www.vishay.com for technical questi ons contact: frequency@vishay.com document number: 35022 8 revision: 17-jun-05 XT38P vishay dale miniature smd watch crystal features ? 2.5 mm height ? industry standard footprint ? long term stability ? tape and reel, 3000 pcs ? 100 % lead (pb)-free and rohs compliant the XT38P is a 2.5 mm height plastic molded 32.768 khz smd crystal unit. this thermoplastic molded rugged part is perfect for your smd applicatio ns in limited circuit space using the watch frequency. dimensions in inches [millimeters] parabolic temperature curve to determine frequency stability, us e parabolic curvature (k). for example: what is stability at 45 c? 1) change in temperature (c) = 45 - 25 = 20 c 2) change in frequency = - 0.042 ppm*( ? c) = - 0.042 ppm*(20) 2 = - 16.8 ppm(max) standard electrical specifications parameter symbol condition unit min typical max frequency range f o khz 32.768 frequency tolerance ? f/f o at 25 c ppm -20 +20 frequency coefficient k parabolic coefficient ppm/c 2 -0.027 -0.035 -0.043 operating temperature range t opr c -40 +85 storing temperature range t stg c -55 +125 shunt capacitance c o pf 1.0 motional capacitance c 1 ff 2.0 load capacitance cl pf 12.5 insulation resistance ir m ? 500 drive level dl w 1.0 aging (first year) fa at 25 c 3 c ppm 3.0 equivalent series resistance(esr) rs k ? 50 ordering information XT38P model a pa d l ayo u t 32.768 khz frequency/khz e6 jedec lead (pb)-free standard #1 #2 #4 #3 0.45 0.08 [1.15 0.2] 0.146 [3.7] max. 0.020 0.04 [0.5 0.1] 0.343 [8.7] max. 0.45 0.08 [1.15 0.2] 0.098 [2.5] max. XT38Pa 0.217 0.04 [5.5 0.1] - 20 - 10 0 10 20 30 40 50 60 70 - 10 - 20 - 30 - 40 - 50 - 60 ? f/f(ppm) temperature ( c) global part number model pa d pac k ag e frequency layout code x t 3 8 p a 2k 7 6 8 a 3 rohs compliant
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