HC49USM-FF3F18-7.3728MHZ

Crystals Overview

The ILSI HC49USM-FF3F18-7.3728MHZ is a surface-mount quartz crystal resonator designed for frequency control applications. It operates at a nominal frequency of 7.3728 MHz with a load capacitance of 18 pF and a frequency stability of ±30 ppm. The component utilizes the HC-49/US package, measuring 11.4 mm in length, 4.7 mm in width, and 4.5 mm in maximum height. It features an equivalent series resistance (ESR) of 80 Ohms and supports a fundamental parallel oscillation mode. The device is rated for operation within a temperature range of -40°C to +85°C and complies with RoHS standards.

Crystals Feature Summary

• Surface-mount construction utilizing the standardized HC-49/US package format
• Fundamental parallel resonance mode operation for stable clock generation
• Compliance with lead-free processing and RoHS environmental directives

Crystals Applications

• Microcontroller clock source circuits
• Communication interface timing references
• General-purpose digital logic timing

Crystals Procurement Notes

Verify that the specific suffix FF3F18 corresponds to the required 18 pF load capacitance and ±30 ppm stability specifications for the target circuit design. Confirm that the surface-mount HC-49/US footprint matches the PCB layout constraints. Ensure the operating temperature range of -40°C to +85°C meets the environmental requirements of the final application. Cross-reference the manufacturer datasheet to validate the ESR value of 80 Ohms against oscillator circuit requirements.

Crystals Selection Notes

Select this component when a standard 7.3728 MHz frequency is required for microcontroller or communication systems. The HC-49/US SMD form factor offers a balance between mechanical robustness and space efficiency compared to smaller packages. The 18 pF load capacitance is a common industry standard, simplifying integration into existing oscillator designs. Consider the 80 Ohm ESR when designing the oscillator feedback network to ensure reliable startup.

Crystals Part Context

This part belongs to the HC49USM series of quartz crystals manufactured by ILSI America. The series provides various frequency options within the same physical package dimensions. The HC-49/US package is widely adopted across the electronics industry for both through-hole and surface-mount applications, ensuring broad compatibility with manufacturing processes and automated assembly equipment.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US crystals with identical 7.3728 MHz frequency, 18 pF load capacitance, and ±30 ppm stability. Verify that alternative parts maintain the same 80 Ohm ESR and physical dimensions to ensure mechanical fit and electrical performance parity.