The ECS-080-18-20BM-JEN-TR is a miniature SMD crystal oscillator designed for precision timing applications in PCM/Ethernet systems. This CSM-8M package features a seam-welded metal lid with ceramic construction, providing a compact 7.0 x 5.0 mm footprint with low profile design. The crystal operates at 8.0 MHz in fundamental mode with a frequency tolerance of ±30 ppm at +25°C and frequency stability of ±50 ppm across the -10°C to +70°C operating temperature range. Key electrical characteristics include a maximum shunt capacitance of 5 pF, load capacitance of 20 pF (series), and drive level of 100 µW, with an ESR maximum of 60 O at this frequency. The device is RoHS compliant with MSL 1 rating and gold lead finish, making it suitable for high-reliability networking and communication applications requiring stable frequency references.