18QHTF21-12.5458-OE

Overview

The 18QHTF21-12.5458-OE is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 12.5458 MHz and utilizes LVCMOS output logic levels. The device supports an enable/disable control function via its supply voltage interface, which operates at 1.8V. The component is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications requiring precise timing signals.

Feature Summary

• LVCMOS output signal compatibility
• Integrated enable/disable control functionality
• Hermetic ceramic leadless SMD construction

Applications

• Digital clock distribution systems
• Data communication interfaces
• Microprocessor timing references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target circuit design. Ensure the 4-SMD no-lead package dimensions match the PCB footprint to prevent assembly errors during manufacturing.

Selection Notes

Select this component when a stable 12.5458 MHz reference is required with low power consumption. The LVCMOS interface suits digital logic families operating at 1.8V. Consider the enable feature for power management strategies in battery-operated devices requiring periodic clock activation.

Part Context

This part belongs to the QHTF series from Mercury Electronic, which offers various hermetic ceramic leadless packages. The series supports frequencies ranging from 1.0 MHz to 200 MHz across different supply voltages. This specific model represents a standard XO variant optimized for precision timing in compact electronic assemblies.

Replacement Considerations

Cross-reference other 18QHTF21 variants with identical 12.5458 MHz frequency and 1.8V operation. Verify pinout compatibility and electrical characteristics before substituting with equivalent oscillators from other manufacturers.