Crystal unit Epson Toyocom Product Number (please contact us) FC-145 : Q13FC1450xxxx00 FC-255 : Q1xFC2550xxxx00 kHz RANGE CRYSTAL UNIT LOW PROFILE SMD FC - 145 / FC - 255 Frequency range : External dimensions : : Overtone order : Applications : 32.768 kHz (32 kHz to 100 kHz) 4.1 x 1.5 x 0.8 t (mm) ***FC-145 4.9 x 1.8 x 0.8 t (mm) ***FC-255 Fundamental Small communications devices Actual size FC-145 FC-255 Specifications (characteristics) Item Symbol Nominal frequency range f_nom Storage temperature Operating temperature Temperature range Remarks FC-255 32.768 kHz 32 kHz to 100 kHz T_stg -55 C to +125 C T_use -40 C to +85 C DL 0.5 W Max. Frequency tolerance (standard) f_tol 20 10-6 Turnover temperature Ti +25 C 5 C Parabolic coefficient B -0.04 10-6 / C2 Max. Level of drive +25 C, DL=0.1 W Please ask for tighter tolerance CL 7 pF,9 pF,12.5 pF 7 pF, 12.5 pF 7 pF, 12.5 pF Motional resistance (ESR) R1 70 k Max. 65 k Max. 70 k to 30 k Motional capacitance C1 3.4 fF Typ. 2.0 fF Typ. 2.3 fF to 0.6 fF Shunt capacitance C0 1.0 pF Typ. 1.3 pF Typ. 1.7 pF to 0.9 pF Please specify 3 10-6 / year Max. f_age Please contact us for inquiries regarding available frequencies. Store as bare product after unpacking Load capacitance Frequency aging +25 C, First year External dimensions (Unit:mm) FC-145 A501J 1.80.1 1.50.1 FC-255 A501J 4.10.1 2.3 0.80.1 4.90.1 0.80.1 3.2 #2 #1 Internal connection (TOP VIEW) Internal connection (TOP VIEW) #2 #1 #1 #1 #2 #2 0.9 0.85 Footprint (Recommended) (Unit:mm) 1.1 FC-145 1.3 FC-255 3.2 2.2 1.8 . Specifications FC-255 FC-145 4.2 Do not design any patterns on shaded area. http://www.epsontoyocom.co.jp