18QHTF21-49.4067-PD

Overview

The 18QHTF21-49.4067-PD is a surface-mount crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a standard frequency of 49.4067 MHz with a frequency stability of ±50 ppm. The device utilizes an LVCMOS output function and supports a supply voltage range including 1.8V. It features a compact 4-SMD, No Lead package with dimensions of 2.00mm x 1.60mm. The maximum current consumption is specified as 24mA. The component includes a power-down feature for standby operation and is compliant with RoHS standards.

Feature Summary

• Surface-mount LVCMOS crystal oscillator design
• Integrated power-down functionality for standby mode
• Compact 4-SMD no-lead package configuration

Applications

• Digital signal processing timing references
• Communication equipment clock sources
• Embedded system microcontroller interfaces

Procurement Notes

Verify the specific operating voltage requirements against the target circuit design to ensure compatibility with the 1.8V specification. Confirm that the ±50 ppm frequency stability meets the application's timing tolerance needs. Ensure the PCB footprint matches the 2.00mm x 1.60mm SMD package dimensions. Check for any specific reflow soldering profile recommendations provided in the official datasheet to maintain component integrity during assembly.

Selection Notes

Select this component when a precise 49.4067 MHz clock signal is required in space-constrained designs. The low current draw of 24mA makes it suitable for battery-powered or energy-efficient applications. The inclusion of a power-down pin allows for dynamic power management. Consider the ±50 ppm stability if high-precision frequency synthesis is not critical. The surface-mount format facilitates automated assembly processes.

Part Context

This part belongs to the Mercury Electronics 18QHTF series of surface-mount oscillators. The series offers various frequencies and package sizes tailored for modern electronics. Mercury Electronics specializes in quartz crystals, oscillators, and filters. This specific model provides a standardized solution for timing applications requiring small form factors and reliable performance.

Replacement Considerations

Cross-reference with other 49.4067 MHz LVCMOS oscillators in the 4-SMD 2x1.6mm package. Verify electrical compatibility regarding supply voltage, current consumption, and load capacitance. Ensure mechanical footprint alignment for direct replacement. Check frequency stability specifications to avoid performance degradation in sensitive timing circuits.