18QHTF21-8.0174-PD

Overview

The 18QHTF21-8.0174-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 8.0174 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a power-down function for standby mode control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes power-down functionality to enable standby mode
• Utilizes a leadless surface-mount package for space-constrained designs

Applications

• General-purpose timing circuits requiring precise clock signals
• Embedded systems utilizing low-voltage digital interfaces
• Portable electronic devices necessitating compact oscillator solutions

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's power rails. Ensure the PCB footprint matches the 2.0 x 1.6 mm SMD package dimensions. Check for any specific handling instructions related to the leadless package type during assembly processes.

Selection Notes

Select this component when a low-profile, leadless oscillator is required for 1.8V logic systems. Consider the 8.0174 MHz frequency specifically for applications needing this exact timing reference. Evaluate the power-down feature if energy efficiency in standby states is a priority. Compare physical dimensions against available board space constraints.

Part Context

This part belongs to the QHTF21 series from Mercury Electronics, which focuses on small-form-factor oscillators. The series typically offers various frequencies within a standardized 2.0 x 1.6 mm package. The 'PD' suffix indicates the inclusion of a power-down pin or function, distinguishing it from basic continuous-operation variants in the same family.

Replacement Considerations

Direct substitutes must match the 8.0174 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 leadless packages to ensure mechanical fit and electrical equivalence.