The XTAL51UCK-1.4MHz-A from Dynamic Engineers is a RF Quartz Crystal with Frequency 1.4 MHz, Frequency Tolerance ±15 ppm, Shunt Capacitance 7 pF, Equivalent Series Resistance 450 Ohms, Operating Temperature -20 to 70 Degree C. Tags: Thru Hole. More details for XTAL51UCK-1.4MHz-A can be seen below.