18QHTF21-8.004-PD

Overview

The 18QHTF21-8.004-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 8.004 MHz and utilizes LVCMOS output logic. The device requires a supply voltage of 1.8V and features a power-down (standby) control function to reduce consumption. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. The component is designed for applications requiring precise timing signals in space-constrained electronic systems.

Feature Summary

• Integrates LVCMOS output logic for direct interfacing with digital circuits
• Includes standby mode capability via power-down control pin
• Utilizes a leadless surface-mount package for automated assembly

Applications

• Battery-powered portable devices
• Communication equipment requiring stable clock sources
• Embedded systems utilizing low-voltage microcontrollers

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply rail is stable and within the specified operating range. Ensure the PCB footprint matches the 2.0x1.6mm SMD no-lead package dimensions to prevent soldering defects during assembly.

Selection Notes

Select this component when a low-profile, low-voltage oscillator is required for high-frequency timing applications. Consider the power-down feature if energy efficiency is critical for battery-operated products. Evaluate the thermal performance and mechanical stability requirements to ensure the small form factor meets the environmental constraints of the final assembly.

Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronic. The series offers various frequencies and supply voltages, catering to diverse consumer electronics and industrial applications. The 'PD' suffix indicates the inclusion of a power-down control feature, distinguishing it from continuous-output variants within the same physical package family.

Replacement Considerations

Direct substitutes include other 8.004 MHz LVCMOS oscillators in 2.0x1.6mm packages with 1.8V operation. Verify pin compatibility and electrical specifications such as jitter and phase noise before swapping. Alternative parts from different manufacturers may require layout adjustments due to slight dimensional variances.