EURO
QUARTZ
Low-cost, industry-standard crystal unit
AT-Cut strip crystal with hermetically sealed can
Available in two can heights, 3.5mm or 2.5mm
Frequency range 3.2MHz to 70MHz
HC49-4H and HC49-4HL Crystals
3.2MHz to 70.0MHz
Leaded crystal 10.7 x 4.34mm base
Outline and Dimensions
DESCRIPTION
HC49-4H crystals share the same base outline as the industry-
standard HC49 crystal. The crystal uses at AT-cut strip crystal with an
hermetically sealed can. HC49-4H crystals provide a low cost source
of system clock frequency.
SPECIFICATION
Frequency Range:
Oscillation Mode
AT-Cut Fundamental:
AT-Cut 3rd Overtone:
Calibration Tolerance at 25ºC
AT-Cut:
Frequency Stability:
3.2MHz to 70.0MHz
3.2MHz to 30.0MHz
27.0MHz to 70.0MHz
±30ppm (tolerance from
±10ppm is available.)
±30ppm over -10° to +60°C
(Stability from ±10ppm
is available)
Series or from 8pF to 32pF
±3ppm maximum, 1st year,
±1ppm per year thereafter.
100mW typical., 500mW max.
-50° to +105°C
Resistance-weld hermetic seal
Compliant
Bulk pack (Radial tape and reel
is available)
Load Capacitance (CL):
Ageing at 25°C:
Drive Level:
Storage Temperature Range:
Crystal Holder:
RoHS Status:
Supply format:
ESR & OSCILLATION MODE
Frequency
Range MHz
3.2 ~ 3.4
3.5 ~ 6.0
6.1 ~ 10.0
10.1 ~ 30.0
27.0 ~ 30.0
30.1 ~ 50.0
50.1 ~ 70.0
Crystal Cut
ESR
Osc. Mode Ohms Max.
AT-Fund
AT-Fund
AT-Fund
AT-Fund
AT-3rd OT
AT-3rd OT
AT-3rd OT
300
120
60
40
150
100
80
HC49-4H-3L (3 Wire Base - Centre Earth)
PART NUMBERING
Part numbers for HC49-4H crystals are generated as follows:
Example:
8.000MHz HC49-4H/30/50/-20+70/30pF/R30
Frequency
Package
Calibration Tolerance (±ppm)
Temperature Stability (±ppm)
Operating Temp. Range
(°C, Lower Limit/Upper Limit)
Circuit Condition
(CL in pF or 'SR' for Series)
Max. ESR (Ω) Optional
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk
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