18QHTF21-39.500-PD

Oscillators Overview

The 18QHTF21-39.500-PD is a crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a frequency of 39.5 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications requiring precise timing signals.

Oscillators Feature Summary

• Supports low-voltage operation with integrated standby functionality
• Delivers standard LVCMOS output signals for digital interfacing
• Utilizes a leadless surface-mount package for automated assembly

Oscillators Applications

• General-purpose clock signal generation in electronic circuits
• Timing reference sources for digital systems requiring 39.5 MHz
• Embedded devices utilizing low-voltage logic interfaces

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD no-lead footprint matches your PCB layout constraints. Check manufacturer documentation for any specific reflow soldering profile recommendations to ensure reliable attachment during assembly processes.

Oscillators Selection Notes

Select this component when a fixed 39.5 MHz frequency is required rather than a programmable range. Consider the LVCMOS output compatibility with your downstream logic family. Evaluate the thermal performance within the specified operating temperature range. Compare the physical dimensions of the 4-SMD package against available board space to ensure proper fitment alongside other components.

Oscillators Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies within the same form factor. The series provides standardized timing solutions for consumer and industrial electronics. The 'PD' suffix typically indicates a specific packaging or tape-and-reel configuration offered by the distributor. This model represents a fixed-frequency option within the broader product line.

Oscillators Replacement Considerations

Direct substitutes must match the 39.5 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pinout compatibility if replacing with parts from different manufacturers. Ensure equivalent electrical specifications such as phase noise and stability are met. Generic oscillators may not fit without mechanical adaptation.