18QHTF21-51.840-OE

Overview

The 18QHTF21-51.840-OE is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fundamental frequency of 51.84 MHz and utilizes LVCMOS output logic levels. The device is designed for operation with a supply voltage of 1.8V and features an integrated enable/disable control function for power management flexibility. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly processes. This component serves as a precise clock source for digital circuits requiring stable frequency generation within specified operating temperature ranges.

Feature Summary

• Provides stable 51.84 MHz clock signal via LVCMOS interface
• Supports low-voltage 1.8V operation with enable/disable control
• Utilizes compact 4-SMD no-lead surface mount packaging

Applications

• Digital system clock generation
• Microprocessor timing references
• Communication interface synchronization

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the enable/disable pin functionality is utilized correctly in your schematic to manage power states. Cross-reference the 4-SMD package dimensions with your PCB footprint library to guarantee mechanical compatibility during assembly.

Selection Notes

Select this oscillator when a fixed 51.84 MHz frequency is required for synchronous digital systems. The LVCMOS output ensures compatibility with standard logic families operating at 1.8V. Consider the enable/disable feature if power conservation is critical during idle periods. The small form factor makes it suitable for space-constrained designs where larger packages cannot fit. Validate thermal performance within the intended operating environment.

Part Context

This component belongs to Mercury Electronics' series of quartz-based oscillators, leveraging the manufacturer's expertise in frequency control products established since 1973. The 18QHTF21 series represents their standard XO offerings, focusing on reliability and precision for industrial and commercial applications. Mercury Electronics is recognized as a pioneer in Taiwan's quartz industry, providing foundational frequency components for global electronics manufacturing.

Replacement Considerations

Direct substitutes include other 51.84 MHz LVCMOS oscillators in 4-SMD packages from compatible manufacturers. Verify equivalent electrical parameters such as supply voltage, output swing, and phase noise specifications. Ensure the replacement supports the same enable/disable control mechanism if present in the original design. Check dimensional tolerances to maintain board layout integrity without rework.