The CR139/U-Series from Wi2Wi is a Space Qualified Crystal with Frequency Range 20 to 22 MHz, Equivalent Series Resistance 40 Ohms, Shunt Capacitance 12 pF, Load Capacitance 30 pF, Operating Temperature Range -55 to 105 Degree C. Tags: Through Hole. More details for CR139/U-Series can be seen below.