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we are a manufactor for quartz crystal resonator in China .we have got 7 patent ceritificate . we have past CE certificate &ISO certificate.so we have realible quality & reasonable price . we warmly welcome you visit our company and cooperation with us. Quartz crystal resonator has the advantage of small calibration tolerance, tight temperature frequency deviation and is widely used in mobile communications, kind of telephones, computers and facsimiles. Features: Resistance welding , Low power, High stability, Wide frequency range Nominal frequency: 1.**0~**5.**0MHz Mode of vibration: Fundament 1.0~*0.0MHz, 3rd Overtone *4.0~*0.0MHz, *0.0~**5.0MHz Frequency tolerance: +/**0ppm, +/**0ppm, +/**0ppm Frequency stability: +/**0ppm, +/**0ppm, +/**0ppm Load capacitance: 8pf~*3pf, series Shunt capacitance: 7.0pf max Drive level: 0.*1~2.0mw max Insulation resistance: **0MΩMin/**0+/**5VDC Operating temperature : A)**0~**0 B)**0~**0 C)**0~**0 D)**0~**5 Aging: ≤5ppm/ year Special specifications are available as customer