HC49US-FF3F18-27.000MHZ

Crystals Overview

The ILSI HC49US-FF3F18-27.000MHZ is a parallel fundamental mode quartz crystal resonator designed for through-hole mounting in the standard HC-49/US metal package. It operates at a nominal frequency of 27.000 MHz with a load capacitance of 18 pF and a drive level of 1 mW (1000 µW). The component offers a frequency tolerance of ±30 ppm and a stability of ±30 ppm, operating within a temperature range of -40°C to +85°C.

Crystals Feature Summary

• AT-cut quartz construction for stable oscillation
• Grounded metal package design for low EMI
• RoHS compliant and lead-free processing compatible

Crystals Applications

• System clock generation
• T1/E1 and T3/E3 telecommunications interfaces
• Wi-Fi and 802.11 wireless modules
• SONET/SDH network equipment

Crystals Procurement Notes

Verify that the specific suffix matches the required tolerance and aging specifications. Confirm the package variant corresponds to the intended PCB footprint. Ensure the drive level requirements of the host oscillator circuit are compatible with the 1 mW rating to prevent frequency drift or damage.

Crystals Selection Notes

Select this component when a standard through-hole HC-49/US form factor is required for 27 MHz applications. It is suitable for designs needing moderate stability without the cost of higher-grade industrial crystals. Consider surface-mount variants if space constraints prohibit the use of the larger metal can package.

Crystals Part Context

This part belongs to the ILSI HC49US series of parallel fundamental quartz crystals. The series provides a cost-effective solution for general-purpose timing applications. The HC-49/US package is a widely recognized industry standard for through-hole crystal implementations.

Crystals Replacement Considerations

Cross-reference with other manufacturers offering HC-49/US packages at 27 MHz with 18 pF load capacitance. Verify that equivalent parts meet the same ±30 ppm tolerance and -40°C to +85°C operating temperature range.