18QHTF21-71.901-PD

Overview

The 18QHTF21-71.901-PD is a crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a frequency of 171.925 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 3.3V and features a power-down function for standby mode control. It is housed in a compact 4-SMD, No Lead package with dimensions of 3.2 x 2.5 mm. The component is designed for standard clock applications requiring precise timing signals.

Feature Summary

• Supports low-voltage CMOS output logic levels
• Includes power-down capability for energy management
• Compact surface-mount package design

Applications

• General purpose clock signal generation
• Digital system timing references
• Communication equipment synchronization

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure the 3.3V supply rail stability meets the oscillator's operational specifications. Confirm that the PCB footprint matches the 3.2x2.5mm SMD package dimensions to avoid assembly issues during manufacturing.

Selection Notes

Select this component when a 171.925 MHz clock source is required with LVCMOS compatibility. Consider the 3.3V operating voltage and the need for a power-down feature in your system architecture. Evaluate the physical space constraints to ensure the small SMD form factor fits within the designated area on the printed circuit board layout.

Part Context

This part belongs to the 18QHTF21 series of crystal oscillators from Mercury Electronics. The series offers various frequencies and voltage options. The -PD suffix indicates the inclusion of a power-down pin or function, allowing for active standby modes to reduce power consumption during idle periods compared to continuously running oscillators.

Replacement Considerations

Check datasheets for alternative models offering identical 171.925 MHz frequency and 3.3V LVCMOS outputs. Verify package compatibility and pinout alignment to ensure direct substitution without redesigning the PCB footprint or adjusting surrounding circuit components.