18QHTF21-77.700-OE

Overview

The 18QHTF21-77.700-OE is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 77.7 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 3.3V and features an enable/disable control function. It is housed in a compact 4-SMD, No Lead package with SMD2520-4P dimensions. This component is suitable for applications requiring precise clock signals within specified temperature ranges.

Feature Summary

• Provides stable 77.7 MHz clock signal generation
• Supports low voltage CMOS logic interface
• Includes hardware enable and disable functionality

Applications

• Digital signal processing systems
• Communication equipment clocking
• Embedded system timing references

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against your circuit design before procurement. Confirm that the 3.3V supply voltage aligns with your power management architecture. Ensure the SMD2520 footprint matches your PCB layout constraints to guarantee proper soldering and mechanical stability during assembly processes.

Selection Notes

Select this model when a 77.7 MHz frequency is required with LVCMOS compatibility. Consider the 3.3V supply constraint and the need for an enable pin. Evaluate the SMD2520 package size against available board space. Compare performance metrics such as phase noise and stability if available in official documentation to ensure suitability for high-speed digital applications.

Part Context

This part belongs to the 18QHTF series of surface mount crystal oscillators from Mercury Electronics. The series typically offers various frequencies and voltage options. The 18QHTF21 variant specifically denotes the 1.8V or 3.3V standard XO family depending on the suffix configuration, providing a compact solution for modern electronic devices requiring reliable timing sources.

Replacement Considerations

Check Mercury Electronics datasheets for direct replacements with identical pinouts and electrical characteristics. Verify frequency tolerance and package dimensions for cross-compatibility. Ensure substitute components support the same LVCMOS output and enable/disable functionality without requiring circuit redesign.