HC49USM-FF3F18-4.000MHZ

Crystals Overview

The ILSI HC49USM-FF3F18-4.000MHZ is a surface-mount quartz crystal operating at a nominal frequency of 4 MHz. It utilizes the HC-49/US package with dimensions of 11.40mm x 4.73mm and a maximum height of 4.50mm. The component features a load capacitance of 18 pF, a frequency tolerance of ±30 ppm, and an equivalent series resistance (ESR) of 150 Ohms. It supports a drive level of 1 mW and operates within a temperature range of -40°C to +85°C.

Crystals Feature Summary

• Surface mount construction for automated assembly
• AT-cut quartz element for stable oscillation
• RoHS compliant manufacturing process

Crystals Applications

• General purpose clock generation circuits
• Microcontroller system timing references
• Digital communication interface synchronization

Crystals Procurement Notes

Verify the specific suffix FF3F against official ILSI documentation to confirm exact electrical parameters such as ESR and stability. Ensure the ordering part number matches the required surface mount configuration and load capacitance specifications before procurement.

Crystals Selection Notes

Select this component when a standard 4 MHz reference is required in a compact surface mount form factor. Consider the 150 Ohm ESR and 18 pF load capacitance requirements to ensure compatibility with the target oscillator circuit design.

Crystals Part Context

This part belongs to the HC49USM series of surface mount crystals from ILSI America. These components are designed as direct replacements for traditional through-hole HC-49/U crystals, offering similar performance characteristics in a footprint suitable for modern PCB layouts.

Crystals Replacement Considerations

Compatible substitutes include other manufacturers' HC-49/US series crystals with identical 4 MHz frequency, 18 pF load capacitance, and ±30 ppm tolerance. Verify pin compatibility and mounting dimensions when cross-referencing.