TUNING FORK CRYSTAL UNIT (SMD • Ceramic Package) CM519 RoHS compliant / Pb free 3000pcs/reel ■ FEATURES 7Tuning fork crystal with ceramic packaged type. 7Small & thin packaging and light weight. 7Most appropriate for portable devices and mobile telecommunications devices. Life-size ■ DIMENSION [mm] ■ SOLDER PAD LAYOUT [mm] 1.8±0.15 4.9±0.15 4-R0.15 2.9 1.3 2.2 1.0 Max. 1.3 0.1 3.2 Internal connection 1.6 0.53 （3.95） 0.75 0.1 Do not design any patterns on shaded area. ■ STANDARD SPECIFICATIONS Item Model CM519 Conditions f0 32.768kHz △ f/f0 ±20ppm at 25˚C CL 9.0pF, 12.5pF Need to specify your requirement Operating Temperature Range TOPR −40℃∼＋85℃ Storage Temperature Range TSTR −55℃∼＋125℃ Turnover Temperature TM 25℃±5℃ Temperature Coefficient β −0.034±0.006ppm/℃2 Motional (series) resistance R1 70KΩMax. Level of drive DL 1μW Max. △ f/f0 ±3ppm Max. C0 1.35pF Typ. Nominal Frequency Frequency Tolerance Load capacitance Aging (first year) Shunt capacitance http://cfm.citizen.co.jp/english/product/pr02.html at 25˚C 25℃±3℃