HC49USM-FF3F18-25.000MHZ

Crystals Overview

The ILSI HC49USM-FF3F18-25.000MHZ is a surface-mount quartz crystal resonator operating at a nominal frequency of 25 MHz. It features a ±30 ppm frequency tolerance and stability, with an equivalent series resistance (ESR) of 30 Ohms. The component utilizes a standard load capacitance of 18 pF and operates in the fundamental mode. Designed for reliability across industrial environments, it supports a temperature range from -40°C to +85°C. The physical dimensions are 13.3 mm in length, 4.7 mm in width, and 4.5 mm in maximum height, housed in an HC-49/US package.

Crystals Feature Summary

• Surface-mount design compatible with automated assembly processes
• Fundamental mode operation ensuring stable frequency generation
• Industrial-grade thermal performance for wide temperature ranges

Crystals Applications

• Microcontroller clock circuits
• Communication interface modules
• Digital signal processing systems

Crystals Procurement Notes

Verify that the specific suffix FF3F18 matches the required load capacitance and ESR specifications for the target circuit design. Confirm the HC-49/US package dimensions align with the PCB footprint constraints. Ensure the ±30 ppm tolerance meets the system timing requirements. Check for RoHS compliance status if environmental regulations apply to the final product assembly.

Crystals Selection Notes

Select this component when a 25 MHz reference signal is required in a compact surface-mount form factor. The 18 pF load capacitance must match the oscillator circuit's external capacitors to ensure accurate frequency output. Consider the 30 Ohm ESR limit to guarantee reliable startup conditions within the host application's oscillator topology.

Crystals Part Context

This part belongs to the HC49USM series of quartz crystals manufactured by ILSI America. The series provides various frequency options in a standardized SMD package, balancing cost-effectiveness with performance. It serves as a passive frequency control element for electronic systems requiring precise timing references without active oscillation capabilities.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US packages with identical 25 MHz frequency, 18 pF load capacitance, and ±30 ppm tolerance. Verify pin compatibility and mechanical footprint before substitution.