UM-5, and SMD. SMD is the development trend of crystals, and the model is also trending towards miniaturization, such as 3225, 2016, 1612, etc.