18QHTF21-25.78125-PD

Oscillators Overview

The 18QHTF21-25.78125-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 25.78125 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down function to conserve energy during inactive periods. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Oscillators Feature Summary

• Supports low-voltage operation at 1.8V
• Includes standby and power-down functionality
• Utilizes LVCMOS output logic

Oscillators Applications

• General clock signal generation
• Digital circuit timing reference
• Embedded system clock sources

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target system design. Ensure the 4-SMD no-lead package footprint matches the PCB layout constraints. Check for any specific handling instructions regarding electrostatic discharge sensitivity.

Oscillators Selection Notes

Select this component when a precise 25.78125 MHz clock source is required for low-power applications. The 1.8V operating voltage makes it suitable for modern portable and battery-operated devices. The small 2.0x1.6mm package allows for high-density board layouts. Consider the standby feature if power management is a critical design constraint.

Oscillators Part Context

This part belongs to the QHTF series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequencies and voltage options within a standardized small form factor. The 'PD' suffix indicates the inclusion of a power-down control pin, distinguishing it from continuously running variants in the same family.

Oscillators Replacement Considerations

Direct replacements must match the 25.78125 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pin compatibility and electrical characteristics with alternative manufacturers before substitution.