18QHTF21-123.400-PD

Overview

The 18QHTF21-123.400-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 123.4 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• LVCMOS output logic interface
• Integrated standby and power-down functionality
• Compact 4-SMD no-lead surface mount package

Applications

• General clock signal generation
• Digital system timing reference
• Embedded electronics control

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the target application design before procurement. Confirm that the 1.8V supply voltage aligns with the system power architecture. Ensure the 4-SMD footprint matches the PCB layout constraints to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this component when a 123.4 MHz clock source with LVCMOS compatibility is required. Consider the 1.8V supply constraint and the need for power-down capabilities. Evaluate the thermal performance and size limitations of the 4-SMD package relative to the enclosure space available in the final electronic product design.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystals and oscillators. The series typically offers various frequencies and packages. This specific model provides a high-frequency option within the standard XO category, designed for modern digital circuits needing reliable timing sources.

Replacement Considerations

Check datasheets for compatible parts offering identical 123.4 MHz frequency, LVCMOS output, and 1.8V operation. Verify pinout and package dimensions match the 4-SMD form factor to ensure direct replacement without PCB redesign.