TUNING FORK CRYSTAL UNITS
FEATURES
DESIGNED FOR TIME OF DAY CLOCKS APPLICATIONS
SMALL COMPACT SIZE WITH PERFORMANCE AND ECONOMY
EXCELLENT SHOCK AND ENVIRONMENTAL CHARACTERISTICS
SERIES R38, R26, AND R145
3 x 8, 2 x 6, 1 x 5 mm
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
STORAGE TEMPERATURE
RANGE
SHOCK RESISTANCE
STANDARD PART NUMBER
R38
32.768 kHz
±5 ±10 ±20 PPM
25°C ±5°C
-0.034 PPM/C²
6 or 12.5 pF
35k OHM
1.0 µW
0.0035 pF
1.6 pF
460
±3 PPM
90000
500 M OHM
R26
32.768 kHz
±5 ±10 ±20 PPM
25°C ±5°C
-0.034 PPM/C²
6 or 12.5 pF
35k OHM
R145
32.768 kHz
±5 ±10 ±20 PPM
25°C ±5°C
-0.034 PPM/C²
8.0 pF
40k OHM
R38, R26
30.00 kHz TO 153.6 kHz †
±5 ±10 ±20 PPM
25°C ±5°C
-0.034 PPM/C²
6 or 12.5 pF
30k TO 50k OHM
1.0 µW
.001 TO .004 pF
0.8 TO 1.7 pF
425 TO 800
±5 PPM
FREQUENCY-PACKAGE SPECIFIC
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
-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
† 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
R145
1.50 M AX
.059 M AX
R26
2.10 MAX
.083 MAX
R38
3.10 MAX
.122 MAX
8.20 MAX
10.00±1.0
.394±.039
6.20 MAX
5.6 MIN
5.10 M AX
.201 M AX
4.30
.169
.220 MIN
0.26 DIA
.010 DIA
.244 MAX
.323 MAX
0.2 DIA
.008 DIA
0.70
.028
0.35 DIA
.014 DIA
SCALE NONE DIMENSION IN mm/INCH
0.45
.018
1.10
.043
PART NUMBERING SYSTEM
SERIES
R38
R26
R145
-
IN kHz
FREQUENCY
-
IN pF
LOAD
CAPACITANCE
-
TOLERANCE
±5 PPM
±10 PPM
-
EXTENDED
TEMPERATURE
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: sales@raltron.com Internet: http://www.raltron.com
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