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 euro quartz X4918 series crystals 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 nominal frequency: 32.7680khz calibration tolerance at 25oc: 20ppm 30ppm (standard) 50ppm crystal cut: xy-cut load capacitance (cl): 12.5pf, 9.0pf or 7.0pf equivalent series resistance (esr): 65k w typical, 70k w max. drive level: 1.0 m w max. temperature coefficient: -0.034ppm/c 2 (parabolic) turnover temperature: +255c quality factor: 40,000 min. shunt capacitance: 1.3pf typical motional capacitance: 21ff typical capacitance ration: 619 typical ageing: 3ppm/year max. insulation resistance: 500m w minimum @100vdc operating temperature range: -40 to +85c storage temerature range: -55 to +125c reflow soldering: 10s max. at 250c 10c 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 specification part number and specification stability over temperature x-cut crystal 4.9 x 1.8 x 1.0mm miniature smd 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 order part number: 32.768khz X4918/30/--/-40+85/12.5pf this provides a 32.768khz crystal in x3215 package with 20ppm calibration tolerance at 25c, 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) 32.768khz
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