E1SJA18-18.000M TR

Crystals Overview

The E1SJA18-18.000M TR is a quartz crystal resonator manufactured by Ecliptek, operating at a nominal frequency of 18 MHz. It utilizes an AT-cut fundamental mode and features a parallel resonance configuration with a load capacitance of 18 pF. The component is housed in a surface-mount SMD package with two pins, specifically designed as a short HC-49/UP variant. Electrical specifications include a maximum equivalent series resistance of 50 ohms and a drive level limit of 1 mWatt. Frequency tolerance is ±15 ppm at 25°C, extending to ±30 ppm over the operating temperature range of -40°C to +85°C. Aging is rated at a maximum of 5 ppm per year.

Crystals Feature Summary

• AT-cut fundamental mode operation for stable parallel resonance
• Resistance welded metal seal construction ensuring environmental integrity
• Surface mount design compatible with automated assembly processes
• RoHS compliant lead-free termination meeting regulatory standards

Crystals Applications

• Clock signal generation for microcontroller systems
• Timing reference for communication interface circuits
• Frequency control in consumer electronic devices
• Oscillator circuits requiring precise fundamental frequency stability

Crystals Procurement Notes

Verify that the specific ordering suffix matches the required tape and reel packaging format. Confirm compliance with RoHS directives and REACH regulations prior to integration. Ensure the selected variant aligns with the target application's thermal requirements and mechanical footprint constraints. Cross-reference manufacturer documentation for any updates regarding material composition or manufacturing location changes.

Crystals Selection Notes

Select this component when a fundamental mode crystal is required for 18 MHz applications. The 18 pF load capacitance dictates the external capacitor values needed for circuit oscillation. Verify that the driving circuitry adheres to the 1 mWatt maximum drive level to prevent frequency drift or damage. Consider the ±30 ppm total stability over the full temperature range for timing accuracy requirements.

Crystals Part Context

This part belongs to the E1S Series of quartz crystal resonators from Ecliptek. It represents a surface-mount adaptation of traditional through-hole HC-49/UP crystals, offering reduced board space consumption while maintaining similar electrical performance characteristics. The series is designed for general-purpose timing applications where moderate stability and cost-effectiveness are prioritized.

Crystals Replacement Considerations

Direct substitutes within the same series include E1SJA18-12.000MTR and E1SJA18-20.000M TR, which share identical physical dimensions and mounting characteristics but differ in nominal frequency.