HC49U/N-R 20.000000

Overview

The HC49U/N-R 20.000000 is a parallel fundamental quartz crystal resonator manufactured by MtronPTI. It operates at a nominal frequency of 20 MHz with a frequency tolerance of ±30 ppm and stability of ±50 ppm. The component utilizes an AT-cut resonator element housed in an HC-49 U/N surface-mount package, specifically the gull-wing configuration. Key electrical parameters include a load capacitance of 18 pF and an equivalent series resistance (ESR) of 25 Ohms. The device supports a drive level of 100 µW and functions within a temperature range of -10°C to 70°C.

Feature Summary

• AT-cut quartz resonator element for stable oscillation
• Surface-mount gull-wing package design
• Parallel fundamental resonance mode operation

Applications

• General purpose clock signal generation
• Microcontroller oscillator circuits
• Digital communication interfaces

Procurement Notes

Verify that the specific ordering suffix matches the required gull-wing package variant, as the HC-49U/N series includes through-hole options. Confirm the exact frequency tolerance and stability requirements align with the ±30 ppm and ±50 ppm specifications provided. Ensure the circuit drive level does not exceed 100 µW to prevent frequency pulling or crystal damage. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a surface-mount solution is required for a 20 MHz reference frequency. The HC-49U/N form factor offers a larger footprint than standard SMD crystals, which may simplify manual placement or rework processes. Consider the 18 pF load capacitance requirement when designing the oscillator circuit to ensure accurate frequency tuning. Evaluate the 25 Ohm ESR against the oscillator amplifier's capability to sustain oscillation reliably.

Part Context

This part belongs to the HC-49U/N series of surface-mount crystals from MtronPTI. Unlike traditional through-hole HC-49/U cans, this variant features gull-wing leads for direct PCB mounting. The series provides a robust alternative to smaller SMD packages like 3225 or 2012, offering better mechanical stability while maintaining surface-mount compatibility. It serves as a bridge between legacy through-hole designs and modern miniaturized components.

Replacement Considerations

Direct replacements must match the 20 MHz frequency, HC-49U/N gull-wing package, and 18 pF load capacitance. Verify that substitute parts support the same 100 µW drive level and operate within the -10°C to 70°C temperature range. Cross-reference ESR values to ensure oscillator startup reliability.