18QHTF21-78.1758-PD

Overview

The 18QHTF21-78.1758-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd, operating at a frequency of 78.1758 MHz. It utilizes LVCMOS output logic and functions with a supply voltage of 1.8V. The component features a standby mode for power down capabilities. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6mm.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby functionality to enable power down operations
• Utilizes a leadless SMD package design for surface mount applications

Applications

• General purpose clock signal generation in electronic circuits
• Timing reference sources for digital systems requiring 1.8V operation
• Embedded devices utilizing standard crystal oscillator interfaces

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 4-SMD no-lead package footprint matches the PCB layout specifications to guarantee proper soldering and mechanical stability during assembly processes.

Selection Notes

Select this component when a precise 78.1758 MHz timing source is required within a low-voltage 1.8V environment. Consider the LVCMOS output compatibility with downstream logic families. Evaluate the physical space constraints to accommodate the small 2.0x1.6mm form factor. Assess power consumption needs where standby modes are beneficial for energy efficiency in portable or battery-operated designs.

Part Context

This model belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal frequency control products. The manufacturer has decades of experience in Taiwan producing such components. This series typically offers standard oscillators designed for reliable performance in various consumer and industrial electronics applications requiring stable clock signals.

Replacement Considerations

Direct substitutes include other 18QHTF21 series variants with identical pinout and electrical characteristics but different frequencies, such as 18QHTF21-96.768-PD or 18QHTF21-6.000-PD, provided the frequency difference is acceptable for the application.