DF18CC1-4.500MHZ-T

Crystals Overview

The DF18CC1-4.500MHZ-T is a surface-mount crystal oscillator manufactured by MMD (Abracon). It operates at a fundamental frequency of 4.5 MHz with a frequency tolerance of ±15ppm and stability of ±30ppm over the operating temperature range. The component features a load capacitance of 18pF and an equivalent series resistance (ESR) of 120 Ohms. It utilizes the HC-49/US package, measuring 11.70mm in length, 5.00mm in width, and 4.50mm in maximum height. The device supports a wide operating temperature range from -40°C to +85°C.

Crystals Feature Summary

• Surface mount design compatible with automated assembly processes
• Fundamental mode operation for precise frequency control
• RoHS compliant construction for environmental safety

Crystals Applications

• Microcontroller clock sources
• Communication interface timing circuits
• Industrial control system oscillators

Crystals Procurement Notes

Verify the specific ESR value of 120 Ohms against circuit requirements, as this differs from other frequencies in the series. Confirm the HC-49/US footprint dimensions match the PCB layout. Ensure the ±15ppm tolerance meets the system's frequency accuracy needs. Check RoHS compliance status if required by project specifications.

Crystals Selection Notes

Select this part when a 4.5 MHz fundamental frequency is required in a standard SMD package. Consider the 120 Ohm ESR impact on oscillator circuit loading. Compare against the broader DFXXDC1 series for alternative stability or temperature ranges if stricter specifications are needed. Verify compatibility with the target oscillator IC drive levels.

Crystals Part Context

This component belongs to the D and F Series of HC-49/US surface-mounted crystals from MMD. It shares the physical form factor with through-hole equivalents but is optimized for SMT reflow processes. The series offers various frequencies and tolerances, providing flexibility for different timing applications within the same mechanical envelope.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' 4.5 MHz HC-49/US SMD crystals with matching 18pF load capacitance and similar ESR values. Cross-reference with Abracon's own variants like the DF18CC1-4.000MHZ-T if frequency adjustment is possible. Ensure any replacement maintains the ±15ppm tolerance and -40°C to +85°C operating range.