THROUGH-HOLE CRYSTALS
HC49/4H CRYSTALS
DESCRIPTION
HC49/4H crystals share the same base dimensions as the industry-
standard HC49 crystal but with a low profile can. The crystal utilizes an
AT-cut strip crystal with a hermetically sealed metal can. HC49/4H
crystals provide a low-cost solution for many applications, particularly
where PCB height is restricted.
OUTLINES & DIMENSIONS
FEATURES
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Very low cost crystal
Available with 3.5mm (standard) or 2.5mm height
AT-cut strip crystal with hermetically sealed metal can
Comprehensive Euroquartz stockholding
Ideal crystal for height-limited PCBs
GENERAL SPECIFICATION
Frequency Range:
Oscillation Mode
AT-cut Fundamental:
BT-cut Fundamental:
AT-cut Third Overtone:
Calibration Tolerance at 25ºC
AT-cut:
3.2MHz to 70MHz
3.2MHz to 30.0MHz
24.0MHz to 48.0MHz
27.0MHz to 70.0MHz
±30ppm (Tolerance to ±10ppm
is also available)
BT-cut:
±30ppm
Frequency stability over temperature
AT-cut:
±30ppm over -10° to +60°C
(Tolerance ±10ppm over -10° to
+60°C is also available)
BT-cut:
±100ppm over-10° to +60°C
Load Capacitance:
8pF to 32pF or Series (Specify)
Ageing:
±3ppm max 1st year,
±1ppm max per year after
Drive level:
500mW max
Static capacitance (C0):
7pF maximum
TEMPERATURE STABILITY
Sample curves for AT-cut and BT-cut strip crystals
OSCILLATION MODE & ESR
Frequency
(MHz)
3.2 ~ 3.4
3.5 ~ 4.0
4.1 ~ 4.9
5.0 ~ 5.9
6.0 ~ 8.9
9.0 ~ 9.9
10.0 ~ 12.9
13.0 ~ 30.0
24.0 ~ 40.0
40.1 ~ 48.0
30.1 ~ 50.0
50.1 ~ 70.0
Crystal Cut/
Oscillation Mode
AT Fund.
AT Fund.
AT Fund.
AT Fund.
AT Fund.
AT Fund.
AT Fund.
AT Fund.
BT Fund.
BT Fund.
AT 3rd.
AT 3rd.
ESR (max)
(Ohms)
300
150
120
100
80
60
50
40
40
30
100
80
PART NUMBER GENERATION
HC49/4H crystal part numbers are derived as follows:
Example:
24.000MHz HC49/4H/30/50/10/30pF/ATF
Frequency Holder/Calibration/Temp. Stability/ Temp. Range/Circuit
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 1460 230000 Fax: +44 1460 230001 email: info@euroquartz.co.uk web: www.euroquartz.co.uk
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