HC49US-FF3F18-20.000MHZ

Crystals Overview

The HC49US-FF3F18-20.000MHZ is a parallel fundamental quartz crystal from the ILSI HC49US series, designed for through-hole mounting in a standard metal package measuring 11 mm x 4.7 mm. It operates at a nominal frequency of 20 MHz with a load capacitance of 18 pF and a maximum equivalent series resistance (ESR) of 60 Ω. The component supports a drive level of 1 mW and offers a frequency tolerance of ±30 ppm at 25°C. It functions within an operating temperature range of -20°C to +70°C.

Crystals Feature Summary

• Grounded metal package design for low electromagnetic interference
• Compatible with lead-free processing and RoHS compliance
• Standard through-hole mounting configuration

Crystals Applications

• Fibre Channel Server & Storage systems
• Sonet/SDH network equipment
• 802.11 / Wifi infrastructure
• T1/E1 and T3/E3 system clocking

Crystals Procurement Notes

Verify that the specific suffix FF3F18 corresponds to the required 18 pF load capacitance and ±30 ppm tolerance specifications. Confirm the operating temperature range meets the application's environmental requirements, as this variant specifies -20°C to +70°C rather than the broader industrial standard. Ensure the through-hole package dimensions align with the target PCB layout constraints.

Crystals Selection Notes

Select this component when a grounded metal package is required for EMI reduction in through-hole designs. It is suitable for applications needing a 20 MHz reference with moderate stability. Consider alternative series if wider temperature ranges or surface-mount packages are necessary. Verify that the 60 Ω ESR limit is compatible with the oscillator circuit's drive requirements.

Crystals Part Context

This part belongs to the HC49US series of parallel fundamental quartz crystals manufactured by ILSI America. The series provides various frequency options and package configurations for general-purpose timing applications. The HC49US designation indicates a standard metal can package with two leads, widely used in telecommunications and computing hardware.

Crystals Replacement Considerations

Direct substitutes include other HC49US-FF3F18-20.000 variants from different manufacturers offering identical electrical parameters. Cross-reference with HC49USM9 series parts only if surface-mount compatibility is acceptable, noting the package difference.