18QHTF21-74.125-PD

Overview

The 18QHTF21-74.125-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 74.125 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 during inactive periods. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm by 1.6mm. This surface-mount configuration facilitates automated assembly processes while maintaining a low profile suitable for space-constrained electronic designs.

Feature Summary

• Supports LVCMOS output logic for digital signal interfacing
• Includes standby mode capability for power management
• Utilizes a leadless surface-mount package design

Applications

• Digital clock generation in embedded systems
• Timing reference for communication interfaces
• Power supply monitoring circuits requiring precise timing

Procurement Notes

Verify the specific ordering suffix and frequency tolerance requirements against project specifications before procurement. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Ensure the 4-SMD no-lead package footprint matches the PCB layout constraints. Check for any specific handling instructions related to the surface-mount technology used in this component series.

Selection Notes

Select this model when a 74.125 MHz clock source is required with low-voltage operation. The LVCMOS interface ensures compatibility with standard digital logic families. Consider the physical dimensions of the 2.0x1.6mm package for board space optimization. The inclusion of a power-down feature makes it suitable for battery-operated devices where standby current reduction is critical for extending operational life.

Part Context

This oscillator belongs to the 18QHTF21 series from Mercury Electronics, which focuses on small-form-factor timing solutions. The manufacturer has extensive experience in quartz crystal production. The series typically offers various frequency options within a standardized package outline. This specific part represents one of the many frequency variants available in the lineup, sharing common electrical characteristics and mechanical attributes with other models in the family.

Replacement Considerations

Direct substitutes must match the 74.125 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility and thermal characteristics. Cross-reference with other manufacturers offering similar surface-mount oscillators if availability is a concern.