18QHTF21-66.400-PD

Overview

The 18QHTF21-66.400-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 66.4 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and includes a standby or power-down function to manage energy consumption. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• Integrates LVCMOS output logic for digital interface compatibility
• Supports standby mode with power-down capability
• Utilizes a leadless SMD package for surface mounting

Applications

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

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before procurement. Confirm that the 1.8V supply voltage aligns with the target circuit design. Ensure the 4-SMD no-lead package dimensions fit the PCB footprint constraints. Check for any specific handling instructions regarding electrostatic discharge protection during assembly.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside LVCMOS signaling standards. The inclusion of a power-down feature makes it suitable for battery-operated devices where standby current reduction is critical. Consider the physical size of the 4-SMD package relative to available board space. Validate that the 66.4 MHz frequency meets the system's clocking needs without additional dividers.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal frequency control products. The manufacturer has decades of experience in Taiwan's crystal industry. This series typically offers standard oscillators with various frequencies and voltage levels, catering to general-purpose electronic timing applications.

Replacement Considerations

Direct substitutes may include other 66.4 MHz LVCMOS oscillators in a 4-SMD no-lead package with 1.8V operation. Verify pinout compatibility and electrical specifications such as rise/fall times and duty cycle. Cross-reference with similar models from Mercury Electronics or other manufacturers offering equivalent form factors and performance metrics.