SMALL SMD LOW / MEDIUM-FREQUENCY CRYSTAL UNIT MC-306 * * * * High-density mounting-type SMD. Photolithography finished allows uniform and stable performance. Excellent reliability and environmental capability. 2.54mm thickness is equal to SMD-type IC. Actual size Specifications (characteristics) Item Symbol f Nominal frequency Storage temperature Operating temperature Temperature range 32.768 kHz 20.000 kHz to 165.000 kHz TSTG -55C to +125C TOPR -40C to +85C Stored as bare product after unpacking 1.0W max. GL Maximum drive level Remarks Specifications Twice at under 260C within 10 sec. Soldering condition TSOL Frequency tolerance (standard) f/f Peak temperature (frequency) T 25C 5C Temperature coefficient (frequency) a -0.04ppm/ C2 max. Load capacitance CL or under 230C within 3 min. 20ppm, 50ppm 6pF to Please specify Series resistance R1 Motional capacitance C1 1.8fF typ. 4.0fF to 0.6fF Shunt capacitance C0 0.9pF typ. 2.0pF to 0.6pF Insulation resistance IR Aging fa Shock resistance Ta=25C, DL=0.1W 50ppm, 100ppm 50 k max. 55 k to 10 k As per below table 500 M min. 3ppm/Y max. 5ppm/Y max. Ta=25C 3C, first year Three drops on a hard board from 75 cm or excitation 5ppm max. S.R. test with 3000G x 0.3ms x 1/2 sine wave x 3 directions There are some cases that a parts of the cylindrical capsule of quartz unit expose on the surface of the molding material. Series resistance Frequency (kHz) 20 f < 30 30 f < 40 40 f < 60 60 f < 70 70 f < 120 120 f < 165 Series resonance resistance () 55K max. 45K max. 20K max. 15K max. 12K max. 10K max. External dimensions (Unit: mm) #3 #1 #2 1.3 4.2 1.3 1.9 3.2 32.768k E 571 #4 3.8 max. #3 #2 1.9 2.38 2.54 max. 1.3 #1 (Unit: mm) Internal connection 8.0 max. #4 Recommended soldering pattern 0.5 1.9 5.5 (0.9) (0.9) Do not connect #2 and #3 to external device. http://www.spezial.cz - - - spezial@spezial.cz - - - Hotlines: Tel (02) 2434 2200 - - - Fax (02) 2434 3200