18QHTF21-81.750-PD

Overview

The 18QHTF21-81.750-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 81.75 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a power-down (standby) control function. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm x 1.6mm.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby mode via power-down control pin
• Utilizes surface-mount technology for automated assembly

Applications

• General clock generation for embedded systems
• Timing reference for microprocessors
• Data communication interfaces requiring precise clock signals

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the system power rails. Ensure the PCB footprint matches the 2.0x1.6mm SMD package dimensions to prevent soldering defects during assembly.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a small form factor. The LVCMOS output is suitable for standard digital logic families. Consider the power-down feature if energy efficiency during idle states is a priority for the application design.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in frequency control products. The series offers various frequencies within a standardized 2.0x1.6mm package, allowing for consistent board layout across different timing requirements while maintaining low profile and power consumption characteristics.

Replacement Considerations

Direct substitutes must match the 81.75 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify that any alternative component supports the same power-down functionality and meets identical dimensional constraints for footprints.