Data Sheet

EURO QUARTZ
CX7SM CRYSTAL
Ultra-Miniature SMD Crystal
14MHz to 250MHz
FEATURES
Designed for infrared, vapour phase or epoxy mounting
Low profile, (<1.2mm) hermetically sealed ceramic package
Excellent ageing characteristics
High shock and vibration resistance
Full military testing available
Available with glass or ceramic lid
Custom designs available
OUTLINE & DIMENSIONS
DESCRIPTION
CX7SM crystals are leadless devices designed for surface mounting.
The ultra-miniature crystals are hermetically sealed in a rugged,
ceramic package. The crystals have a very low profile and small area.
SPECIFICATION
Specifications stated are typical at 25°C unless otherwise indicated.
Specifications may change without notice.
49.0MHz
Motional Resistance R1:
14kΩ
Motional Capacitance C1:
2.4fF
Quality Factor Q:
100,000
Shunt Capacitance:
0.8pF
Standard Calibration Tolerance :
Load Capacitance:
Drive Level:
Frequency Stability2
-10° to +70°C:
-40° to +85°C:
-55° to +125°C:
Ageing First Year:
Shock, Survival4:
Vibration, Survival:
Operating Temperature Range:
1
Storage Temperature Range:
Maximum Process Temperature:
1.
2.
3.
Dim. H
Glass
Lid
Ceramic
Lid
SM1
SM2
SM3
1.14
1.17
1.22
1.27
1.30
1.35
CRYSTAL EQUIVALENT CIRCUIT
±100ppm to ±1000ppm
10pF (or as specified)
200µW maximum
±50ppm to ±10ppm
±100ppm to ±35ppm
±100ppm to ±50ppm
±5ppm maximum
5000g peak, 0.3ms, ½ sine
20g rms, 10~2000Hz random
-10°C to +70°C (Commercial)
-40°C to +85°C (Industrial)
-55°C to +125°C (Military)
-55° to +125°C
+260°C for 20 seconds
Other tolerances available, as low as ±5ppm.
Does not include calibration tolerance. (Frequency stability
characteristics follow that of the AT-Cut thickness-shear mode.)
Higher shock version available.
R1 Motional Resistance
C1 Motional Capacitance
L1 Motional Inductance
C0 Shunt Capacitance
PACKAGING OPTIONS
CX7SM crystals are available either tray packed (<250pcs) or tape
and reel (>250 pieces).
16mm tape, 178mm or 330mm reels (EIA 418).
TERMINATIONS - PLATING
Designation
Termination
SM1
SM2
SM3
Gold Plated
Nickel, Solder Plated
Nickel, Solder Plated and Solder Dipped
HOW TO ORDER CX7SM AT CRYSTALS
CX7 -
S
'S' if special,
custom design.
Otherwise leave
blank
-
C
Blank = glass lid
C = ceramic lid
-
SM1
-
Terminations
SM1 = Gold plated
SM2 = Solder plated
SM3 = Solder dipped
49.0M,
Frequency
M = MHz
50
/
Calibration
Tolerance
@25°C
(in ppm)*
50
/ - /
Frequency
Stability over
Temp. Range
(in ppm)*
I
Temp. Range
C = -10° ~ +70°C
I = -40° ~ +85°C
M = -55° ~ +125°C
S = Customer specified
*Alternative 'total' tolerance (in ppm)
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 [email protected] www.euroquartz.co.uk
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