CMR250T Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – CMR250T

Citizen Crystals and Oscillators - CMR250T
Page 1 of 2
CMR250T
FEATURES:
(2,000pcs/reel)
z Because of their excellent shock resistance and low power
consumption, the units are ideal for portable equipment.
z Features superior characteristics indigenous to tuning fork-type quartz
crystal units.
z Ideal for low cost SMD applications.
z Provided in Tape and Reel.
APPLICATIONS:
z Permits use as a clock source for communication equipment, AV
equipment, OA equipment, measuring instruments and pagers.
STANDARD SPECIFICATIONS
Item
CM250T
Conditions
Nominal frequency
f0
30kHz to165kHz
Frequency tolerance delta f/f0
± 30ppm
At 25°C
Frequency
vs.Temperature
Characteristics
delta f/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
-40°C to + 85°C
Storage temperature
range
Tstg
-55°C to +125°C
Equivalent series
resistance
R1
35k ohm to 50k ohm
At 25°C
Load capacitance
CL
12.5pF TYP.
Please specify
Motional capacitance C1
0.001 to 0.004pF TYP.
Shunt capacitance
C0
0.8 to1.7pF TYP.
Capacitance ratio gamma
425 to 800 TYP.
Drive level
DL
1 µ W MAX.
Insulation resistance IR
500M ohm MIN.
DC100V ± 15V
Aging (First year) delta f/f0
± 5ppm MAX.
25°C ± 3°C
Sealing
1 x 10-2 µ Pa·m3 /s MAX.
Shock resistance
±5ppm MAX.
Drop test of 3 times on a hard board from 75cm height or shock test of 3000G x 0.3ms x
1/2sin wave x 3 directions
FREQUENCY vs TEMPERATURE CURVE
http://www.citizencrystal.com/quartz/crystals/cmr250t_d.htm
4/2/2003