The Q33310F700017 SG-310SCF 20 MHZ C is a 3.2 x 2.5 x 1.05mm 3.3V Crystal Oscillator with standby (ST) function. The SPXO standard SG-310SCF series oscillator with no load condition and to maintain stable operation, provide a by-pass capacitor at a location as near as possible to the power source terminal of the crystal product.