18QHTF21-123.456789-PD

Overview

The 18QHTF21-123.456789-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 123.456789 MHz and utilizes LVCMOS output logic. 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, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• Provides stable clock signals via LVCMOS output interface
• Integrates standby mode to reduce power consumption during idle periods
• Designed for surface-mount assembly with leadless SMD packaging

Applications

• Digital signal processing systems requiring precise clock synchronization
• Communication equipment utilizing high-frequency timing references
• Embedded systems needing low-voltage power-down capabilities

Procurement Notes

Verify the exact frequency specification of 123.456789 MHz against system requirements before ordering. Confirm that the 1.8V supply voltage aligns with the target circuit design. Ensure compatibility with the 4-SMD No Lead footprint during PCB layout. Check for any specific handling instructions related to the leadless package type.

Selection Notes

Select this component when a specific frequency of 123.456789 MHz is mandatory for the application. Consider the LVCMOS output level if interfacing with standard digital logic families. Evaluate the need for the standby feature if power efficiency is a critical design constraint. Verify that the operating temperature range meets environmental conditions.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal oscillators. The manufacturer has decades of experience in frequency control products. This specific model represents a standard XO variant within their portfolio, distinguished by its unique frequency and low-voltage operation.

Replacement Considerations

Direct substitutes must match the 123.456789 MHz frequency, LVCMOS output, and 1.8V supply. Verify pinout compatibility for the 4-SMD No Lead package. Cross-reference with other Mercury models in the same series if available.