The BC63 Series from Bomar Crystal is a RF Quartz Crystal with Frequency 26 to 54 MHz, Frequency Stability ±10ppm to ±50ppm, Frequency Tolerance ±30ppm(Standard), ±10ppm to ±50ppm(Available), Drive Power Level 10 µW, Load Capacitance 8 to 100 pF. Tags: Surface Mount. More details for BC63 Series can be seen below.