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Ecliptek is one of the ILSI America brands, which also include:

ILSI America MMD Oscilent

E1U Series Crystal
Quartz Crystal Resonator HC49/US Short Thru-Hole 2.5mm Height Metal Resistance Weld Seal

Revision  G  11/09/2015

Electrical Specifications

Nominal Frequency 3.579545MHz to 50.000MHz
Some frequencies within this range may not be available.
Frequency Tolerance (at 25°C) ±50ppm Maximum
±30ppm Maximum
±15ppm Maximum
±10ppm Maximum
Frequency Stability
(over Operating Temperature Range)
±100ppm Maximum
±50ppm Maximum
±30ppm Maximum
±20ppm Maximum
±15ppm Maximum
Operating Temperature Range 0°C to +70°C
-20°C to +70°C
-40°C to +85°C
-40°C to +105°C
-40°C to +125°C
-55°C to +125°C
Aging at 25°C ±5ppm/year Maximum
Load Capacitance 10pF to 50pF Parallel Resonant
Series Resonant
Shunt Capacitance 7pF Maximum
Equivalent Series Resistance Click to Open ESR Table
Mode of Operation Fundamental or Third Overtone
Crystal Cut AT or BT
Drive Level 1mWatt Maximum
Storage Temperature Range -55°C to +125°C
Insulation Resistance Measured at 100VDC
500 Megaohms Minimum