18QHTF21-20.49978-PD

Oscillators Overview

The 18QHTF21-20.49978-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 20.49978 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications, supporting a supply voltage of 1.8V. It features a standby or power-down function to manage energy consumption when the oscillator is not in active use. The component is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly on printed circuit boards.

Oscillators Feature Summary

• Supports LVCMOS output signal compatibility
• Includes standby and power-down functionality
• Operates with 1.8V supply voltage

Oscillators Applications

• Digital clock signal generation
• Low-voltage electronic circuits
• Surface-mount PCB assembly

Oscillators Procurement Notes

Verify the exact frequency specification of 20.49978 MHz against system requirements. Confirm that the 1.8V operating voltage aligns with the target circuit design. Ensure the 4-SMD No Lead package dimensions fit the available footprint on the printed circuit board. Check for any specific ordering suffixes that may indicate variations in tolerance or temperature range if required by the application.

Oscillators Selection Notes

Select this component when a precise 20.49978 MHz clock source is needed for LVCMOS-compatible digital systems. Consider the 1.8V supply requirement to ensure compatibility with low-power microcontrollers or processors. The integrated power-down feature makes it suitable for battery-operated devices where standby current reduction is critical. Verify that the small form factor meets space constraints within the enclosure.

Oscillators Part Context

This part belongs to the 18QHTF21 series of crystal oscillators from Mercury Electronics Ind. Co., Ltd. The series offers various frequencies tailored for different timing needs. Mercury Electronics has a long history in quartz crystal manufacturing, providing reliable frequency control products. This specific model represents a standard XO variant optimized for modern low-voltage surface-mount applications.

Oscillators Replacement Considerations

Direct substitutes must match the 20.49978 MHz frequency, LVCMOS output, 1.8V supply, and 4-SMD No Lead package. Verify pinout compatibility before swapping. Other manufacturers producing identical specifications can be considered if they meet the same electrical and mechanical standards.