TUNING FORK CRYSTAL UNITS SERIES R38, R26, AND R145 3 x 8, 2 x 6, 1 x 5 mm 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 (TYP) †† LOAD CAPACITANCE ††† EQUIVALENT SERIES RESISTANCE (MAX) DRIVE LEVEL (TYP) MOTIONAL CAPACITANCE (TYP) SHUNT CAPACITANCE (TYP) CAPACITANCE RATIO (TYP) AGING (FIRST YEAR MAX) QUALITY FACTOR (TYP) INSULATION RESISTANCE (MIN) OPERATING TEMPERATURE RANGE R38 32.768 kHz ±5 ±10 ±20 PPM 25°C ±5°C R26 32.768 kHz ±5 ±10 ±20 PPM 25°C ±5°C R145 32.768 kHz ±5 ±10 ±20 PPM 25°C ±5°C R38, R26 30.00 kHz TO 153.6 kHz † ±5 ±10 ±20 PPM 25°C ±5°C -0.034 PPM/C² -0.034 PPM/C² -0.034 PPM/C² -0.034 PPM/C² 6 or 12.5 pF 6 or 12.5 pF 8.0 pF 6 or 12.5 pF 35k OHM 35k OHM 40k OHM 30k TO 50k OHM 1.0 µW 0.0035 pF 1.6 pF 460 ±3 PPM 90000 500 M OHM 1.0 µW 1.0 µW 0.003 pF 0.0025 pF 1.35 pF 1.0 pF 450 400 ±3 PPM ±3 PPM 70000 80000 500 M OHM 500 M OHM -20°C TO +60°C STANDARD -40°C TO +85°C EXTENDED STORAGE TEMPERATURE RANGE 1.0 µW .001 TO .004 pF 0.8 TO 1.7 pF 425 TO 800 ±5 PPM FREQUENCY-PACKAGE SPECIFIC 500 M OHM -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 R38-32.768-12.5 R26-32.768-12.5 R145-32.768-12.5 SEE PART NUMBERING SYSTEM SHOCK RESISTANCE STANDARD PART NUMBER † COMMON FREQUENCIES ARE: 31.250 kHz, 31.500 kHz, 40.00 kHz, AND 76.800 kHz †† FREQUENCY DEVIATION AT T IS GIVEN AS: ∆ f/f = K(To - T)², WHERE K IS PARABOLIC CURVATURE CONSTANT ††† OTHER LOAD CAPACITANCES ARE AVAILABLE OUTLINE DRAWINGS R26 R38 2.10 MAX 3.10 MAX .122 MAX 8.20 MAX .394±.039 .244 MAX 10.00±1.0 5.6 MIN .220 MIN 5.10 M AX .201 M AX .169 4.30 6.20 MAX .083 MAX .323 MAX 1.50 M AX .059 M AX R145 0.26 DIA 0.35 DIA .014 DIA .010 DIA 0.2 DIA .008 DIA 0.70 .028 0.45 .018 SCALE NONE DIMENSION IN mm/INCH 1.10 .043 PART NUMBERING SYSTEM SERIES R38 R26 R145 LOAD CAPACITANCE FREQUENCY - IN kHz IN pF EXTENDED TEMPERATURE TOLERANCE ±5 PPM ±10 PPM - EXT ( ±20 PPM ONLY) EXAMPLES: R38-32.768-6-10PPM R26-32.768-12.5-EXT 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