HC49US-FF5F18-16.000MHZ

Crystals Overview

The ILSI HC49US-FF5F18-16.000MHZ is a parallel fundamental quartz crystal resonator designed for surface mount applications. It operates at a nominal frequency of 16 MHz with a frequency tolerance and stability of ±30 ppm across the industrial temperature range of -40°C to +85°C. The component utilizes an HC-49/US package, measuring approximately 11.4 mm in length, 4.7 mm in width, and 3.5 mm to 4.5 mm in height depending on specific variant data. It features a load capacitance of 18 pF and an equivalent series resistance (ESR) of 40 Ohms. The device supports a maximum drive level of 1 mW and is compliant with RoHS standards for lead-free processing.

Crystals Feature Summary

• Surface mount construction within the standardized HC-49/US metal package
• AT-cut quartz element ensuring stable oscillation characteristics
• Industrial grade thermal performance spanning -40°C to +85°C
• RoHS compliant manufacturing compatible with lead-free assembly processes

Crystals Applications

• General purpose timing circuits requiring precise clock references
• Microcontroller and microprocessor system clocks
• Communication interface modules
• Consumer electronics requiring stable frequency generation

Crystals Procurement Notes

Verify the exact physical height specification against the manufacturer's current datasheet, as sources indicate variations between 3.5 mm and 4.5 mm for this part number. Confirm that the 40 Ohm ESR value aligns with your circuit design requirements. Ensure the ordering suffix matches the required packaging format, such as tape and reel or cut tape, to avoid handling discrepancies during assembly.

Crystals Selection Notes

Select this component when a standard surface mount footprint is required alongside moderate frequency stability. The 18 pF load capacitance must match the oscillator circuit design to achieve the specified ±30 ppm accuracy. Consider the 40 Ohm ESR limit to ensure adequate drive level margin. This part is suitable for general industrial applications where cost-effectiveness and standard mounting are prioritized over ultra-high precision.

Crystals Part Context

This model belongs to the HC49US series of quartz crystals manufactured by ILSI America. The series offers various frequency options within the HC-49/US form factor, catering to both through-hole and surface mount needs. The FF5F18 suffix typically denotes specific electrical parameters including the 18 pF load capacitance and frequency tolerance. These components are widely used in digital systems requiring reliable clock signals.

Crystals Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US surface mount crystals with identical 16 MHz frequency, 18 pF load capacitance, and ±30 ppm stability. Verify mechanical dimensions, particularly height, to ensure PCB compatibility. Cross-reference ESR values to maintain oscillator startup reliability.