actual size crystal unit s p ecifications ( characteristics ) item symbol s p ecifications conditions / remarks FC-135 FC-135 fc-255 fc-255 nominal frequency range f_nom 32.768 khz 32 khz to 77.5 khz 32.768 khz 32 khz to 100 khz please contact us about available frequencies. storage temperature t_stg -55 ? c to +125 ? c storage as single product. operating temperature t_use -40 ? c to +85 ? c level of drive dl 0.5 ? w (1.0 ? w max.) 0.5 ? w max. please contact us if you require 1.0 ? ? 20 ? 10 -6 +25 ? c, dl=0.1 ? w please ask for ti g hter tolerance turnover temperature ti +25 ? c ? 5 ? c parabolic coefficient b -0.04 ? 10 -6 / ? c 2 max. load capacitance cl 7 pf, 9 pf, 12.5 pf 7 pf, 12.5 pf please specify motional resistance (esr) r1 70 k ? max. 70 k ? ? 65 k ? max. 70 k ? to 30 k ? motional capacitance c1 3.4 ff typ. 3.7 ff to 1.6 ff 2.0 ff typ. 2.3 ff to 0.6 ff shunt capacitance c0 1.0 pf typ. 1.3 pf to 0.5 pf 1.3 pf typ. 1.7 pf to 0.9 pf frequency aging f_age ? 3 ? 10 -6 / year max. +25 ? c, first year external dimensions ( unit:mm ) . foot p rint ( recommended ) ( unit:mm ) ? khz range crystal unit low profile smd fc - 135 / fc - 255 ? frequency range : 32.768 khz (32 khz to 100 khz) ? external dimensions : 3.2 1.5 0.80 mm FC-135 : 4.9 1.8 0.80 mm fc-255 ? overtone order : fundamental ? applications : small communications devices product number (please contact us) FC-135 : q1xfc1350xxxx00 fc-255 : q1xfc2550xxxx00 1.0 1.8 2.5 3.20.1 1.50.1 0.80.1 a501j 0.75 1.7 #1 #2 FC-135 #1 #2 internal connection fc-255 4.90.1 1.80.1 0.80.1 a501j 0.85 3.2 #1 #2 #1 #2 internal connection 1.3 2.2 4.2 fc-255 FC-135 fc-255 FC-135 ? do not design any circuit patterns in the shaded area.
promotion of environm ental management system conforming to inte rnational standards at seiko epson, all environmental initiatives operate under the plan-do-check-action (pdca) cycle designed to achieve continuous improvements. the environmental management system (ems) operates under the iso 14001 environmental management standard. all of our major manufacturing and non-manufacturing sites, in japan and overseas, completed the acquisition of iso 14001 certification. working for high quality in order provide high quality a nd reliable products and services than meet customer needs, seiko epson made early efforts towards obtaining iso9000 series certification and has acquired iso9001 for all business establishments in japan and abroad. we have also acquired iso/ts 16949 certification that is requested strongly by major automotive manufacturers as standard. ? explanation of the mark that are using it for the catalog ? pb free. ? complies with eu rohs directive. *about the products without the pb-free mark. contains pb in products exempted by eu rohs directive. (contains pb in sealing glass, high melting temperature type solder or other.) ? the products have been designed for high reli ability applications such as automotive. seiko epson corporation notice ? this material is subjec t to change without notice. ? any part of this material may not be reproduced or duplicated in any form or any means without the written permission of seiko epson. ? the information about applied circuitry, software, usage, etc. wr itten in this material is intended for reference only. seiko epson does not assume any liability for the occurrence of infringing on any pat ent or copyright of a third party. this material does not a uthorize the licensing for any patent or intellectual copyrights. ? when exporting the products or technology described in this material, you should comp ly with the applicable export control law s and regulations and follow the procedures r equired by such laws and regulations. ? you are requested not to use the products (and any technical information furnished, if any) for the development and/or manufac ture of weapon of mass destruction or for other milit ary purposes. you are also requested that you would not make the products availabl e to any third party who may use the products for such prohibited purposes. ? these products are intended for general use in electronic equipment. when using them in s pecific applications that require ext remely high reliability, such as the applications stated below, y ou must obtain permission from seiko epson in advance. / space equipment (artificial satellites, rockets, etc.) / trans portation vehicles and related ( automobiles, aircraft, trains, vessels, etc.) / medical instruments to sustain life / submari ne transmitters / power stations and related / fire work equipmen t and security equipment / traffic control equipment / and others requiring equivalent reliability. ? all brands or product names mentioned herein are trademar ks and/or registered trademarks of their respective. iso 14000 is an international standard for environmental management that was established by the international standards organization in 1996 against the background of growing concern regarding global warming, destruction of the ozone layer, and global deforestation. iso/ts16949 is the international standard that added the sector-specific supplemental requirements for automotive industry based on iso9001.
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