DF18CC1-4.000MHZ-T

Crystals Overview

The DF18CC1-4.000MHZ-T is a surface mount crystal oscillator manufactured by MMD, part of the D Series. It operates at a nominal frequency of 4 MHz with a frequency tolerance of ±15ppm and stability of ±30ppm. The component features an equivalent series resistance (ESR) of 120 Ohms and a load capacitance of 18pF. Designed for fundamental mode operation, it utilizes an HC-49/US package measuring 11.70mm x 5.00mm x 4.50mm maximum height. The device supports an operating temperature range of -40°C to +85°C.

Crystals Feature Summary

• Surface mount construction in standard HC-49/US form factor
• Fundamental mode quartz crystal operation
• RoHS compliant manufacturing process

Crystals Applications

• General purpose timing circuits
• Microcontroller clock sources
• Digital logic synchronization

Crystals Procurement Notes

Verify the specific suffix 'T' indicates tape and reel packaging configuration when reviewing distributor listings. Confirm that the ESR value aligns with circuit requirements, as variations may exist across different production lots or closely related part numbers within the same series. Ensure compatibility with reflow soldering profiles specified in the manufacturer datasheet.

Crystals Selection Notes

Select this component when a 4 MHz reference signal is required in a surface mount design. The 18pF load capacitance must match the oscillator circuit's external capacitors to ensure accurate frequency generation. Consider the ±15ppm initial tolerance against system phase noise requirements. Verify that the 120 Ohm ESR falls within the driving capability limits of the host oscillator IC.

Crystals Part Context

This part belongs to MMD's D Series of crystals, which offers wide frequency ranges from 3.2 MHz to 80 MHz. The series supports both fundamental and third overtone modes. MMD, supported by Abracon, provides these components for frequency control applications requiring flexibility in supply chain and technical support. The HC-49/US package allows for easy transition from through-hole designs to surface mount PCB layouts.

Crystals Replacement Considerations

Cross-reference with other manufacturers offering HC-49/US SMD crystals at 4 MHz with 18pF load capacitance. Verify that substitute parts meet the same ±15ppm tolerance and 120 Ohm ESR specifications. Ensure the replacement component supports the same operating temperature range of -40°C to +85°C.