TUNING FORK CRYSTAL UNITS SERIES R38, R26 LEAD FREE FEATURES DESIGNED FOR TIME OF DAY CLOCKS APPLICATIONS SMALL COMPACT SIZE WITH PERFORMANCE AND ECONOMY EXCELLENT SHOCK AND ENVIRONMENTAL CHARACTERISTICS SPECIFICATIONS HOLDER TYPE NOMINAL FREQUENCY FREQUENCY TOLERANCE TURNOVER TEMPERATURE PARABOLIC CURVATURE CONSTANT † LOAD CAPACITANCE EQUIVALENT SERIES RESISTANCE DRIVE LEVEL MOTIONAL CAPACITANCE SHUNT CAPACITANCE CAPACITANCE RATIO AGING(FIRST YEAR MAX) QUALITY FACTOR INSULATION RESISTANCE OPERATING TEMPERATURE RANGE STORAGE TEMPERATURE RANGE R38 R26 32.768 kHz ±5 PPM, ±10 PPM, AND ±20 PPM(STANDARD) 25° ± 5°C -0.034 PPM/ ∆ C² TYP 6 to 12.5 pF 35k OHM MAX 1.0 µw TYP 0.0035 pF TYP 1.6 pF TYP 460 TYP 0.003 pF TYP 1.35 pF TYP 450 TYP ±3 PPM 90000 TYP 70000 TYP 500 M OHM MIN -20°C TO +60°C STANDARD -40°C TO +85°C EXTENDED -40°C TO +85°C ±5 PPM MAXIMUM 75 cm DROP TEST IN 3 AXES ONTO A HARD SURFACE OR 3000 g x 0.3 ms x ½ SINEWAVE IN 3 AXES SHOCK RESISTANCE STANDARD PART NUMBER R38-32.768-12.5-NPB R26-32.768-12.5-NPB † FREQUENCY DEVIATION AT T IS GIVEN AS: ∆ f/f = K(To - T)², WHERE K IS PARABOLIC CURVATURE CONSTANT NOTE1-Through hole device, can withstand 260°C soldering by terminals only OUTLINE DRAWINGS R26 2.10 MAX 10.00 .244 MAX 6.20 MAX .323 MAX .083 MAX .394±.004 10.00±0.1 8.20 MAX 3.10 MAX .122 MAX .394 R38 0.26 DIA 0.35 DIA .014 DIA .010 DIA 0.70 .028 1.10 .043 SCALE NONE DIMENSION IN mm/INCH PART NUMBERING SYSTEM SERIES R38 R26 FREQUENCY - 32.768 LOAD CAPACITANCE IN pF TOLERANCE - ±5 PPM ±10 PPM - EXTENDED TEMPERATURE EXT (±20 PPM ONLY) LEAD FREE NPB EXAMPLES: R38-32.768-6-10PPM-NPB R26-32.768-12.5-EXT-NPB Raltron Electronics Corporation 10651 NW 19th St. Miami, Florida 33172 U.S.A. Tel: 305-593-6033 Fax: 305-594-3973 e-mail: [email protected] Internet: http://www.raltron.com