HC49USM-FF5F18-18.432 MHZ

Crystals Overview

The ILSI HC49USM-FF5F18-18.432 MHZ is a fundamental mode quartz crystal resonator designed for surface-mount applications. It operates at a nominal frequency of 18.432 MHz with a load capacitance of 18 pF and an equivalent series resistance (ESR) of 40 Ohms. The component provides a frequency stability and tolerance of ±30 ppm, ensuring reliable timing performance across a wide operating temperature range of -40°C to +85°C. Housed in the standard HC-49/US package measuring 13.3 mm x 4.73 mm x 4.50 mm, this device supports lead-free processing and RoHS compliance.

Crystals Feature Summary

• Fundamental parallel resonance operation utilizing AT-cut quartz technology
• Surface-mount construction within the standardized HC-49/US package
• Compliant with lead-free manufacturing processes and RoHS standards

Crystals Applications

• Fibre channel interface circuits
• Microcontroller clock generation
• Serial communication baud rate synthesis

Crystals Procurement Notes

Verify the specific suffix FF5F18 against official ILSI documentation to confirm the exact load capacitance and ESR specifications. Ensure the procurement source provides valid RoHS compliance certificates and material declarations. Cross-reference the part number with the manufacturer's current datasheet to confirm availability of technical drawings and reliability test reports before finalizing orders.

Crystals Selection Notes

Select this component when a stable 18.432 MHz reference is required for surface-mount designs. The ±30 ppm tolerance suits general digital logic and communication interfaces. Consider the 40 Ohm ESR value for oscillator circuit compatibility. Verify that the application environment remains within the specified -40°C to +85°C operational range to maintain frequency accuracy.

Crystals Part Context

This part belongs to the HC49USM series by ILSI America, which offers various fundamental mode crystals in the HC-49/US form factor. The series covers multiple frequencies including 10 MHz, 14.7456 MHz, and 27 MHz, all sharing similar physical dimensions and mounting characteristics. These components are widely used in consumer electronics and industrial control systems requiring precise timing signals.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US crystals with identical 18.432 MHz frequency, 18 pF load capacitance, and ±30 ppm stability. Ensure replacement parts match the 40 Ohm ESR specification and physical footprint. Verify that alternative sources also support lead-free soldering processes.