18QHTF21-122.500-PD

Overview

The 18QHTF21-122.500-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 122.5 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and features a power-down function for standby mode control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6mm. The component is designed for applications requiring precise timing signals within a small form factor.

Feature Summary

• Supports low-voltage operation at 1.8V
• Includes power-down capability for energy management
• Utilizes LVCMOS output logic levels
• Available in a compact surface-mount package

Applications

• Battery-powered portable devices
• General-purpose digital clocking systems
• Embedded timing circuits

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply rail is stable and within the specified operating range to ensure reliable oscillator performance. Ensure the PCB footprint matches the 4-SMD No Lead package dimensions precisely to avoid assembly issues.

Selection Notes

Select this component when a 122.5 MHz clock signal is required with minimal power consumption. The integrated power-down feature makes it suitable for systems needing active standby modes. Consider the 1.8V logic compatibility with your target microcontroller or FPGA interface to ensure signal integrity without additional level shifting.

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 quartz industry. This series typically offers various standard frequencies packaged in small SMD formats for modern electronic applications.

Replacement Considerations

Direct substitutes include other 122.5 MHz LVCMOS oscillators in 4-SMD packages with 1.8V operation. Verify pinout compatibility and thermal characteristics when replacing. Cross-reference with similar Mercury models like 18QHTF21-51.200-PD if frequency differences are acceptable.