HC49US-FF5F18-4.000MHZ

Crystals Overview

The HC49US-FF5F18-4.000MHZ is a fundamental mode quartz crystal resonator manufactured by ILSI America. It operates at a nominal frequency of 4 MHz with a frequency tolerance and stability of ±30 ppm. The component features a load capacitance of 18 pF and an equivalent series resistance (ESR) of 150 Ohms. Designed for through-hole mounting, it utilizes the standard HC-49/US package, measuring approximately 11 mm in length and 4.7 mm in width. The device supports a driving level of 1 mW and functions within an operating temperature range of -40°C to +85°C.

Crystals Feature Summary

• Fundamental parallel resonance operation utilizing AT-cut quartz technology
• Standardized HC-49/US surface mount compatible through-hole package design
• Compliant with lead-free processing and RoHS environmental standards

Crystals Applications

• Microcontroller clock source circuits
• General purpose timing references
• Consumer electronic device oscillators

Crystals Procurement Notes

Verify the specific suffix FF5F18 against official ILSI documentation to confirm exact electrical parameters such as ESR and load capacitance. Ensure the procurement channel provides valid manufacturer traceability. Confirm that the HC-49/US package dimensions align with the target PCB footprint requirements before finalizing orders.

Crystals Selection Notes

Select this component when a 4 MHz fundamental frequency is required with moderate stability specifications. The 150 Ohm ESR value suits standard oscillator circuit designs without excessive loading. Consider the through-hole HC-49/US form factor for applications requiring robust mechanical mounting or compatibility with existing legacy board layouts.

Crystals Part Context

This part belongs to the HC49US series of quartz crystals from ILSI America. The series offers various frequency options within the same physical package envelope. The HC-49/US case is a widely adopted industry standard for discrete crystal components, ensuring broad availability across multiple manufacturing ecosystems and testing equipment.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US 4 MHz crystals with matching 18pF load capacitance and similar ESR values. Verify that alternative parts maintain the same ±30 ppm tolerance and operating temperature range to ensure circuit compatibility.