The X1G0041710047 SG-210STF 50 MHZ L is a 2.5 x 2 x 0.8mm 2.5V 50ppm Crystal Oscillator with standby (ST) functions. The SPXO standard SG-210STF 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.