The BC27 Series from Bomar Crystal is a RF Quartz Crystal with Frequency 7 to 200 MHz, Frequency Stability ±10ppm to ±50ppm, Frequency Tolerance ±30ppm(Standard), ±10ppm to ±50ppm(Available), Drive Power Level 300 µW, Load Capacitance 8 to 100 pF. Tags: Surface Mount. More details for BC27 Series can be seen below.