18QHTF21-11.985-OE

Overview

The 18QHTF21-11.985-OE is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 11.985 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and features an Enable/Disable control function for power management. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• Generates stable clock signals using LVCMOS output logic
• Supports active enable and disable control states
• Designed for low-voltage 1.8V operation
• Utilizes lead-free surface-mount packaging

Applications

• General-purpose digital circuit timing
• Microcontroller clock sources
• Communication interface synchronization
• Embedded system oscillators

Procurement Notes

Verify the specific ordering suffix to confirm the exact output logic level and enable/disable functionality, as variations exist within the 18QHTF21 series. Ensure compatibility with the target 1.8V supply rail and check footprint dimensions against the PCB layout. Confirm that the LVCMOS output swing meets the input requirements of the receiving component. Cross-reference the datasheet for thermal and electrical specifications before finalizing the bill of materials.

Selection Notes

Select this component when a fixed 11.985 MHz frequency is required with LVCMOS outputs. Consider the 1.8V supply constraint and the need for software-controllable enable/disable features. Evaluate the 4-SMD package size against available board space. Compare against other frequencies in the series if the exact 11.985 MHz value is not strictly necessary, allowing for standard alternatives like 12 MHz or 11.0592 MHz if jitter or phase noise specs differ significantly.

Part Context

This part belongs to the 18QHTF21 series of standard crystal oscillators from Mercury Electronic. The series offers various frequencies and output types, typically packaged in small SMD footprints. Mercury Electronic specializes in quartz crystals and frequency control products, providing components for consumer electronics, telecommunications, and industrial applications. This specific model represents a standard XO variant rather than a temperature-compensated or voltage-controlled type.

Replacement Considerations

Direct replacements must match the 11.985 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pinout compatibility and enable/disable signal polarity. Other manufacturers may offer equivalent parts under different part numbers; ensure electrical parameters such as load capacitance and drive strength are identical.