R38 RALTRON | Alldatasheet

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Raltron Electronics Corporation 10651 NW 19th St. Miami, Florida 33172 U.S.A. Tel: 305-593-6033 Fax: 305-594-3973 e-mail: sales@raltron.com Internet: http://www.raltron.com TUNING FORK CRYSTAL UNITS SERIES R38, R26, AND R145 3 x 8, 2 x 6, 1 x 5 mm † 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

FEATURES

DESIGNED FOR TIME OF DAY CLOCKS APPLICATIONS SMALL COMPACT SIZE WITH PERFORMANCE AND ECONOMY EXCELLENT SHOCK AND ENVIRONMENTAL CHARACTERISTICS PART NUMBERING SYSTEM R145 R26 R38 SERIES FREQUENCY LOAD CAPACITANCE TOLERANCE EXTENDED TEMPERATURE R38 R26 R145 IN kHz IN pF ±5 PPM ±10 PPM EXT ( ±20 PPM ONLY) -- - - EXAMPLES: R38-32.768-6-10PPM SCALE NONE DIMENSION IN mm/INCH SPECIFICATIONS HOLDER TYPE R38 R26 R145 R38, R26 FREQUENCY TOLERANCE ±5 ±10 ±20 PPM ±5 ±10 ±20 PPM ±5 ±10 ±20 PPM ±5 ±10 ±20 PPM TURNOVER TEMPERATURE 25°C ±5°C 25°C ±5°C 25°C ±5°C 25°C ±5°C PARABOLIC CURVATURE CONSTANT (TYP) †† -0.034 PPM/C² -0.034 PPM/C² -0.034 PPM/C² -0.034 PPM/C² LOAD CAPACITANCE ††† 6 or 12.5 pF 6 or 12.5 pF 8.0 pF 6 or 12.5 pF EQUIVALENT SERIES RESISTANCE (MAX) 35k OHM 35k OHM 40k OHM 30k TO 50k OHM DRIVE LEVEL (TYP) 1.0 µW 1.0 µW 1.0 µW 1.0 µW CAPACITANCE RATIO (TYP) 460 450 400 425 TO 800 AGING (FIRST YEAR MAX) ±3 PPM ±3 PPM ±3 PPM ±5 PPM QUALITY FACTOR (TYP) 90000 70000 80000 FREQUENCY-PACKAGE SPECIFIC INSULATION RESISTANCE (MIN) 500 M OHM 500 M OHM 500 M OHM 500 M OHM OPERATING TEMPERATURE RANGE STORAGE TEMPERATURE RANGE SHOCK RESISTANCE ±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 -40°C TO +85°C -20°C TO +60°C STANDARD -40°C TO +85°C EXTENDED

3.10 MAX

.122 MAX

8.20 MAX

.323 MAX 10.00±1.0 .394±.039

0.35 DIA

.014 DIA 1.10 .043

1.50 MAX

.059 MAX 4.30 .169

5.10 MAX

.201 MAX

0.2 DIA

.008 DIA 0.45 .018

2.10 MAX

.083 MAX

6.20 MAX

.244 MAX

5.6 MIN

.220 MIN 0.70 .028

0.26 DIA

.010 DIA