Citizen Crystals and Oscillators - CMR250T Page 1 of 2 CMR250T (2,000pcs/reel) FEATURES: z z z z 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. Ideal for low cost SMD applications. 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 Nominal frequency Frequency tolerance Frequency vs.Temperature Characteristics CM250T f0 delta f/f0 delta f/f0 Conditions 30kHz to165kHz ± 30ppm At 25°C 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 12.5pF TYP. Please specify 0.001 to 0.004pF TYP. Shunt capacitance CL C1 C0 Capacitance ratio gamma 425 to 800 TYP. Drive level DL 1 µ W MAX. Insulation resistance IR delta f/f0 500M ohm MIN. DC100V ± 15V ± 5ppm MAX. 25°C ± 3°C Motional capacitance Aging (First year) Sealing Shock resistance 0.8 to1.7pF TYP. 1 x 10-2 µ Pa·m3 /s MAX. ±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 Citizen Crystals and Oscillators - CMR250T Page 2 of 2 DIMENSIONS: (UNIT=mm) RECOMENDED SOLDERING PATTERN: (UNIT=mm) http://www.citizencrystal.com/quartz/crystals/cmr250t_d.htm 4/2/2003