18QHTF21-66.3552-PD

Overview

The 18QHTF21-66.3552-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 66.3552 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a Standby (Power Down) control function. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes Standby (Power Down) functionality for power management
• Utilizes quartz-based technology for frequency stability

Applications

• General purpose clock signal generation
• Digital circuit timing references
• Embedded systems requiring low-voltage operation

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target application design before procurement. Ensure the 1.8V supply voltage aligns with the system power rails. Confirm that the 4-SMD No Lead package footprint matches the PCB layout specifications to ensure proper soldering and mechanical retention during assembly processes.

Selection Notes

Select this component when a precise 66.3552 MHz clock source is required within a space-constrained environment. The choice is driven by the need for LVCMOS compatibility and low-power standby capabilities. Consider the 1.8V operating voltage constraint and the small 2.0x1.6 mm form factor as primary selection criteria for portable or high-density electronic designs.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series offers various frequencies while maintaining consistent electrical characteristics and package dimensions. The 'PD' suffix indicates the inclusion of a power-down feature, distinguishing it from non-stanby variants within the same physical footprint family.

Replacement Considerations

Direct replacements must match the 66.3552 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD No Lead package. Verify pinout compatibility and thermal characteristics. Cross-reference with other manufacturers offering identical quartz oscillator specifications to ensure functional equivalence without redesigning the host circuit.