E1SJA18-24.576M TR

Crystals Overview

The E1SJA18-24.576M TR is a surface-mount quartz crystal resonator manufactured by Ecliptek, designed for precision timing applications. It operates at a nominal frequency of 24.576 MHz with a fundamental parallel resonance mode. The component features an equivalent series resistance (ESR) of 40 Ohms maximum and supports a load capacitance of 18 pF. Frequency tolerance is specified at ±15 ppm at 25°C, extending to ±30 ppm across the operating temperature range of -40°C to +85°C. Packaged in an HC-49/US SMD form factor measuring 11.60mm x 4.85mm x 3.20mm, it utilizes resistance welding technology and complies with RoHS3 standards.

Crystals Feature Summary

• Surface-mount construction utilizing HC-49/US package geometry for automated assembly compatibility
• AT-cut fundamental mode operation ensuring stable frequency generation over wide temperature ranges
• Resistance welded internal structure providing robust mechanical integrity and leak-tight performance
• Compliance with RoHS3 environmental regulations for lead-free manufacturing processes

Crystals Applications

• High-speed serial communication interfaces requiring precise clock synchronization
• Microcontroller and microprocessor system clock sources
• Digital signal processing circuits demanding low phase noise
• Consumer electronics with strict size constraints for timing components

Crystals Procurement Notes

Verify that the ordering suffix corresponds to tape-and-reel packaging when high-volume automated placement is required. Confirm that the specific variant matches the required load capacitance and frequency stability specifications for the target application environment. Ensure compliance with RoHS3 directives if restricted substances are prohibited in the final product assembly process.

Crystals Selection Notes

Select this component when a standard HC-49/US footprint is available on the PCB layout but through-hole mounting is undesirable. Consider the 18 pF load capacitance requirement to ensure circuit matching without additional external capacitors. Evaluate the ±30 ppm total stability over temperature against system jitter requirements to determine suitability for high-speed data transmission protocols.

Crystals Part Context

This part belongs to the E1S series of quartz crystals from Ecliptek, characterized by surface-mount availability and resistance-welded construction. It serves as a direct replacement for legacy through-hole HC-49/U crystals where space optimization is necessary. The series maintains consistent electrical parameters while adapting the physical package for modern SMT production lines.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US SMD crystals with identical 24.576 MHz frequency, 18 pF load capacitance, and ±15 ppm initial tolerance. Verify that alternative parts meet the same 40 Ohm ESR limit and operate within the -40°C to +85°C range to maintain system timing integrity.