E1SFA18-4.000M TR

Crystals Overview

The E1SFA18-4.000M TR is a quartz crystal resonator from the Ecliptek E1S series, designed for surface mount applications. It features an HC-49/UP short package with two pads and a height of 3.2mm. The nominal frequency is 4.000MHz with a load capacitance of 18pF. Frequency tolerance is ±30ppm at 25°C and ±50ppm over the operating range of -40°C to +85°C. Aging is specified at ±5ppm/year maximum. Key electrical parameters include a shunt capacitance (C0) of 7pF maximum, equivalent series resistance of 200 ohms maximum, and a drive level of 1mWatt maximum. It utilizes AT-cut fundamental mode operation.

Crystals Feature Summary

• Surface mount construction using HC-49/UP short package format
• Resistance welded metal seal for environmental protection
• AT-cut fundamental mode of operation for stable resonance
• RoHS compliant and lead-free manufacturing

Crystals Applications

• General purpose clock signal generation in electronic circuits
• Microcontroller and microprocessor system timing references
• Communication equipment requiring precise frequency stability
• Consumer electronics utilizing surface mount assembly processes

Crystals Procurement Notes

Verify that the specific order matches the E1SFA18-4.000M TR designation, noting the 'TR' suffix indicates tape and reel packaging. Confirm RoHS compliance requirements align with project standards. Ensure the receiving facility has appropriate handling procedures for surface mount components. Cross-reference the manufacturer's latest datasheet for any updates on mechanical dimensions or electrical specifications before finalizing procurement decisions.

Crystals Selection Notes

Select this component when a 4MHz surface mount crystal with 18pF load capacitance is required. Consider the HC-49/UP short form factor for space-constrained PCB layouts. Evaluate the ±50ppm stability specification against system timing requirements across the -40°C to +85°C temperature range. Compare the 200 ohm maximum ESR with oscillator circuit design constraints to ensure proper startup and oscillation reliability.

Crystals Part Context

This part belongs to the Ecliptek E1S series of quartz crystal resonators. The series offers various frequencies and package options for surface mount applications. The E1SFA18-4.000M TR specifically addresses the need for compact, reliable timing solutions in modern electronics. It complements other variants in the lineup that may offer different frequencies, tolerances, or package styles.

Crystals Replacement Considerations

Direct substitutes must match the 4MHz frequency, 18pF load capacitance, and HC-49/UP short SMD package. Verify equivalent electrical parameters including tolerance, stability, and ESR. Check for compatible mounting footprint and height restrictions. Alternative parts from other manufacturers should be evaluated for pin compatibility and performance equivalence.