Data Sheet

EURO QUARTZ
X4918 SERIES CRYSTALS
4.9 x 1.8 x 1.0mm Miniature SMD
32.768kHz
Ultra-miniature ceramic package 4.9 x 1.8 x 1.0mm
RoHS compliant and lead free
Low ageing, high shock and vibration resistance
Uses include battery operated equipment
DESCRIPTION
X4918 crystals provide 32.768kHz in an ultra-miniature package. The
part is designed to provide a small component size for real-time clock
applications. The micro-miniature size and rugged construction make
them ideal for real time clocks and battery powered, hand-held
equipment.
OUTLINE & DIMENSIONS
SPECIFICATION
Nominal Frequency:
Calibration Tolerance at 25ºC:
32.7680kHz
±20ppm
±30ppm (standard)
±50ppm
Crystal Cut:
XY-cut
Load Capacitance (CL):
12.5pF, 9.0pF or 7.0pF
Equivalent Series Resistance (ESR): 65kW typical, 70kW max.
Drive level:
1.0mW max.
Temperature Coefficient:
-0.034ppm/°C2 (Parabolic)
Turnover Temperature:
+25°±5°C
Quality Factor:
40,000 min.
Shunt Capacitance:
1.3pF typical
Motional Capacitance:
21fF typical
Capacitance Ration:
619 typical
Ageing:
±3ppm/year max.
Insulation Resistance:
500MW minimum @100VDC
Operating Temperature Range:
-40° to +85°C
Storage Temerature Range:
-55° to +125°C
Reflow Soldering:
10s max. at 250°C ±10°C
Shock Resistance:
±5ppm max, free drops x3 from
75cm height onto hard wood
surface.
Packaging:
12.0mm EIA tape, 4.0mm pitch,
180mm diameter reel, 3k
pieces/reel
STABILITY OVER TEMPERATURE
X-Cut Crystal
PART NUMBER AND SPECIFICATION
Order part number: 32.768kHz X4918/30/--/-40+85/12.5pF
This provides a 32.768kHz crystal in X4918 package with ±20ppm
calibration tolerance at 25°C, temperature stability according to the
above parabolic coefficient at a load capacitance of 12.5pF.
Options:
Calibration Tolerance:
±20ppm
±30ppm (standard)
±50ppm
Load Capacitance:
7.0pF
9.0pF
12.5pF (standard)
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