EURO
QUARTZ
EURO
Low-profile crystal units
Low-cost, industry-standard crystal unit
AT-Cut strip crystal with hermetically sealed can
Frequency range 3.2MHz to 70MHz
Package height options available
DESCRIPTION
HC49-4H and HC49-4HL Crystals
OUTLINES & DIMENSIONS
HC49-4H crystals have 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/Frequency
AT-Cut Fundamental:
AT-Cut 3rd Overtone:
BT-Cut Fundamental:
Calibration Tolerance at 25ºC:
Frequency Stability:
Load Capacitance (CL):
Ageing at 25°C:
Drive Level:
Storage Temperature Range:
Crystal Holder:
RoHS Status:
Supply format:
3.2MHz to 70.0MHz
3.2MHz to 48.0MHz
27.0MHz to 70.0MHz
24.0MHz to 48.0MHz
±5ppm, ±10ppm, ±20ppm or
±30ppm at 25°C
Series or from 8pF to 32pF
±3ppm maximum, 1st year,
±1ppm per year thereafter.
100mW typical, 500mW maximum
-50° to +105°C
Resistance-weld hermetic seal
Compliant
Bulk pack (Radial tape and reel
is available)
ESR and OSCILLATION MODE
Frequency
Range MHz
3.2 ~ 3.4
3.5 ~ 6.0
6.1 ~ 10.0
10.1 ~ 30.0
24.0 ~ 48.0
27.0 ~ 30.0
30.1 ~ 50.0
50.1 ~ 70.0
Crystal Cut
Osc. Mode
AT-Fund.
AT-Fund.
AT-Fund.
AT-Fund.
BT-Fund.
AT-3rd ot
AT-3rd ot
AT-3rd ot
ESR
Ω Max.
300
120
60
40
40
150
100
80
PART NUMBERS
Part numbers for HC49-4H crystals are generated as follows:
Example:
8.000MHz HC49-4H/30/50/-20+70/30pF/30R
Frequency
Package
HC49-4H
HC49-4HL
Calibration tolerance
at 25°C (ppm)
Stability over temp. (ppm)
Operating temp. range (°C)
Circuit Condition
(SR = Series or 10~32pF)
Max ESR (i.e. 30R = 30Ω
max.)
(
)
or 'ATF' or 'BTF' for AT or BT-cut fundamental, 3OT for 3rd overtone
FREQUENCY STABILITY vs OPERATING TEMPERATURE RANGE
Temp. °C/ppm
-10 to +60
-20 to +70
-40 to +85
±10
ü
ASK
X
±15
ü
ü
ü
±20
ü
ü
ü
±25
ü
ü
ü
±30
ü
ü
ü
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 sales@euroquartz.co.uk
www.euroquartz.co.uk
