HC49USM-FF3F18-8.000MHZ

Crystals Overview

The ILSI HC49USM-FF3F18-8.000MHZ is a surface-mount parallel fundamental quartz crystal operating at a nominal frequency of 8 MHz. It features an 18 pF load capacitance and ±30 ppm frequency tolerance. The component utilizes AT-cut technology with a maximum equivalent series resistance (ESR) of 80 Ohms and a drive level of 1 mW. Physical dimensions are approximately 11.4 mm x 4.7 mm, housed in an HC-49/US package.

Crystals Feature Summary

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

Crystals Applications

• Microcontroller clock generation
• Communication interface timing
• General-purpose digital circuit synchronization

Crystals Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to ensure compatibility with required frequency stability and load capacitance specifications. Confirm that the surface-mount variant matches the target PCB footprint and soldering profile requirements before finalizing procurement orders.

Crystals Selection Notes

Select this component when a standard 8 MHz reference is required for space-constrained designs. Ensure the application circuit supports the specified 18 pF load capacitance to maintain accuracy within the ±30 ppm tolerance. Verify that the 1 mW drive level is sufficient for the oscillator circuit without causing overdriving or frequency shifts.

Crystals Part Context

This part belongs to the HC49USM series, representing a common surface-mount form factor for quartz crystals. It serves as a direct replacement for through-hole HC-49/U variants where board space is limited. The series is widely used in consumer electronics and industrial control systems requiring reliable frequency references.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US packages rated at 8 MHz with 18 pF load capacitance and similar ESR limits. Verify pin compatibility and physical dimensions to ensure seamless integration into existing layouts.