HC49USM-FF5F18-20.000MHZ

Crystals Overview

The ILSI HC49USM-FF5F18-20.000MHZ is a surface-mount quartz crystal oscillator operating at a nominal frequency of 20 MHz. It features a frequency tolerance and stability of ±30 ppm, with a load capacitance of 18 pF. The component utilizes an HC-49/US package, measuring 11.40 mm in length, 4.73 mm in width, and 4.50 mm in maximum height. It exhibits an equivalent series resistance (ESR) of 30 Ohms and supports fundamental mode operation across a temperature range of -40°C to +85°C.

Crystals Feature Summary

• SMD Package Compatible with Leadfree Processing
• Grounded package for low EMI

Crystals Applications

• Fibre Channel Server & Storage
• Sonet /SDH
• 802.11 / Wifi
• T1/E1, T3/E3 System Clock

Crystals Procurement Notes

Verify the specific suffix FF5F18 against official ILSI documentation to confirm exact electrical parameters such as ESR and load capacitance. Ensure the HC-49/US footprint matches the target PCB design. Confirm RoHS compliance status and lead-free processing compatibility prior to integration into manufacturing workflows.

Crystals Selection Notes

Select this component for applications requiring precise timing in high-speed digital interfaces. The grounded metal package provides effective electromagnetic interference shielding. Verify that the 18 pF load capacitance aligns with the host circuit's oscillator requirements to ensure accurate frequency generation within the specified tolerance.

Crystals Part Context

This part belongs to the HC49USM series by ILSI America, designed for surface-mount technology. It replaces traditional through-hole crystals in modern compact electronics. The series supports frequencies ranging from 3.2 MHz to 100 MHz, offering standardized dimensions for automated assembly processes.

Crystals Replacement Considerations

Cross-reference with HC49USM-FF5F18-20.000MHZ variants from other manufacturers ensuring identical HC-49/US dimensions and 18 pF load capacitance.