HC49USM-FF3F18-27.000MHZ

Crystals Overview

The ILSI HC49USM-FF3F18-27.000MHZ is a surface-mount quartz crystal operating at a nominal frequency of 27 MHz. It utilizes the HC-49/US package with dimensions of 11.40 mm length, 4.73 mm width, and a maximum seated height of 4.50 mm. The component features a load capacitance of 18 pF and an equivalent series resistance (ESR) of 30 Ohms. Frequency tolerance and stability are rated at ±30 ppm. The device 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 in standard HC-49/US metal package
• Low equivalent series resistance for efficient circuit operation
• Compatible with lead-free processing standards

Crystals Applications

• T1/E1 and T3/E3 system clock generation
• SONET/SDH network synchronization
• Wi-Fi and 802.11 wireless communication modules

Crystals Procurement Notes

Verify that the specific suffix FF3F18 corresponds to the required 18 pF load capacitance and 30 Ohm ESR specifications. Confirm the surface-mount variant matches the target PCB footprint. Ensure the temperature rating meets the operational environment requirements. Cross-reference the manufacturer's official datasheet for precise mechanical tolerances before finalizing procurement orders.

Crystals Selection Notes

Select this component when a 27 MHz fundamental frequency is required in a compact surface-mount form factor. The 18 pF load capacitance must match the oscillator circuit design. Consider the 30 ppm stability for applications requiring moderate precision. The HC-49/US package offers a balance between size and thermal performance for industrial environments.

Crystals Part Context

This part belongs to the ILSI HC49USM series of surface-mount quartz crystals. It shares the physical footprint with through-hole HC49U variants but is optimized for automated SMD assembly. The series provides various frequency options while maintaining consistent electrical characteristics across the product line.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US 27 MHz crystals with identical 18 pF load capacitance and ≤30 ppm stability. Verify pin compatibility and mounting height constraints. Ensure the replacement part meets the same RoHS compliance and lead-free processing requirements.