18QHTF21-64.400-PD

Overview

The 18QHTF21-64.400-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 64.4 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and includes a standby or power-down function to manage energy consumption efficiently. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm by 1.6mm. This component serves as a precise clock source for digital circuits requiring low voltage operation and small form factor integration.

Feature Summary

• Supports LVCMOS output logic for direct interface with digital components
• Includes standby mode capability for power management
• Utilizes a lead-free surface-mount package design

Applications

• General purpose clock generation for embedded systems
• Timing reference for low-voltage digital logic circuits
• Portable electronic devices requiring compact oscillators

Procurement Notes

Verify the specific frequency tolerance and operating temperature range against the official datasheet before procurement. Ensure the 1.8V supply voltage aligns with the target circuit design. Confirm that the 4-SMD no-lead package footprint matches the PCB layout requirements. Check for any specific handling instructions related to the lead-free construction during assembly processes.

Selection Notes

Select this model when a 64.4 MHz clock signal is required with a 1.8V supply constraint. Consider the LVCMOS output compatibility with downstream logic families. Evaluate the physical space constraints to ensure the 2.0x1.6mm package fits the design. Assess if the standby feature provides necessary power savings for the application environment compared to continuous operation alternatives.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz-based timing solutions. The manufacturer has decades of experience in producing crystals and oscillators. This series typically offers standard performance levels suitable for general consumer and industrial electronics. The 'PD' suffix indicates the inclusion of power-down functionality within the device architecture.

Replacement Considerations

Direct substitutes must match the 64.4 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility and electrical characteristics such as jitter and phase noise. Cross-reference with other manufacturers offering similar surface-mount oscillators with identical form factors and voltage levels.