18QHTF21-8.126984-PD

Overview

The 18QHTF21-8.126984-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 8.126984 MHz with an LVCMOS output logic level. The device functions on a 1.8V supply voltage and includes a standby (power down) control feature. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications requiring precise timing signals.

Feature Summary

• Standard XO configuration with LVCMOS output
• Integrated standby power down control
• Compact 4-SMD no lead surface mount package

Applications

• Digital clock signal generation
• Microcontroller system timing
• Communication interface synchronization

Procurement Notes

Verify the specific ordering suffix PD indicates the standby function against the official Mercury Electronics datasheet. Confirm the 1.8V supply requirement matches the target circuit design. Ensure the 4-SMD no lead footprint aligns with the PCB layout specifications to prevent assembly errors.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a standby capability. The LVCMOS output is suitable for direct interfacing with standard digital logic families. Consider the 4-SMD package size constraints during mechanical design integration.

Part Context

This part belongs to the Mercury Electronics 18QHTF series of surface-mount oscillators. The series offers various frequencies and supply voltages. The PD suffix specifically denotes the power-down functionality, distinguishing it from OE (enable/disable) variants within the same physical package family.

Replacement Considerations

Direct substitutes include other 18QHTF21 models with identical pinout and electrical characteristics but different frequencies or control suffixes such as OE. Verify frequency tolerance and load capacitance requirements before cross-referencing.