18QHTF21-77.7776-PD

Overview

The 18QHTF21-77.7776-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 77.7776 MHz with an LVCMOS output logic type. The device requires a supply voltage of 1.8V and features a standby function for power down control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. The component supports an operating temperature range from -40°C to 85°C and offers a frequency stability of ±50ppm.

Feature Summary

• Supports low-voltage operation at 1.8V with LVCMOS output compatibility
• Includes standby functionality for effective power management
• Utilizes a small form factor 4-SMD no-lead package design

Applications

• General electronic timing circuits requiring precise clock signals
• Portable devices necessitating low-power consumption solutions
• Embedded systems utilizing LVCMOS interface standards

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 4-SMD package footprint matches your PCB layout constraints. Check for any specific handling instructions regarding the no-lead package during assembly processes.

Selection Notes

Select this component when a stable 77.7776 MHz reference is required within a tight space constraint. Consider the ±50ppm stability for applications sensitive to minor frequency drift. The standby feature makes it suitable for battery-operated equipment where power efficiency is critical. Evaluate the -40°C to 85°C range against your environmental operating conditions.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series typically includes various frequencies and voltage options. The 'PD' suffix indicates the inclusion of a power-down pin or function. These components are designed for high-volume manufacturing and integration into modern consumer electronics.

Replacement Considerations

Consult official manufacturer substitution lists for direct equivalents. Verify electrical parameters such as voltage, current, and pinout compatibility. Ensure mechanical dimensions match the existing footprint. Cross-reference frequency stability and temperature ranges to maintain system performance.