Low Profile Long term stability Industry standard footprint Extended Temp. Range ECX-306 SMD TUNING FORK CRYSTAL The ECX-306 is a compact SMD Tuning Fork Crystal. The 3.8 x 8.0 x 2.5 mm package is ideal for today's SMD manufacturing environment. OPERATING CONDITIONS / ELECTRICAL CHARACTERISTICS PARAMETERS CONDITIONS Frequency Frequency Tolerance Load Capacitance Drive Level Equivalent Series Resistance Turnover Temperature Temperature Coefficient Shunt Capacitance First Year Aging Operating.