18QHTF21-19.998-PD

Oscillators Overview

The 18QHTF21-19.998-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 19.998 MHz and utilizes LVCMOS output logic levels. The device is designed for a supply voltage of 1.8V and includes standby (power down) functionality to reduce power consumption when not in use. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly on printed circuit boards.

Oscillators Feature Summary

• LVCMOS output interface for digital signal compatibility
• Integrated standby mode for power management
• Compact surface-mount package design

Oscillators Applications

• General purpose clock generation in embedded systems
• Timing reference for microcontrollers
• Data communication interfaces requiring precise clock signals

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target application's specifications before procurement. Confirm that the 1.8V supply voltage aligns with the system power rails. Ensure the 4-SMD no-lead package footprint matches the PCB layout design to guarantee proper soldering and mechanical stability during assembly processes.

Oscillators Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside standard LVCMOS signaling. The inclusion of a power-down feature makes it suitable for battery-operated devices or systems requiring active power management. Consider the 19.998 MHz frequency specifically if it matches the necessary baud rate or clock division requirements of the target digital circuitry.

Oscillators Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which focuses on low-voltage crystal oscillators. The series typically offers various frequencies and packaging options. The 'PD' suffix indicates the presence of a power-down control pin, distinguishing it from continuous-operation variants within the same family.

Oscillators Replacement Considerations

Direct substitutes must match the 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify frequency accuracy and phase noise specifications against the original datasheet. Cross-reference with other manufacturers offering similar low-profile oscillators with enable/disable functionality.