18QHTF21-21.8418-PD

Oscillators Overview

The 18QHTF21-21.8418-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 21.8418 MHz and utilizes LVCMOS output logic levels. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications requiring precise timing signals.

Oscillators Feature Summary

• LVCMOS output interface for digital logic compatibility
• Integrated standby mode for power reduction
• Compact surface-mount form factor

Oscillators Applications

• General purpose clock generation
• Digital signal processing systems
• Communication equipment timing

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the system design specifications before procurement. Ensure the 1.8V supply rail stability meets the oscillator's operational limits. Confirm that the 4-SMD no-lead package dimensions align with the PCB footprint guidelines to prevent assembly issues during manufacturing.

Oscillators Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside standard LVCMOS signaling. The choice depends on the need for a power-down feature to manage idle states. Consider the physical size constraints of the 4-SMD package relative to available board space. Validate that the 21.8418 MHz frequency matches the target system clock input requirements precisely.

Oscillators Part Context

This part belongs to the 18QHTF21 series of standard oscillators from Mercury Electronics. The series offers various frequencies within the LVCMOS format. The 'PD' suffix indicates the inclusion of a power-down control pin. This family targets applications needing reliable timing with minimal power consumption in portable or battery-operated devices.

Oscillators Replacement Considerations

Direct substitutes include other 18QHTF21 variants with identical pinout and electrical characteristics but different frequencies, such as 18QHTF21-25.000-PD, provided the system clock requirement allows adjustment. Cross-brand replacements require matching LVCMOS output, 1.8V supply, and 4-SMD package dimensions.