document number: 35043 for technical questions contact: frequency@vishay.com www.vishay.com revision: 18-oct-07 7 tuning fork crystal XT38T vishay dale the tuning fork type quartz crystal provides ultimate in size, performance and economic trade-offs. so it is used as a clock source in communication equipment, measuring instrument, microprocessor and other time management applications. features ? miniature package ? low cost ? khz frequency ? tight tolerance ? 100 % lead (pb)-free and rohs compliant 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 frequency coefficient k ref to 25 c ppm/( c) 2 - 0.042 operating temperature range t opr c - 10 + 60 storing temperature range t stg c - 20 + 70 shunt capacitance c o pf 0.85 2 motional capacitance c 1 ff 1 2 4 load capacitance cl pf 12.5 insulation resistance ir 100 v dc m 500 drive level dl w 1 aging (first year) fa at 25 c 3 c ppm - 5.0 + 5.0 equivalent series resistance(esr) rs k 35 ordering information XT38T 32.768 khz e2 model frequency/khz jedec lead (pb)-free standard global part number model frequency 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) - 20 - 10 0 1 02 03 04 05 06 070 - 10 - 20 - 30 - 40 - 50 - 60 ? f/f (ppm) tempera ture ( c) x t 3 8 t a 3 2 k 76 8 rohs compliant pac k ag e code t operating temp. dimensions in inches [millimeters] 0.326 [ 8 .2 8 ] max 0.122 [3.1] max 0.354 [9.0] min 0.043 [1.1] 0.012 [0.30]
www.vishay.com for technical questi ons contact: frequency@vishay.com document number: 35043 2 revision: 18-oct-07 XT38T vishay dale tuning fork crystal global part numbering xt9s 20 a na 40m model number load capacitance package code options frequency xt9u = xt49u xt9s = xt49s xt9sl = xt49sl xt9m = xt49m xt9ml = xt49ml xtu1 = xtum1 18 = 18 pf 20 = 20 pf nl = series to be specified by customer tape and reel g = rf5 (xt9u, xt9s, xt9sl) h = rf7 (xt9m, xt9ml) bulk a = b04 (all models) na = no additional options rr = extended temperature of - 40 c to + 85 c contact factory for all other options 4m = 4 mhz 40m = 40 mhz 100m = 100 mhz 12m288 = 12.288 mhz m is used as decimal place holder in frequency example: xt49s-20 40m xt26t t a 32k768 model number operating temperature (otr) pac k ag e code frequency xt26t = xt26t XT38T = XT38T t = - 10 c to + 60 c bulk a = b04 (all models) 32k768 = 32.768 khz k is used as decimal place holder in frequency example: xt26t 32.768k xt57 20 a 40m model number load capacitance pac k ag e code frequency xt57 = xt57c xt46 = xt46c xt36 = xt36c 18 = 18 pf 20 = 20 pf nl = series to be specified by customer tape and reel h = rf7 bulk a = b04 (all models) 4m = 4 mhz 40m = 40 mhz 100m = 100 mhz 12m288 = 12.288 mhz m is used as decimal place holder in frequency example: xt57c-20 40m
document number: 91000 www.vishay.com revision: 18-jul-08 1 disclaimer legal disclaimer notice vishay all product specifications and data are subject to change without notice. vishay intertechnology, inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, ?vishay?), disclaim any and all liability fo r any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. vishay disclaims any and all li ability arising out of the use or application of any product describ ed herein or of any information provided herein to the maximum extent permit ted by law. the product specifications do not expand or otherwise modify vishay?s terms and conditions of purcha se, including but not limited to the warranty expressed therein, which apply to these products. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of vishay. the products shown herein are not designed for use in medi cal, life-saving, or life-sustaining applications unless otherwise expressly indicated. customers using or selling vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify vishay for any damages arising or resulting from such use or sale. please contact authorized vishay personnel to obtain written terms and conditions regarding products designed for such applications. product names and markings noted herein may be trademarks of their respective owners.
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