18QHTF21-124.444-PD

Overview

The 18QHTF21-124.444-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 124.444 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. A key functional characteristic is the inclusion of a standby mode, which allows for power-down control to reduce 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 processes.

Feature Summary

• LVCMOS output logic compatibility
• Integrated standby (power down) functionality
• Compact 4-SMD no lead surface mount package

Applications

• Digital signal processing systems
• Communication equipment clocking
• Embedded system timing references

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD footprint matches your PCB layout constraints. Cross-reference the datasheet for jitter specifications if high-precision timing is required.

Selection Notes

Select this model when a 124.444 MHz reference is needed with low power consumption capabilities. The LVCMOS interface ensures compatibility with standard digital logic families. Consider the standby feature for battery-operated or power-sensitive designs. Verify that the 1.8V operation fits within your available voltage budget compared to 2.5V or 3.3V alternatives.

Part Context

This part belongs to the QHTF21 series of surface-mount oscillators from Mercury Electronics. The series typically offers various frequencies and voltage options. The 'PD' suffix indicates the presence of a power-down pin or function. This specific variant is optimized for 1.8V operation, distinguishing it from higher voltage counterparts in the same physical package family.

Replacement Considerations

Direct substitutes may include other 124.444 MHz LVCMOS oscillators in 4-SMD packages with 1.8V operation and standby features. Verify pinout compatibility and electrical parameters such as jitter and phase noise. Check for equivalent thermal performance and operating temperature ranges.