18QHTF21-74.1782-PD

Overview

The 18QHTF21-74.1782-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 74.1782 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby mode with power-down capability. It is housed in a compact 4-SMD, no-lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• LVCMOS output logic for digital interface compatibility
• Integrated standby function with power-down control
• Compact 4-SMD no-lead surface-mount package design

Applications

• General-purpose digital timing circuits
• Communication equipment clock generation
• Consumer electronics signal processing

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before procurement. Ensure the 1.8V supply voltage aligns with the target system's power rails. Confirm that the 4-SMD no-lead package dimensions fit the designated PCB footprint. Check for any specific handling instructions regarding electrostatic discharge sensitivity during assembly.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside LVCMOS outputs. The integrated power-down feature makes it suitable for battery-operated devices needing standby modes. Consider the small form factor of the 4-SMD package for space-constrained designs. Validate that the 74.1782 MHz frequency matches the exact system clock requirement without need for external dividers.

Part Context

This part belongs to the Mercury Electronics 18QHTF21 series of standard XO oscillators. The series typically offers various frequencies within a similar voltage and package constraint. The 'PD' suffix indicates the inclusion of a power-down pin or functionality, distinguishing it from basic continuous-operation variants in the same family.

Replacement Considerations

Direct substitutes must match the 74.1782 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility if replacing with different manufacturers. Ensure equivalent frequency stability and phase noise specifications are met for critical timing applications.