EURO
QUARTZ
FEATURES
Low cost crystal for mass market applications
Surface mount version of HC49-4H crystal
Comprehensie stockholding of standard frequencies
Customized parts readily available
Industry-standard package
Low-profile versions available
49USMX CRYSTALS
49SMD Standard and Low Profile
OUTLINE & DIMENSIONS
DESCRIPTION
49USMX crystals are low profile surface mount crystals that have the
same footprint as standard HC49 or HC49-4H crystals. 49USMD
crystals are ideal for use in low cost, mass-market applications but are
also able to be produced to close tolerances when required.
SPECIFICATION
Frequency Range:
Calibration Tolerance:
Frequency Stability over Temp.
AT-Cut:
BT-Cut:
Operating Temperature Range:
Shunt Capacitance (C0):
Load Capacitance (CL):
Ageing:
3.2MHz to 70MHz
±30ppm at 25°C standard
±10ppm available
±30ppm over -10° ~ +60°*
±100ppm over -10° ~ +60°C*
-10° ~ +60°C to -40° ~ +85°C
4pf typical, 7pF maximum
Series or from 8pF to 32pF
(Customer specified)
±3ppm maximum in first year
±1ppm per year thereafter
(Ta = 25°C, drive 100mW)
100mW typical, 500mW maximum
260°C, 10s maximum
Hermetic seal, resistance weld
EIA 24mm tape and reel
1000 pieces per reel
Compliant
Drive Level:
Reflow Soldering:
Holder:
Packaging:
RoHS Status:
EQUIVALENT SERIES RESISTANCE
Frequency Crystal Cut/
ESR
Range MHz
Mode
Ohms Max.
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
13.0~24.0
24.1~30.0
24.0~48.0
27.0~30.0
30.0~50.0
50.1~70.0
AT-Fund.
AT-Fund.
AT-Fund.
AT-Fund.
AT-Fund.
AT-Fund.
AT-Fund.
AT-Fund.
AT-Fund.
BT-Fund.
AT-3rd OT
AT-3rd OT
AT-3rd OT
300
150
120
100
80
60
50
45
40
40
150
100
80
PART NUMBER GENERATION
Example:
12.000MHz 49USMX/30/50/-20+70/18pF/ATF
Nominal Frequency
Package (height variants):
49USMX (4.2mm)
49USMXL (3.2mm)
49USMXL25 (2.5mm)
Calibration tolerance
at 25°C (±ppm)
Temperature Stability
over temp. range (±ppm)
Operating Temp. Range (°C)
(Lower and upper limits)
Load Capacitance
(Either SR for series or CL in pF)
Crystal Mode
ATF = AT-cut Fundamental
BTF = BT-cut Fundmental
AT3 = AT-cut 3rd Overtone
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 Email: info@euroquartz.co.uk www.euroquartz.co.uk
EUROQUARTZ [ EUROQUARTZ LIMITED ]
