HC49US-FF5F18-18.4320MHZ

Crystals Overview

The ILSI HC49US-FF5F18-18.4320MHZ is a parallel fundamental quartz crystal operating at a nominal frequency of 18.432 MHz. It features a frequency tolerance and stability of ±30 ppm and a load capacitance of 18 pF. The component utilizes an AT-cut resonator with a maximum equivalent series resistance (ESR) of 30 Ohms and a drive level of 1 mW. Designed for through-hole mounting, it adheres to the HC-49/US package dimensions of approximately 11.4 mm in length, 4.7 mm in width, and 4.5 mm in height. The unit supports a standard operating temperature range from -40°C to +85°C.

Crystals Feature Summary

• AT-cut quartz resonator technology for stable oscillation
• Through-hole compatible HC-49/US metal package design
• Compliant with lead-free processing standards

Crystals Applications

• Microcontroller clock generation circuits
• Communication interface timing references
• General-purpose oscillator circuits

Crystals Procurement Notes

Verify current manufacturing status as this specific part number may be obsolete or discontinued by the manufacturer. Confirm availability of authorized distributors for genuine units. Ensure compatibility with existing PCB footprints and reflow profiles if applicable. Check for updated substitute part numbers from ILSI America before finalizing procurement plans.

Crystals Selection Notes

Select this component when a 18.432 MHz reference signal is required for digital systems. The ±30 ppm tolerance suits most general applications. Verify that the circuit drive level remains within the specified 1 mW limit to prevent frequency drift or damage. Ensure the load capacitance matches the system requirements for accurate frequency operation.

Crystals Part Context

This crystal belongs to the HC49US series produced by ILSI America. The series offers various frequencies within the HC-49/US form factor. These components are widely used in consumer electronics and industrial equipment requiring precise timing. The model suffix indicates specific electrical parameters including load capacitance and tolerance levels.

Crystals Replacement Considerations

Public records indicate this product is no longer manufactured. View substitutes provided by the manufacturer or distributors. Ensure replacement parts match the 18.432 MHz frequency, 18 pF load capacitance, and HC-49/US package dimensions.