18QHTF21-49.5733-PD

Overview

The 18QHTF21-49.5733-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a nominal frequency of 49.5733 MHz and utilizes LVCMOS output logic levels. The device is designed for low-power applications, featuring a supply voltage range of 1.8V and an integrated standby or power-down function to minimize energy consumption during idle periods. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm, suitable for surface-mount assembly on printed circuit boards.

Feature Summary

• Supports LVCMOS output signal compatibility
• Includes standby or power-down functionality for reduced power consumption
• Utilizes a compact 4-SMD no-lead surface mount package

Applications

• Digital signal processing systems requiring precise clock timing
• Communication equipment utilizing 49.5733 MHz reference frequencies
• Portable electronic devices where low power consumption is critical

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Ensure the PCB footprint matches the 4-SMD, No Lead package dimensions to prevent soldering defects. Check for RoHS compliance status if environmental regulations apply to the final product assembly.

Selection Notes

Select this component when a stable 49.5733 MHz clock source is required for digital circuits. The choice is driven by the need for low-voltage operation at 1.8V and the inclusion of a power-down feature for battery-efficient designs. The small form factor makes it appropriate for space-constrained layouts. Compare against other Mercury oscillators if different frequencies or voltage levels are needed.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronic Ind. Co., Ltd, a supplier specializing in quartz crystals, oscillators, and filters. The series typically offers various frequencies and package options. This specific model represents a standard XO variant within their portfolio, distinct from TCXO or VCTCXO models which offer higher stability but different cost and performance profiles.

Replacement Considerations

Direct substitutes must match the 49.5733 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility and electrical characteristics such as phase noise and jitter specifications. Cross-reference with other manufacturers offering similar surface-mount oscillators if Mercury stock is unavailable.