High-stability, time keep clock signal, small package suitable for small telecommunication equipment Excellent environmental capability SPK type: Frequency range: SPK206: Fundamental mode: 20.0 to 27MHz SPK309: Fundamental mode: 4.0 to 30MHz 3rd overtone mode: 31.0 to 70.0MHz SPK310: Fundamental mode: 3.5 to 6MHz Crystal cut: At-cut or 3rd At-cut Load capacitance: series or 10 to 32pF Calibration tolerance (at 25 degrees Celsius): +/- 20, +/- 30 or +/- 50ppm Frequency stability: +/- 20, +/- 30 or +/-50ppm Operating temperature range: -10 to + 60 degrees Celsius Shunt capacitance: 7pF maximum Aging (per year at +25 degrees Celsius): +/- 5 ppm Drive level: 0.3mW maximum Shock resistance: drops onto a hard wood board from the height of 75cm Insulation resistance: 500M Ohms minimum SPK-309/310: 3.5 to 6MHz: 150 Ohms 6.0 to 10MHz: 100 Ohms 10 to 19.99MHz: 50 Ohms 20 to 33.99MHz: 40 Ohms 34 to 70MHz: 100 Ohms SPK-206: 20 to 33.99MHz: 80 Ohms