18QHTF21-114.775489-PD

Overview

The 18QHTF21-114.775489-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 114.775489 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm.

Feature Summary

• Supports low-voltage operation at 1.8V
• Includes standby mode capability
• Utilizes LVCMOS output interface

Applications

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

Procurement Notes

Verify the specific part number suffix against official manufacturer documentation to confirm exact electrical characteristics and packaging details. Ensure compatibility with the target board layout regarding the 4-SMD no-lead footprint. Cross-reference the frequency tolerance and operating temperature range requirements with the application environment before finalizing procurement decisions.

Selection Notes

Select this component when a precise 114.775489 MHz clock source is required within a 1.8V logic domain. The choice is driven by the need for a small 2.0x1.6mm form factor and the inclusion of a power-down feature. Confirm that the LVCMOS output swing matches the input requirements of the receiving digital components.

Part Context

This oscillator belongs to the Mercury 18QHTF series, designed for space-constrained applications. The series typically offers standard frequency options with low voltage compatibility. The 'PD' suffix indicates the inclusion of a power-down control pin, distinguishing it from continuously running variants.

Replacement Considerations

Direct replacements must match the 114.775489 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify that substitute parts support the same standby functionality and meet identical thermal specifications.