HC49USM-FF5F18-12.000 MHZ

Crystals Overview

The HC49USM-FF5F18-12.000 MHZ is a surface-mount quartz crystal manufactured by ILSI, designed for precision timing applications. It operates at a nominal frequency of 12.000 MHz with a load capacitance of 18 pF. The component features a frequency tolerance and stability of ±30 ppm across an operating temperature range of -40°C to +85°C. Housed in an HC-49/US package measuring 13.3 mm x 11.4 mm x 4.5 mm, it supports fundamental mode operation and is compatible with lead-free processing standards.

Crystals Feature Summary

• Surface mount design compatible with automated assembly processes
• Grounded package construction for low electromagnetic interference
• Compliant with RoHS and lead-free manufacturing requirements

Crystals Applications

• Fibre Channel server and storage systems
• SONET/SDH network infrastructure
• IEEE 802.11 Wi-Fi communication modules
• T1/E1 and T3/E3 system clocking

Crystals Procurement Notes

Verify the specific suffix FF5F18 against official ILSI documentation to confirm exact load capacitance and tolerance specifications. Ensure the procurement channel provides valid manufacturer traceability. Confirm that the delivered units match the HC-49/US SMD form factor and meet the required environmental ratings for the intended application environment.

Crystals Selection Notes

Select this component when a 12 MHz reference signal is required for high-speed digital interfaces. The ±30 ppm stability suits general-purpose data transmission where tight phase noise is not critical. The SMD package facilitates compact PCB layouts compared to through-hole alternatives. Verify compatibility with the target oscillator circuit's drive level requirements.

Crystals Part Context

This part belongs to the HC49USM series, which includes various frequencies and packages. It shares the physical dimensions and mounting style with other variants in the family but differs in electrical characteristics such as frequency and ESR. The series is widely used in telecommunications and computing equipment requiring stable clock sources.

Crystals Replacement Considerations

Direct substitutes include other HC49USM-FF5F18-12.000MHZ units from ILSI or equivalent crystals from manufacturers like TXC or ECS, provided they match the 18pF load capacitance and ±30ppm tolerance. Cross-referencing datasheets for pin compatibility and thermal performance is essential.