18QHTF21-79.388-PD

Overview

The 18QHTF21-79.388-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 79.388 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a Standby (Power Down) control function. It is housed in a compact 4-SMD, No Lead package, suitable 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 package design

Applications

• Digital signal processing circuits
• Communication equipment timing
• Embedded system clock generation

Procurement Notes

Verify the exact frequency tolerance and operating temperature range against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target circuit design. Ensure the 4-SMD no lead package footprint matches the PCB layout requirements to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a standard LVCMOS interface. The integrated power-down feature makes it suitable for battery-powered or energy-efficient designs. Verify that the 79.388 MHz frequency meets the specific system clock requirements and that the small form factor fits within the available board space constraints.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz-based frequency control products. The manufacturer has decades of experience in Taiwan producing crystals and oscillators. This series typically offers standard performance levels for general-purpose timing applications in consumer and industrial electronics.

Replacement Considerations

Check for direct substitutes with identical 79.388 MHz frequency, 1.8V supply, and LVCMOS output. Ensure compatible package dimensions and pinout configurations. Verify equivalent electrical specifications such as phase noise and load capacitance if critical for the application.