18QHTF21-64.440-PD

Overview

The 18QHTF21-64.440-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 64.44 MHz with an LVCMOS output logic level. The device requires a 1.8V supply voltage and features a Standby (Power Down) control function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports Low Voltage CMOS (LVCMOS) output interface
• Includes Standby (Power Down) functionality
• Designed for low voltage operation at 1.8V

Applications

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

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 reflow soldering profile recommendations provided by the manufacturer to ensure reliability during assembly processes.

Selection Notes

Select this component when a precise 64.44 MHz clock source is required for digital systems operating at 1.8V. The LVCMOS output is suitable for direct interfacing with standard logic families. Consider the small 2.0x1.6 mm package size for space-constrained designs. The standby feature allows for power optimization in battery-operated or portable applications where idle power consumption must be minimized.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz frequency control products. The series includes various frequencies such as 77.76 MHz, 51.2 MHz, and 15.7 MHz, all sharing similar package and electrical characteristics. Mercury Electronics has a long history in manufacturing quartz crystals and oscillators, positioning itself as a pioneer in the Taiwan frequency-control industry since 1973.

Replacement Considerations

Direct substitutes within the same series include 18QHTF21-77.760-PD, 18QHTF21-51.200-PD, and 18QHTF21-15.700-PD, though these operate at different frequencies. When replacing, ensure the new part matches the 64.44 MHz frequency requirement exactly. Verify compatibility with the 1.8V supply and LVCMOS output levels. The physical package dimensions remain consistent across the series, facilitating potential mechanical interchangeability if frequency permits.