The X1G0036210074 SG-211SCE 50 MHZ H is a 2.5 x 2 x 0.7mm 3.3V 20ppm Crystal Oscillator with standby (ST) functions. The SPXO standard SG-211SCE 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.