E1SJA18-20.000M TR

Crystals Overview

The E1SJA18-20.000M TR is a surface-mount quartz crystal resonator manufactured by Ecliptek, designed for precision timing applications. It operates at a nominal frequency of 20.000 MHz with a parallel resonant mode using AT-cut fundamental vibration. The component features a frequency tolerance of ±15 ppm at 25°C and ±30 ppm over the operating temperature range of -40°C to +85°C. Aging is specified at a maximum of ±5 ppm per year. Key electrical parameters include a load capacitance of 18 pF, a maximum equivalent series resistance (ESR) of 50 Ohms, and a maximum drive level of 1 mWatt. The package is an HC-49/UP short form factor with two pads.

Crystals Feature Summary

• AT-cut fundamental mode operation ensures stable frequency generation without spurious responses.
• Resistance weld seal construction provides environmental protection and mechanical durability.
• RoHS compliant manufacturing process supports lead-free assembly requirements.

Crystals Applications

• Microcontroller clock sources
• Communication interface circuits
• Digital signal processing systems

Crystals Procurement Notes

Verify that the ordering suffix matches the required tape and reel packaging configuration. Confirm compliance with RoHS 2011/65/EU and REACH SVHC regulations prior to integration. Ensure the selected variant aligns with the specific thermal and electrical specifications required for the target application environment.

Crystals Selection Notes

Select this component when a 20 MHz reference is required in a compact surface-mount footprint. The 18 pF load capacitance dictates the external capacitor values needed for circuit oscillation. Verify that the system's drive level remains below 1 mWatt to prevent frequency instability or crystal damage during operation.

Crystals Part Context

This part belongs to the E1S series of small-volume quartz crystals from Ecliptek. The series utilizes the HC-49/UP short package design, offering a reduced profile compared to standard through-hole variants while maintaining similar electrical performance characteristics for general-purpose timing needs.

Crystals Replacement Considerations

Direct substitutes must match the 20 MHz frequency, 18 pF load capacitance, and HC-49/UP SMD package dimensions. Verify that alternative components meet the same ±15 ppm tolerance and -40°C to +85°C operating temperature range specifications.