E1SCA18-20.000M TR

Crystals Overview

The E1SCA18-20.000M TR is a surface-mount quartz crystal resonator operating at a nominal frequency of 20.000 MHz. It utilizes an AT-cut fundamental parallel resonant mode with a load capacitance of 18 pF. The component features a resistance-welded metal seal within an HC-49/US short package, measuring 13.3 mm in length and 4.85 mm in width. It exhibits a frequency tolerance of ±50 ppm at 25°C and stability of ±100 ppm over the -40°C to +85°C operating range. Aging is specified at a maximum of 5 ppm per year, with an equivalent series resistance of 50 ohms maximum.

Crystals Feature Summary

• AT-cut fundamental parallel resonant operation for stable frequency generation
• Resistance-welded metal seal construction ensuring environmental durability
• Surface-mount design compatible with automated assembly processes

Crystals Applications

• Clock signal generation for microprocessors and microcontrollers
• Timing references in communication equipment
• Frequency control in consumer electronics devices

Crystals Procurement Notes

Verify that the specific part number includes the TR suffix to confirm tape-and-reel packaging, as bulk variants exist within the same family. Ensure the receiving facility is equipped to handle surface-mount components according to standard reflow soldering profiles. Confirm RoHS compliance documentation matches the manufacturing batch requirements for your assembly line.

Crystals Selection Notes

Select this component when a 20 MHz surface-mount crystal with ±50 ppm initial tolerance is required. The HC-49/US short form factor suits applications needing compact footprints without sacrificing the robustness of a welded seal. Consider the 18 pF load capacitance requirement to ensure proper oscillator circuit matching.

Crystals Part Context

This part belongs to the E1S series of surface-mount crystals from Ecliptek. The series offers various frequencies and tolerances in standardized packages. The HC-49/US short variant provides a balance between size reduction and performance reliability compared to larger through-hole alternatives.

Crystals Replacement Considerations

Direct substitutes must match the 20.000 MHz frequency, 18 pF load capacitance, and HC-49/US short package dimensions. Verify that alternative sources offer comparable aging rates and drive level specifications to maintain system timing integrity.