HC49USM-FF3F18-18.4320MHZ

Crystals Overview

The HC49USM-FF3F18-18.4320MHZ is a parallel fundamental quartz crystal resonator manufactured by ILSI America. It operates at a nominal frequency of 18.432 MHz with a frequency tolerance of ±30 ppm and a load capacitance of 18 pF. The component features an equivalent series resistance (ESR) of 40 Ohms and supports a drive level of 1 mW. Designed for surface mount applications, it utilizes the HC-49/US package format. The unit is compliant with RoHS standards and lead-free processing requirements, ensuring environmental safety.

Crystals Feature Summary

• Surface mount construction in standard HC-49/US package
• Parallel fundamental quartz crystal operation
• RoHS compliant and lead-free processing compatible

Crystals Applications

• Digital signal processor clock generation
• Microcontroller system timing
• Communication interface synchronization

Crystals Procurement Notes

Verify the specific suffix FF3F18 corresponds to the required 18pF load capacitance and ±30ppm stability when sourcing. Confirm the manufacturer datasheet for the exact operating temperature range, as variations exist between -20°C/+70°C and other ranges. Ensure the surface mount footprint matches the target PCB design specifications before finalizing procurement orders.

Crystals Selection Notes

Select this component for applications requiring a stable 18.432 MHz reference in surface mount designs. The 18pF load capacitance must match the oscillator circuit requirements to ensure accurate frequency performance. Consider the ±30ppm tolerance against system jitter budgets. Verify that the 40 Ohm ESR is within the acceptable limits of the driving circuitry.

Crystals Part Context

This part belongs to the HC49USM series of surface mount quartz crystals from ILSI America. These components are designed as drop-in replacements for traditional through-hole HC-49/U crystals while offering reduced board space consumption. The series provides various frequency options with standardized electrical parameters for common digital logic and communication applications.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US surface mount crystals with identical 18.432 MHz frequency, 18pF load capacitance, and ±30ppm tolerance. Verify mechanical dimensions and soldering profile compatibility when cross-referencing with alternative brands.