CFS-308, CFS-206, CFS-145
  FEATURES:
  • Because of their excellent shock resistance and low power consumption, the units are ideal for portable equipment.
  • Features superior characteristics indigenous to tuning fork-type quartz crystal units.
APPLICATIONS:
  • Used as a clock source for communication equipment, AV equipment, OA equipment, measuring instruments and various types of clocks
STANDARD SPECIFICATIONS
Item CFS-308 CFS-206 CFS-145 Conditions
Nominal frequency f0 32.768KHz
Frequency tolerance deltaf/f0 ±20ppm (25°C)
Reference temperature
Frequency vs.Temperature Characteristics deltaf/f0 See drawing -10°C to +60°C
Turnover Temperature Tm 25°C ± 5°C
Temperature coefficient beta -0.034 ± 0.006ppm/°C2
Operating temperature range Topr -10°C to +60°C
Storage temperature range Tstg -40°C to +85°C  
Quality factor Q
 90,000 TYP. 70,000 TYP 80,000 TYP.
Equivalent series resistance R1 35K ohm MAX. 40K ohm MAX. Reference temperature(25°C)
Load capacitance CL 12.5pF TYP. 8.0pF TYP. Please specify
Motional capacitance C1 0.0035pF TYP. 0.0030pF TYP. 0.0025pF TYP.
Shunt capacitance C0 1.60pF TYP 1.35pF TYP. 1.00pF TYP.
Capacitance ratio gamma 460 TYP. 450 TYP. 400 TYP.
Drive level DL 1 µ W MAX.
Insulation resistane IR 500M ohm MIN. DC100V ± 15V
Aging (First year) deltaf/f0 ± 3ppm MAX. 25°C ± 3° C
Hermeticity of seal
1 x 10-2 µ Pa·m3 /s MAX.
Shock resistance ± 5ppm MAX.
Drop test of 3 times on a board from 75cm height or shock test of 3000G x 0.3ms x 1/2sin wave x 3 directions
FREQUENCY vs TEMPERATURE CURVE

DIMENSIONS: (UNIT=mm)