18QHTF21-49.250-PD

Overview

The 18QHTF21-49.250-PD is a quartz crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a standard frequency of 49.25 MHz and utilizes an LVCMOS output signal. The device is powered by a single 1.8V supply voltage and features a surface-mount package with dimensions of 2.0mm x 1.6mm in a 4-SMD, No Lead configuration. It includes a power-down (standby) function for energy management. The component is designed for timing applications requiring precise frequency control within electronic circuits.

Feature Summary

• Provides stable 49.25 MHz timing signals via LVCMOS interface
• Operates on a low 1.8V power supply for efficient consumption
• Incorporates a standby mode to reduce power usage when inactive

Applications

• Digital signal processing systems
• Communication equipment clocking
• Microcontroller timing references

Procurement Notes

Verify the specific operating temperature range 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 footprint matches your PCB layout constraints. Check for any RoHS compliance documentation if required by your manufacturing standards. Validate the part number suffix to ensure the correct package variant is ordered.

Selection Notes

Select this component when a compact surface-mount oscillator is needed for 49.25 MHz applications. Consider the 1.8V supply requirement and LVCMOS compatibility with your logic levels. Evaluate the need for a power-down feature to manage system power efficiency. Compare physical dimensions against available board space. Ensure the manufacturer's specifications meet your environmental and reliability standards.

Part Context

This part belongs to Mercury Electronics' family of surface-mount crystal oscillators. It is distinct from through-hole HC-49-US crystals listed in other contexts, offering a smaller 2.0x1.6mm footprint. The 'PD' suffix indicates the inclusion of a power-down control pin, differentiating it from standard continuous-output models. It serves as a direct replacement for similar 49.25 MHz SMD oscillators in modern electronics.

Replacement Considerations

Direct substitutes must match the 49.25 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pin-out compatibility for the power-down function. Cross-reference electrical characteristics such as phase noise and stability if critical to the application.