EURO
QUARTZ
Ultra-Miniature SMD Crystal
FEATURES
Ultra-miniature SMD package 1.55 x 0.95 x 0.35mm
Frequency Range 30MHz ~ 50MHz
High shock and vibration resistance
Hermetically sealed
Available with glass or ceramic lid
Tight calibration tolerance
Custom designs available
CX18SM AT CRYSTAL
30MHz to 50MHz
OUTLINE & DIMENSIONS
DESCRIPTION
CX18SM crystals are designed for applications where miniaturization
is paramount. The rugged crystal is ideally suited for a wide variety of
high frequency applications including medical electronics, cardiac
rhythm management, pacemakers for example. Also auitable for
cochlear implants, infusion pumps and wildlife tracking.
Dim. H
SM1
SM2
SM3
SM4
SM5
Glass
Lid
0.35
0.37
0.42
0.37
0.42
SPECIFICATION
Specifications stated are typical at 25°C unless otherwise indicated.
Specifications may change without notice.
Fundamental Frequency:
Motional Resistance R (Ω):
Motional Capacitance C1 (fF):
QualityFactor Q (k):
Shunt Capacitance C0 (pF):
Standard Calibration Tolerance
1
:
Load Capacitance:
Drive Level:
Frequency Stability
1,2
-10° to +70°C:
-40° to +85°C:
-55° to +125°C:
Ageing, First Year:
Shock, Survival:
Vibration, Survival
3
:
Operating Temperature Range:
50.0MHz
60
1.2
44
0.6
±100ppm or tighter as required.
10pF (or
as specified)
200µW maximum
±50ppm to ±10ppm
±100ppm to ±20ppm
±100ppm to ±30ppm
±5ppm maximum
(Better than ±1ppm available)
5000g, 0.3ms, ½ sine
20g rms, 10~2000Hz swept sine
-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
TERMINATIONS - PLATING
Designation
Termination
SM1
SM2
SM3
SM4
SM5
Gold Plated (Lead Free)
Solder Plated
Solder Dipped
Solder Plated (Lead Free)
Solder Dipped (Lead Free)
CRYSTAL EQUIVALENT CIRCUIT
Storage Temperature Range:
Maximum Process Temperature:
1.
2.
3.
R1 Motional Resistance
C1 Motional Capacitance
L1 Motional Inductance
C0 Shunt Capacitance
Other tolerances available, contact Euroquartz sales
Does not include calibration tolerance. (Frequency stability
characteristics follow that of the AT-Cut thickness-shear mode.)
Per MIL-STD-202G, Method 204D, Condition D. Random
vibration testing also available.
PACKAGING OPTIONS
CX18SM AT crystals are available either tray packed (<250pcs) or
tape and reel (>250 pieces).
12mm tape, 178mm or 330mm reels (EIA 418).
HOW TO ORDER CX18SM AT CRYSTALS
CX18 - S
'S' if special,
custom design.
Otherwise leave
blank
-
_
Blank = glass lid
-
SM1
-
50.0M,
Frequency
M = MHz
100
Calibration
Tolerance
@25°C
(in ppm)*
/ 100 / - /
Frequency
Stability over
Temp. Range
(in ppm)*
I
Terminations
SM1 = Gold plated *
SM2 = Solder plated
SM3 = Solder dipped
SM4 = Solder plated *
SM5 = Solder dipped *
* = Lead free
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
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