Document Number: 35015
For technical questions contact: frequency@vishay.com
www.vishay.com
Revision: 16-Apr-03
1
Resistance Welded Holder Type Crystal Unit
XT49U
Vishay Dale
FEATURES
Low cost
Industry standard
Excellent aging
Wide frequency range
`AT' cut crystal
The XT49U series is an industry standard AT cut crystal
housed in a HC-49U package. It is our standard resistance
weld type quartz crystal.
STANDARD ELECTRICAL SPECIFICATIONS
PARAMETER
SYMBOL
CONDITION
UNIT
MIN
TYPICAL
MAX
Frequency Range
F
O
MHz
1.8432
125
Frequency Tolerance
F/F
O
at 25C
ppm
10
30
50
Temperature Stability
TC
ref to 25C
ppm
10
30
50
Operating Temperature Range
T
OPR
C
- 20
+ 70
Storing Temperature Range
T
STG
C
- 40
+ 85
Shunt Capacitance
C
O
pF
7
Load Capacitance
CL
Customer Specified
pF
10
Series
Insulator Resistance
IR
100V
DC
M
500
Drive Level
DL
W
100
500
Aging
Fa
at 25C, per year
ppm
- 5.0
+ 5.0
DIMENSIONS
in inches [millimeters]
0.403
[10.24] Max
0.192 0.008 [4.88
0.2]
0.435
[11.05] Max
0.183
[4.65] Max
0.500
[12.7] Min
0.150
[3.80] Max
0.017
0.002 [0.43 + 0.05]
0.530
[13.46] Max
EQUIVALENT SERIES RESISTANCE (ESR) AND MODE OF VIBRATION (MODE)
FREQUENCY RANGE (MHZ)
MAX ESR (
)
MODE
FREQUENCY RANGE (MHZ)
MAX ESR (
)
MODE
1.8432 to 1.999
650
Fundamental
6.000 to 7.999
50
Fundamental
2.000 to 2.999
500
Fundamental
8.000 to 12.999
35
Fundamental
3.000 to 3.499
250
Fundamental
13.000 to 32.000
25
Fundamental
3.500 to 3.999
150
Fundamental
24.000 to 29.999
60
3
rd
Overtone
4.000 to 4.999
100
Fundamental
30.000 to 79.999
40
3
rd
Overtone
5.000 to 5.999
80
Fundamental
80.000 to 125.000
90
5
th
Overtone
ORDERING INFORMATION
XT49U
MODEL
R
OTR
Blank = Standard
R = - 40C to + 85C
- 20
LOAD
Blank = Series
- 16 = 16pF
- 20 = 20pF
- 30 = 30pF
- 32 = 32pF
SP
OPTIONS
Blank = Standard
SL = Sleeve
SP = Spacer
4M
FREQUENCY/MHz
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