18QHTF21-49.104-PD

Overview

The 18QHTF21-49.104-PD is a standard frequency LVCMOS crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 49.104 MHz with a supply voltage of 1.8V. The device features a power-down function for standby mode and utilizes a 4-SMD, no-lead package configuration.

Feature Summary

• Generates a precise 49.104 MHz clock signal using LVCMOS output logic
• Supports low-power operation through an integrated standby power-down mode
• Designed for surface-mount assembly in compact electronic circuits

Applications

• Digital signal processing systems requiring stable timing references
• Communication equipment utilizing LVCMOS interface standards
• Embedded control units needing low-voltage clock sources

Procurement Notes

Verify the exact frequency tolerance and load capacitance specifications against the official datasheet before integration. Confirm that the 1.8V supply requirement aligns with the target circuit design. Ensure the 4-SMD no-lead package footprint matches the PCB layout constraints to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this component when a low-voltage 1.8V supply is available and a surface-mount form factor is required. The LVCMOS output is suitable for direct interfacing with compatible digital logic families. Consider the power-down feature if energy efficiency during idle periods is a critical system requirement compared to continuous oscillation alternatives.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystals and oscillators. The manufacturer has produced frequency control products since 1973, offering both surface mount and thru-hole options. This specific model represents their capability in providing compact, low-voltage timing solutions for modern electronics.

Replacement Considerations

Cross-reference with other 49.104 MHz LVCMOS oscillators in the 4-SMD no-lead package. Verify compatibility regarding pinout definitions, operating voltage ranges, and thermal characteristics to ensure functional equivalence without redesigning the host circuit board.