18QHTF21-72.1955-PD

Overview

The 18QHTF21-72.1955-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 72.1955 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a Standby (Power Down) function controlled via an Enable/Disable pin. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• LVCMOS output logic for digital interface compatibility
• Integrated standby mode for power management
• Compact 4-SMD no-lead surface mount package

Applications

• General purpose clock signal generation
• Embedded systems timing reference
• Digital circuit synchronization

Procurement Notes

Verify the specific ordering suffix against official Mercury Electronics documentation to confirm the exact electrical characteristics and package dimensions. Ensure the selected variant matches the required supply voltage and output logic levels for the target application. Cross-reference the part number with authorized distributors to confirm availability and authenticity before placing orders.

Selection Notes

Select this component when a 72.1955 MHz clock source with LVCMOS outputs is required. Consider the 1.8V supply constraint and the need for a standby control feature. Evaluate the 4-SMD package size against board space limitations. Confirm that the operating temperature range meets the environmental requirements of the final assembly.

Part Context

This part belongs to the Mercury Electronics SMD oscillator series, which includes various frequencies and package types. The 'PD' suffix typically indicates a specific pin configuration or functional option related to the standby capability. It is distinct from other variants like the '-OE' suffix, which may denote different enable logic or performance specifications.

Replacement Considerations

Direct substitutes must match the 72.1955 MHz frequency, LVCMOS output, 1.8V supply, and 4-SMD package. Verify pinout compatibility and electrical parameters such as jitter and phase noise. Consult manufacturer cross-reference lists for approved alternatives.