I. Quartz crystal unit also called quartz crystal and the types are 1.HC-49/U 2.HC-49/S HC-49/S-SMD 4.HC-50/U 5.SMD-5*7 6.206 308 309 3010 column quartz crystal unit clock crystal II. Crystal Oscillator also called clock oscillator and the types are 1.SMD-5*7 2.Half size square, DIP-8 3. Full size rectangle, DIP-14 III. Ceramic resonator also called ceramic oscillator and the types are 1.All types of SMD ceramic resonance 2.2 pin ceramic resonance 2pin 3. 3 pin ceramic resonance 3pin 4. ceramic wave filter 5.Ceramic discriminator