HC49USM-FF5F18-25.000 MHZ

Crystals Overview

The ILSI HC49USM-FF5F18-25.000 MHZ is a surface-mount quartz crystal resonator operating at a nominal frequency of 25 MHz. It features an equivalent series resistance (ESR) of 30 Ohms and a load capacitance of 18 pF. The component exhibits frequency stability and tolerance of ±30 ppm across an operating temperature range of -40°C to +85°C. Housed in the standard HC-49/US package with dimensions of 13.3 mm x 4.7 mm, it utilizes a fundamental parallel resonance mode.

Crystals Feature Summary

• Surface-mount construction within the HC-49/US form factor
• Fundamental parallel resonance operation
• Compliant with lead-free processing standards

Crystals Applications

• Fibre channel interface circuits
• Microcontroller clock generation
• Communication module timing references

Crystals Procurement Notes

Verify the specific suffix configuration against the manufacturer's current datasheet to ensure compatibility with target circuit requirements. Confirm that the HC-49/US package dimensions align with PCB footprint constraints. Check for RoHS compliance documentation if environmental regulations apply to the final assembly process.

Crystals Selection Notes

Select this component when a 25 MHz reference signal is required in a compact surface-mount layout. The 30 Ohm ESR suits standard oscillator designs without excessive loading. Ensure the ±30 ppm stability meets system jitter specifications. Consider thermal performance within the -40°C to +85°C range for industrial environments.

Crystals Part Context

This part belongs to the HC49USM series, representing a standardized SMD variant of the traditional through-hole HC-49/U crystal. The series provides a cost-effective solution for mass-produced electronics requiring reliable frequency control in space-constrained applications.

Crystals Replacement Considerations

Cross-reference with other manufacturers offering HC-49/US 25 MHz crystals with matching 18 pF load capacitance and ±30 ppm tolerance. Verify pin compatibility and physical dimensions before substitution.