18QHTF21-66.658-PD

Overview

The 18QHTF21-66.658-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 66.658 MHz and utilizes LVCMOS output logic. The device functions with a supply voltage of 1.8V and includes a standby or power-down feature 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

• Supports low-voltage operation at 1.8V
• Includes standby mode capability
• Provides LVCMOS output signal

Applications

• Digital clock generation
• Data communication interfaces
• Microcontroller timing sources

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure the 1.8V supply rail stability meets the oscillator's specifications. Confirm that the PCB footprint matches the 4-SMD no-lead package dimensions to avoid assembly issues during manufacturing.

Selection Notes

Select this component when a stable 66.658 MHz reference is required for LVCMOS-compatible digital circuits. Consider the 1.8V operating voltage constraint and the need for a power-down feature. Evaluate the 4-SMD package size against available board space constraints compared to larger through-hole alternatives.

Part Context

This part belongs to the Mercury Electronics 18QHTF21 series of surface-mount oscillators. The series typically offers various frequencies within a small form factor. The 'PD' suffix indicates the inclusion of a power-down control function, distinguishing it from continuous-operation variants in the same physical package family.

Replacement Considerations

Direct substitutes must match the 66.658 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pin compatibility and electrical characteristics. Cross-reference with other manufacturers offering similar SMD oscillators if Mercury Electronics availability is limited.