The ECS-080-20-4X-DU is a low-profile resistance weld type through-hole quartz crystal based on the HC-49USX package, designed for cost-effective timing applications. It operates across a frequency range of 3.57 to 70 MHz with fundamental mode operation up to 30 MHz and 3rd overtone mode from 27 to 70 MHz, featuring a maximum equivalent series resistance (ESR) of 30 O in the 20–30 MHz range. The crystal exhibits a frequency tolerance of ±30 ppm at +25°C and frequency stability of ±50 ppm over the operating temperature range of -10 to +70°C, with a shunt capacitance of 7 pF and load capacitance of 20 pF. With a maximum drive level of 500 µW, storage temperature range of -55 to +125°C, and first-year aging of ±5 ppm, this RoHS-compliant component is ideal for consumer electronics, telecommunications, and industrial timing circuits requiring reliable frequency control.