18QHTF21-66.000-PD

Overview

The 18QHTF21-66.000-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a fixed frequency of 66.0 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a power-down standby function to reduce consumption during inactive periods. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm, suitable for surface-mount assembly.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes power-down standby functionality for energy efficiency
• Utilizes a small form factor SMD package for space-constrained designs

Applications

• General-purpose clock signal generation in electronic circuits
• Timing reference sources for digital systems requiring 66 MHz stability
• Embedded devices utilizing low-voltage 1.8V power domains

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD no-lead package footprint matches your PCB layout constraints. Check for any specific operating temperature range limitations defined in the manufacturer datasheet.

Selection Notes

Select this component when a precise 66.0 MHz clock source is required for LVCMOS-compatible logic families. The choice is driven by the need for a low-profile 2.0x1.6mm package and integrated power management via the standby pin. Consider the 1.8V operating voltage as a primary constraint for power supply design.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronic Ind. Co., Ltd, which specializes in quartz crystal frequency control products. The series offers various frequencies within a standardized 1.8V LVCMOS format. The 'PD' suffix indicates the inclusion of a power-down feature, distinguishing it from standard continuous-operation oscillators in the same physical package family.

Replacement Considerations

Direct replacements must match the 66.0 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm package dimensions. Verify pinout compatibility for the power-down control signal. Cross-reference with other manufacturers offering similar SMD XO specifications if Mercury Electronics inventory is unavailable.