FPXLF040

Crystals Overview

The FPXLF040 is a fundamental quartz crystal resonator manufactured by Fox Electronics, operating at a nominal frequency of 4 MHz. It is housed in a plastic-encased surface-mount device (SMD) package with a 4-SOJ form factor and a 9.40 mm pitch. The component features a load capacitance of 20 pF and an equivalent series resistance of 150 Ohms. It offers a frequency tolerance of ±50 ppm and is designed for standard temperature range applications.

Crystals Feature Summary

• Plastic encapsulated construction for surface-mount assembly
• Fundamental mode quartz crystal operation
• Standard 4-SOJ surface-mount package configuration

Crystals Applications

• General-purpose clock signal generation
• Microcontroller system timing references
• Digital logic circuit synchronization

Crystals Procurement Notes

Verify current availability status as the FPXLF040 is listed as obsolete and no longer manufactured by Fox Electronics. Confirm that substitute components meet all electrical specifications, including frequency stability, load capacitance, and physical footprint dimensions to ensure compatibility with existing designs.

Crystals Selection Notes

Select replacement crystals based on matching fundamental frequency, package type, and electrical parameters such as load capacitance and ESR. Ensure the substitute component supports the required frequency tolerance and operates within the intended environmental temperature range for the specific application.

Crystals Part Context

This component belongs to the Fox Electronics family of plastic-encased SMD crystals. Similar part numbers in this series include the FPXLF049-20 and FPXLF073-20, which share comparable packaging and functional characteristics but differ in their nominal operating frequencies.

Crystals Replacement Considerations

• ECS-40