18QHTF21-66.500-PD

Overview

The 18QHTF21-66.500-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind., Co., Ltd. It operates at a fixed frequency of 66.5 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 2.0mm x 1.6mm. This component serves as a precise clock source for digital circuits requiring low-profile surface-mount integration.

Feature Summary

• Supports LVCMOS output logic for direct interface with digital loads
• Includes power-down standby capability to minimize energy usage
• Utilizes a small form factor 4-SMD no-lead package design

Applications

• General purpose clock generation for embedded systems
• Timing reference for consumer electronics devices
• Clock source for portable communication equipment

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 PCB footprint matches the 4-SMD no-lead package dimensions provided in the official datasheet to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this model when a low-voltage 1.8V operation is required alongside a compact surface-mount profile. The LVCMOS output is suitable for standard digital logic families. Consider the power-down feature if energy efficiency is critical for battery-operated applications. Verify that the 66.5 MHz frequency meets the specific timing needs of the target microcontroller or processor.

Part Context

Mercury Electronic Ind., Co., Ltd. is a manufacturer specializing in frequency control products with a history dating back to 1973. They are recognized as an early pioneer in the quartz crystal industry within Taiwan. The company produces various oscillators and resonators for industrial and commercial markets, focusing on precision timing solutions.

Replacement Considerations

Cross-reference other models from the 18QHTF21 series with identical pinouts and electrical specifications. Ensure any substitute maintains the 1.8V supply requirement and LVCMOS output type. Verify that the replacement part supports the same 66.5 MHz frequency and physical package dimensions for direct board compatibility.