18QHTF21-66.700-PD

Overview

The 18QHTF21-66.700-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a fixed frequency of 66.7 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 when inactive. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm x 1.6mm.

Feature Summary

• Supports low-voltage operation at 1.8V
• Includes power-down standby capability
• Utilizes LVCMOS output interface

Applications

• General clock signal generation
• Digital circuit timing reference
• Embedded system synchronization

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your design specifications before procurement. 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 required by your application environment.

Selection Notes

Select this component when a precise 66.7 MHz clock source is required for LVCMOS-compatible digital circuits. The choice is driven by the need for a low-profile 2.0x1.6mm form factor and integrated power management via the standby pin. Consider the manufacturer's historical focus on quartz crystals for potential reliability benefits in frequency control applications.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series typically offers various frequencies within a small footprint, catering to space-constrained portable electronics. Mercury Electronics is noted as a pioneer in the Taiwanese quartz crystal industry, providing specialized frequency control solutions.

Replacement Considerations

Direct substitutes include other 66.7 MHz LVCMOS oscillators in 4-SMD packages with 1.8V operation, such as the 18QHTF21-66.700 variant without the PD suffix if power-down is not needed. Cross-reference pinouts and electrical characteristics carefully to ensure compatibility.