EURO
QUARTZ
2.0 x 1.6 x 0.6mm SMD
Frequency range 20MHz to 54MHz, fundamental mode
Ultra-miniature package 2.0 x 1.6 x 0.6mm
Packaged in standard EIA tape and reel
Exceptionally low ageing
High shock and vibration resistance
Ideal for PDAs, hand-held GPS, PCMCIA etc.
DESCRIPTION
X21 crystals are ultra-miniature AT-cut crystals covering the frequency
range 20MHz to 54MHz in fundamental mode. Their exceptionally
small size (2.0 x 1.6mm) and low mass coupled with high shock and
vibration resistance makes these crystals ideal for miniaturized
handheld equipment and similar high-density applications.
OUTLINE & DIMENSIONS
X21 CRYSTALS
20.0MHz to 54.0MHz
SPECIFICATION
Frequency Range
AT-Cut Fundamental:
Calibration Tolerance at 25ºC:
Frequency stability
-10° to +60°C
-20° to +70°C
-40° to +85°C
Storage Temperature:
Equivalent Series Resistance:
Shunt Capacitance (C0):
Load Capacitance (CL):
Ageing:
Drive level:
Reflow Soldering:
Packaging:
20.0MHz to 54.0MHz
±10ppm, ±20ppm or ±30ppm
from ±5ppm
(contact Euroquartz)
from ±10ppm
from ±15ppm
-50°~+105°C
See table
2pF to 4pF typical, 5pF maximum
Series or from 8pF to 32pF
<±3ppm per year at +25°C
10 µW typ., 100 µW max.
10s maximum at 260°C twice
or 180s at 230°C, once.
EIA tape and reel
Note: The entire crystal package may be grounded via the top
metal lid and pads 2 and 4 on the underside of the unit.
PART NUMBER GENERATION
EQUIVALENT SERIES RESISTANCE
Frequency
Range MHz
20.0~30.0
30.1~54.0
ESR
Ω Max.
120
80
Part numbers for X21 crystals are generated as follows:
Example:
24.000MHz X21/10/30/-10+60/12pF/80R
Nominal Frequency
Package
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)
Equivalent Series Resistance
(Optional - use when special
value is required)
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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