18QHTF21-77.800-PD

Overview

The 18QHTF21-77.800-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 77.8 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and supports a standby function for power down control. It is housed in a compact 4-SMD, No Lead package suitable for surface mount applications. The component is designed to operate within an extended temperature range of -40°C to 85°C, ensuring reliability in various electronic environments.

Feature Summary

• Supports standby mode for power management
• Utilizes LVCMOS output interface
• Compact 4-SMD no lead package design

Applications

• General purpose clock signal generation
• Embedded system timing references
• Consumer electronics circuit boards

Procurement Notes

Verify the specific frequency suffix against official Mercury Electronics documentation to ensure accuracy, as similar part numbers may denote different frequencies or tolerances. Confirm that the 1.8V supply requirement aligns with the target system's power rails. Ensure the 4-SMD no lead package footprint matches the PCB layout specifications before finalizing procurement orders to avoid assembly issues.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a standard LVCMOS interface. The choice is appropriate for designs needing a compact surface-mount form factor without exposed leads. Consider the operating temperature range of -40°C to 85°C to ensure suitability for the intended environmental conditions. Verify that the standby feature meets power consumption requirements during idle states.

Part Context

This oscillator belongs to the 18QHTF21 series from Mercury Electronic, which specializes in quartz frequency control products. The series includes various frequencies and packages, catering to diverse electronic needs. Mercury Electronic has been a pioneer in the crystal industry since 1973, providing reliable components such as TCXOs, VCXOs, and OCXOs alongside standard oscillators.

Replacement Considerations

Direct substitutes include other 18QHTF21 series variants with identical pinouts and electrical characteristics but different frequencies, such as 18QHTF21-77.780-PD, if frequency tolerance allows. Cross-reference with Mercury Electronics' official replacement guides for exact functional equivalents.