18QHTF21-120.9375-PD

Overview

The 18QHTF21-120.9375-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 120.9375 MHz with an LVCMOS output logic level. The device requires a 1.8V supply voltage and features a Standby (Power Down) control function for power 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 interface for digital circuit compatibility
• Integrated standby mode for power reduction
• Compact surface-mount form factor

Applications

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

Procurement Notes

Verify the specific suffix PD indicates the Standby (Power Down) functionality when reviewing datasheets. Confirm the 1.8V supply requirement matches the target system design. Ensure the 4-SMD No Lead package dimensions are compatible with the PCB footprint. Cross-reference the part number with official Mercury Electronics documentation to confirm availability and specifications.

Selection Notes

Select this component when a 120.9375 MHz clock source with LVCMOS outputs is required. The 1.8V operating voltage must align with the system's power rails. The standby feature should be utilized if power efficiency during idle states is a design priority. Verify that the physical package size fits within the available board space constraints.

Part Context

This model belongs to the 18QHTF21 series of crystal oscillators from Mercury Electronics. The series typically offers various frequencies and supply voltages. The 'PD' suffix specifically denotes the inclusion of a power-down or standby control pin, distinguishing it from models without this feature.

Replacement Considerations

Direct replacements must match the 120.9375 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD No Lead package. Models with different control functions (e.g., OE instead of PD) may require circuit modification. Verify electrical parameters against the original datasheet before substitution.