E1SJA18-12.000M TR

Crystals Overview

The E1SJA18-12.000M TR is a surface-mount quartz crystal resonator from the Ecliptek E1S series, operating at a nominal frequency of 12 MHz. It utilizes an AT-cut fundamental mode of operation within a short HC-49/UP SMD package measuring 13.3 mm in length, 4.85 mm in width, and 3.2 mm in maximum height. The component features a load capacitance of 18 pF and offers a frequency tolerance of ±15 ppm at 25°C, with stability maintained within ±30 ppm across the -40°C to +85°C operating temperature range. Key electrical specifications include a maximum shunt capacitance of 7 pF, a maximum equivalent series resistance (ESR) of 70 Ohms, and a maximum drive level of 1 mW. The unit exhibits an aging rate of ±5 ppm per year and supports a storage temperature range from -55°C to +125°C.

Crystals Feature Summary

• AT-cut fundamental resonance mode for stable oscillation without harmonic filtering requirements
• Resistance-welded metal seal construction ensuring mechanical durability and environmental protection
• Short HC-49/UP surface mount form factor designed for compact PCB integration

Crystals Applications

• Microcontroller oscillator circuits requiring precise clock timing
• Communication interfaces utilizing standard baud rates derived from 12 MHz bases
• Industrial control systems operating within extended temperature ranges

Crystals Procurement Notes

Verify compliance with RoHS 2011/65/EU and REACH regulations prior to procurement, as the component is certified lead-free. Confirm that the specific tape and reel packaging aligns with automated assembly equipment capabilities. Ensure that the supplier provides valid certificates of conformity for environmental standards to facilitate regulatory audits during product certification processes.

Crystals Selection Notes

Select this component when a 12 MHz reference signal is required for parallel resonant circuits with a 18 pF load capacitance. The ±15 ppm initial tolerance and ±30 ppm total stability over temperature make it suitable for applications where moderate frequency accuracy is sufficient. Consider the 70 Ohm maximum ESR to ensure compatibility with the driving circuit's output impedance and verify that the 1 mW drive level does not exceed the source capability.

Crystals Part Context

This part belongs to the Ecliptek E1S series of surface-mount crystals, which are characterized by their short HC-49/UP footprint. The series is designed to replace traditional through-hole HC-49/U components in space-constrained designs while maintaining similar electrical performance profiles. The 'TR' suffix indicates the component is supplied in tape and reel packaging for high-volume manufacturing efficiency.

Crystals Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout compatibility and physical dimensions against existing footprints if considering alternative manufacturers. Ensure that any replacement maintains the 18 pF load capacitance requirement to prevent frequency deviation.