E1SJA18-6.7458M TR

Crystals Overview

The E1SJA18-6.7458M TR is a surface-mount quartz crystal resonator manufactured by Ecliptek, designed for precision timing applications. Operating at a nominal frequency of 6.7458 MHz, this component utilizes an AT-cut fundamental mode of operation within the HC-49/UP short SMD package. It features a load capacitance of 18 pF and offers a tight frequency tolerance of ±15 ppm at 25°C, with stability maintained within ±30 ppm across the industrial temperature range of -40°C to +85°C. The device exhibits an aging rate of 5 ppm per year and supports a maximum drive level of 1 mW. Constructed with resistance-welded sealing, it ensures long-term reliability and RoHS compliance.

Crystals Feature Summary

• AT-cut fundamental resonance mode provides stable oscillation characteristics suitable for precise clock generation.
• Resistance-welded metal seal construction enhances environmental durability and hermetic integrity.
• Industrial-grade temperature rating (-40°C to +85°C) ensures consistent performance in demanding operational conditions.
• RoHS compliant and lead-free manufacturing process meets global environmental regulatory standards.

Crystals Applications

• Microcontroller unit (MCU) clock sources requiring stable base frequencies
• Serial communication interfaces such as UART and RS-232 transceivers
• Industrial data acquisition gateways and sensor nodes
• Consumer electronics devices needing precise timing references

Crystals Procurement Notes

Verify that the specific order suffix matches the required tape and reel packaging configuration for automated surface-mount assembly processes. Confirm that the load capacitance specification aligns with the host circuit's oscillator design requirements to prevent frequency deviation. Ensure that the operating temperature range covers the intended application environment. Check for any updated regulatory compliance certifications relevant to the destination market before finalizing procurement orders.

Crystals Selection Notes

Select this component when a fundamental mode crystal is preferred over overtone modes for frequencies below 10 MHz to maximize reliability and ease of start-up. Consider the 18 pF load capacitance requirement when designing the PCB layout and selecting external matching capacitors. Evaluate the ±15 ppm tolerance against system jitter budgets. This part is suitable for designs where space constraints favor the HC-49/UP SMD form factor over through-hole alternatives while maintaining industrial temperature resilience.

Crystals Part Context

This resonator belongs to the E1S series from Ecliptek, which specializes in standard and custom quartz crystals for commercial and industrial markets. The series is characterized by its use of resistance-welded seals and availability in various SMD packages. The E1SJA18 variant specifically denotes the HC-49/UP short footprint, offering a compact solution for high-density board layouts compared to larger traditional packages.

Crystals Replacement Considerations

Direct substitutes include other Ecliptek parts within the E1SJA18 series sharing identical electrical parameters and mechanical dimensions. Cross-manufacturer replacements must match the 6.7458 MHz frequency, 18 pF load capacitance, HC-49/UP SMD package, and ±15 ppm tolerance. Verify equivalent aging rates and drive level specifications to ensure circuit compatibility.

Crystals FAQ

What is the maximum drive level for this crystal?

The maximum drive level is 1 mWatt.

Does this component support surface-mount technology?

Yes, it is designed for surface mount installation in an HC-49/UP short package.

What is the frequency stability over the full temperature range?

The frequency stability is ±30 ppm over the temperature range of -40°C to +85°C.