18QHTF21-66.405819-PD

Overview

The 18QHTF21-66.405819-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 66.405819 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down function to manage energy consumption during inactive periods. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• Supports low-voltage operation with 1.8V supply requirement
• Includes standby mode capability for power management
• Provides LVCMOS digital output signal
• Utilizes leadless SMD package for board space efficiency

Applications

• Digital signal processing systems requiring precise clock synchronization
• Communication equipment utilizing standard frequency references
• Embedded control units needing low-power oscillation sources
• Data acquisition hardware requiring stable timing inputs

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your system design before ordering. Confirm that the 1.8V supply rail is stable and within specification limits to ensure reliable oscillator performance. Ensure the PCB footprint matches the 4-SMD no-lead package dimensions provided in the official datasheet to prevent assembly issues.

Selection Notes

Select this component when a fixed 66.405819 MHz reference is required with minimal power consumption. Consider the LVCMOS interface compatibility with downstream logic circuits. Evaluate the thermal environment to ensure operation remains within specified temperature ranges. Compare package size constraints against available board real estate for optimal integration.

Part Context

This part belongs to the 18QHTF21 series of standard crystal oscillators from Mercury Electronics. The series offers various frequencies with consistent 1.8V operation and LVCMOS outputs. The suffix PD indicates the inclusion of a power-down feature, distinguishing it from continuous-operation variants within the same family.

Replacement Considerations

Direct substitutes must match the 66.405819 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility and electrical characteristics such as phase noise and jitter specifications before cross-referencing alternative manufacturers.