18QHTF21-64.780-PD

Overview

The 18QHTF21-64.780-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 64.78 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down 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. 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 standby mode capability for power management
• Utilizes a small form factor 4-SMD no lead package

Applications

• General purpose clock generation for embedded systems
• Timing reference for high-speed data communication interfaces
• Clock source for microcontroller and FPGA circuits

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the system power rails. Ensure the PCB footprint matches the 2.0x1.6mm SMD package dimensions to guarantee proper soldering and mechanical stability during assembly processes.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a compact surface-mount profile. The LVCMOS output is suitable for standard logic families. Consider the standby feature if power efficiency during idle states is a critical design constraint. Verify that the 64.78 MHz frequency meets the specific timing needs of the application without requiring external dividers.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which focuses on miniature oscillators. The series typically offers various frequencies within a standardized 2.0x1.6mm footprint. The 'PD' suffix indicates the inclusion of a power-down control pin, distinguishing it from continuously running variants in the same family.

Replacement Considerations

Direct substitutes must match the 64.78 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Check manufacturer datasheets for equivalent parts from other vendors offering identical electrical characteristics and pinout configurations to ensure compatibility.