18QHTF21-20.49978-OE

Oscillators Overview

The 18QHTF21-20.49978-OE is a standard crystal oscillator manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 20.49978 MHz and utilizes LVCMOS output logic levels. The device supports a supply voltage range typically associated with the 18QHTF21 series, featuring an enable/disable control function for power management. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications requiring precise timing signals.

Oscillators Feature Summary

• LVCMOS output interface for digital logic compatibility
• Integrated enable/disable control functionality
• Compact 4-SMD no-lead surface mount package

Oscillators Applications

• General-purpose clock signal generation
• Timing reference for embedded systems
• Digital circuit synchronization

Oscillators Procurement Notes

Verify the specific operating voltage and load capacitance requirements against the target system design before procurement. Confirm that the 4-SMD package dimensions align with the PCB footprint. Ensure the enable pin logic level matches the controlling microcontroller or GPIO output to guarantee proper activation and deactivation cycles during operation.

Oscillators Selection Notes

Select this component when a fixed frequency of 20.49978 MHz is required with low-cost surface-mount integration. Consider the LVCMOS output swing limits relative to the receiving input thresholds. Evaluate the enable feature necessity for power-sensitive designs compared to continuously running oscillators.

Oscillators Part Context

This part belongs to the 18QHTF21 series of standard crystal oscillators from Mercury Electronic. The series offers various frequencies with consistent packaging and electrical characteristics, facilitating inventory simplification across different product lines requiring similar form factors and interface standards.

Oscillators Replacement Considerations

Direct substitutes include other 18QHTF21 series variants with identical pinouts but different frequencies, provided the system allows frequency adjustment. Cross-brand replacements must match the 4-SMD package, LVCMOS output type, and compatible supply voltage ranges.