E1SJA18-13.500M TR

Crystals Overview

The E1SJA18-13.500M TR is a surface-mount quartz crystal resonator from the Ecliptek E1S series, operating at a nominal frequency of 13.5 MHz. It utilizes an AT-cut fundamental parallel resonant mode with a load capacitance of 18 pF. The component features resistance-welded sealing within a short HC-49/UP SMD package measuring 13.3 mm x 4.85 mm x 3.2 mm. Electrical specifications include a frequency tolerance of ±15 ppm at 25°C and ±30 ppm over the -40°C to +85°C operating range, with aging limited to 5 ppm/year maximum.

Crystals Feature Summary

• Surface-mount construction using short HC-49/UP package geometry for compact circuit integration
• Resistance-welded metal seal providing environmental protection for the internal quartz element
• AT-cut fundamental mode operation ensuring stable parallel resonance characteristics

Crystals Applications

• Clock signal generation in microcontroller-based embedded systems
• Timing references for serial communication interfaces such as UART and SPI
• Frequency standards for digital logic circuits requiring precise clock synchronization

Crystals Procurement Notes

Verify that the specific ordering suffix matches the required tape and reel packaging configuration rather than cut tape. Confirm RoHS compliance status aligns with current regulatory requirements for the target assembly process. Ensure the load capacitance specification matches the oscillator circuit design parameters to maintain frequency accuracy.

Crystals Selection Notes

Select this component when a standard 13.5 MHz reference is required for surface-mount assembly processes. The 18 pF load capacitance must be compatible with the host oscillator circuit's input capacitance. Consider the ±30 ppm stability requirement across the full industrial temperature range during system design validation.

Crystals Part Context

This part belongs to the Ecliptek E1S series of short HC-49/UP surface-mount crystals. The series offers various frequency options while maintaining consistent physical dimensions and electrical performance profiles. These components are designed to replace traditional through-hole HC-49/US units in modern PCB layouts.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' short HC-49/UP SMD crystals with identical 13.5 MHz frequency, 18 pF load capacitance, and ±15 ppm tolerance. Verify mechanical footprint compatibility and equivalent aging rates before implementation.