18QHTF21-77.0325-PD

Overview

The 18QHTF21-77.0325-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 77.0325 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby function for power-down control. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications requiring precise timing signals.

Feature Summary

• LVCMOS output logic for digital interface compatibility
• Integrated standby mode for power management
• Surface-mount construction with no lead design

Applications

• General purpose clock signal generation
• Digital system timing references
• Embedded controller clock inputs

Procurement Notes

Verify the specific ordering suffix to ensure the correct package variant and tolerance specifications match the design requirements. Confirm that the 1.8V supply voltage aligns with the target circuit's power rails. Ensure the LVCMOS output swing is compatible with the receiving logic levels. Check for any specific RoHS or environmental compliance documentation if required by the project standards.

Selection Notes

Select this component when a fixed 77.0325 MHz reference is required with low power consumption. The 1.8V operation makes it suitable for modern low-voltage digital systems. The standby feature allows for power savings during idle periods. Consider the 4-SMD footprint for PCB layout constraints and automated assembly processes.

Part Context

This oscillator belongs to Mercury Electronics' standard XO series, which provides reliable frequency control solutions. The company has a long history in quartz crystal manufacturing, offering various SMD packages. This specific model represents a transition to lead-free surface mount technology while maintaining stable performance across operating temperatures.

Replacement Considerations

Direct substitutes include other 77.0325 MHz LVCMOS oscillators in similar 4-SMD packages from manufacturers such as Epson, NDK, or SiTime. Verify pinout compatibility and electrical parameters before substitution. Alternative part numbers within the same family may offer different tolerances or temperature ranges.