E1SJA18-4.500M TR

Crystals Overview

The E1SJA18-4.500M TR is a surface-mount quartz crystal resonator operating at a nominal frequency of 4.5 MHz. It features an HC-49/US package with two pins and utilizes resistance welding for sealing. The component supports parallel fundamental mode operation with a load capacitance of 18 pF. Frequency tolerance is specified at ±15 ppm at 25°C, extending to ±30 ppm across the industrial temperature range of -40°C to +85°C. Aging stability is rated at 5 ppm per year maximum. The device complies with RoHS standards and is lead-free.

Crystals Feature Summary

• Surface mount construction with resistance welded metal seal
• AT-cut fundamental mode operation for stable oscillation
• Industrial temperature range support from -40°C to +85°C
• RoHS compliant and lead-free manufacturing process

Crystals Applications

• General purpose clock generation in microcontroller systems
• Timing references for communication interface circuits
• Industrial control board oscillator modules
• Consumer electronics timing applications

Crystals Procurement Notes

Verify the specific frequency tolerance requirements against the datasheet specifications for both 25°C and full temperature range conditions. Confirm that the 18 pF load capacitance matches the target circuit design. Ensure the SMD package dimensions align with the PCB footprint. Check for RoHS compliance documentation if required by project regulations. Validate the aging rate specification against long-term stability needs.

Crystals Selection Notes

Select this component when a 4.5 MHz reference is required for surface-mount assembly. The HC-49/US form factor allows for easy integration into standard layouts. Consider the ±15 ppm initial tolerance and ±30 ppm total stability over temperature for system accuracy. The 18 pF load capacitance dictates external capacitor values. Verify drive level limits to prevent over-driving the crystal in the oscillator circuit.

Crystals Part Context

This part belongs to the E1S series of short HC-49/UP crystals manufactured by Ecliptek. The series focuses on providing reliable timing solutions in compact surface-mount packages. These components are designed for high-volume production environments requiring consistent performance. The E1S designation indicates specific manufacturing processes and quality controls associated with this product line.

Crystals Replacement Considerations

Direct substitutes must match the 4.5 MHz frequency, 18 pF load capacitance, and HC-49/US package size. Verify equivalent frequency tolerance and temperature range specifications. Cross-reference electrical parameters such as ESR and shunt capacitance if critical for the oscillator design. Ensure compatibility with existing PCB footprints and reflow soldering profiles.