EURO
QUARTZ
Ultra-Miniature SMD Crystal
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
CX7SM CRYSTAL
14MHz to 250MHz
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
1
:
Load Capacitance:
Drive Level:
Frequency Stability
2
-10° to +70°C:
-40° to +85°C:
-55° to +125°C:
Ageing First Year:
Shock, Survival
4
:
Vibration, Survival:
Operating Temperature Range:
±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
Dim. H
SM1
SM2
SM3
Glass
Lid
1.14
1.17
1.22
Ceramic
Lid
1.27
1.30
1.35
CRYSTAL EQUIVALENT CIRCUIT
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).
Storage Temperature Range:
Maximum Process Temperature:
1.
2.
3.
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.
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
-
C
Blank = glass lid
C = ceramic lid
-
SM1
-
49.0M,
Frequency
M = MHz
50
/
50
/ - /
I
'S' if special,
custom design.
Otherwise leave
blank
Terminations
SM1 = Gold plated
SM2 = Solder plated
SM3 = Solder dipped
Calibration
Tolerance
@25°C
(in ppm)*
Frequency
Stability over
Temp. Range
(in ppm)*
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 info@euroquartz.co.uk www.euroquartz.co.uk
