18QHTF21-57.849-PD

Overview

The 18QHTF21-57.849-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 57.849 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down function to manage energy consumption. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports low-voltage operation at 1.8V
• Includes standby and power-down functionality
• Provides LVCMOS output signal compatibility

Applications

• General clock generation for digital circuits
• Embedded systems requiring precise timing
• Portable electronics due to low voltage requirements

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD no-lead package footprint matches your PCB layout constraints. Check for any specific reflow soldering profile recommendations provided by the manufacturer to ensure reliable assembly.

Selection Notes

Select this component when a precise 57.849 MHz clock source is required in space-constrained applications. The LVCMOS interface ensures compatibility with standard logic families. The integrated power-down feature makes it suitable for battery-operated devices where power efficiency is critical. Verify that the operating temperature range meets your environmental specifications.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronic, which offers various frequencies within a small 2.0x1.6mm package. The series is characterized by its low voltage operation and standard XO performance. The '-PD' suffix indicates the inclusion of power-down capabilities, distinguishing it from basic versions without this feature.

Replacement Considerations

Direct replacements must match the 57.849 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility if substituting with other manufacturers. Ensure equivalent electrical parameters such as phase noise and jitter are acceptable for the application.