1) Khz rnage Crystal unit ( tuning fork)
As for the most famous frequency of kHz range crystal units, there is 32.768 kHz.
kHz range Crystal units is called tuning fork crystal units,because it is uses a tuning fork crystal chip
part no.: FC-12M, FC-13E, FC-135, FC-145, FC-255, MC-146, MC-156, MC-306, MC-405, MC-406, MC-30A, C-001R, C-002RX, C-004R, C-005R, C-2-TYPE, C-4-TYPE ... .etc
for more informaion and detail specification, please refer to http://www.epsontoyocom.co.jp/english/product/Crystal/index.html
2) Mhz range Crystal unit (AT)
This is the crystal unit that is used to clock of integrated circuit etc.
MHz range Crystal units is called AT crystal units.
part no.: FA-118T, FA-128, FA-20H, FA-23A FA-238, FA-238V, TSX-3225, TSX-4025,TSX-5032, MA-306, MA-406, MA-505, MA-506, CA-301 series ... .etc
for more informaion and detail specification, please refer to http://www.epsontoyocom.co.jp/english/product/Crystal/at1.html
3) Resonator (Saw)
This is a crystal device that employs a SAW (surface acoustic wave) in order to output a particular resonating frequency as an electrical signal. The element is for a high frequency range (at least several hundred MHz).
part no. NS-21R, NS-32R, FS-335, FS-555, FS-585... .etc
for more informaion and detail specification, please refer to http://www.epsontoyocom.co.jp/english/product/Crystal/saw.html
Automotive application, Industurial application , Game, GPS/PND