HC49/4H SMX CRYSTALS
ISSUE 9; 18 OCTOBER 1999
Delivery Options
Common frequencies are available from stock. Please
see p143 for details
Holder Style
HC49/4H SMX crystals are resistance welded, her-
metically sealed in an inert atmosphere with glass to
metal seals securing the lead wires. The lead wires are
formed into a gull wing and mounted on a plastic
former
Lower profiles available, please contact our sales office
General Specifications
Load Capacitance (C
L
): 10pF to 75pF or Series
Drive Level: 0.5mW max
Static Capacitance (C
0
): 9pF max
Ageing: ±3ppm typical per year
Standard Frequencies
3.579545MHz, 3.68640MHz, 4.0MHz,
4.91520MHz, 5.0MHz, 6.0MHz, 7.37280MHz,
8.0MHz, 8.1920MHz, 9.83040MHz, 10.0MHz,
11.05920MHz, 12.0MHz, 14.318180MHz,
14.74560MHz, 15.360MHz, 16.0MHz,
18.4320MHz, 19.66080MHz, 20.0MHz
Standard Frequency Tolerances and Stabilities
±50ppm, ±100ppm
Operating Temperature Ranges
0 to 50°C
–10 to 60°C
–20 to 70°C
–30 to 80°C
Storage Temperature Range
–40 to 85°C
Environmental Specification
Shock: 981m/s
2
for 6ms, three shocks in each direc-
tion along three mutually perpendicular planes
Vibration: 10 to 60Hz 0.75mm displacement, 60 to
500Hz 98.1m/s
acceleration, 30 minutes in each of
three mutually perpendicular planes
Marking
Frequency only
Minimum Order Information Required
Frequency + Holder + Frequency Tolerance @ 25°C
+ Frequency Stability + Operating Temperature
Range + Circuit Condition + Overtone Order
EuropeTel:+44(0)146074433
Fax:+44(0)146072578
162
Americas Tel:+19199410430
Fax:+19199410530
S
Q
Outline in mm (inches)
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Typical Frequency vs Temperature Curves
for various angles of AT-cut crystals
$ %
$ %
& # $ %
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$ %
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Typical Solder Condition - Infrared Reflow