18QHTF21-78.6432-OE

Overview

The 18QHTF21-78.6432-OE is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 78.6432 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and features an enable/disable control function. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications requiring precise timing signals.

Feature Summary

• Supports active low or high enable/disable functionality for power management
• Provides stable LVCMOS output signals for digital circuit synchronization
• Utilizes a leadless SMD package for automated surface-mount assembly

Applications

• Digital signal processing systems requiring precise clock references
• Communication equipment utilizing specific baud rate frequencies
• Embedded systems with low-voltage logic requirements

Procurement Notes

Verify the exact frequency tolerance and load capacitance specifications against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Ensure the enable pin logic polarity matches the controlling microcontroller's output capabilities to prevent unintended oscillation states during operation.

Selection Notes

Select this component when a specific 78.6432 MHz frequency is required for data transmission standards. Consider the 1.8V operating voltage constraint for compatibility with modern low-power logic families. Evaluate the 4-SMD footprint dimensions against available PCB real estate constraints. Verify thermal performance requirements if the application involves high ambient temperatures.

Part Context

This part belongs to the Mercury Electronics XO series, which focuses on standard frequency generation components. The manufacturer has specialized in quartz-based frequency control products since 1973. This specific model represents their capability to produce precise oscillators for niche frequency applications within the consumer and industrial electronics sectors.

Replacement Considerations

Direct substitutes must match the 78.6432 MHz frequency, 1.8V supply, and LVCMOS output type. Verify pinout compatibility for the 4-SMD no-lead package. Check equivalent manufacturers such as Epson or SiTime for similar form-factor alternatives if supply chain constraints exist.