18QHTF21-121.495-PD

Overview

The 18QHTF21-121.495-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 121.495 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and features a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications. This component is engineered to provide stable clock signals within specified operating temperature ranges, suitable for digital circuit timing requirements.

Feature Summary

• Supports standby mode for power reduction
• Utilizes LVCMOS output interface
• Compact surface-mount package design

Applications

• Digital system clock generation
• Communication equipment timing
• Embedded processor clock sources

Procurement Notes

Verify the exact frequency tolerance and load capacitance specifications against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Ensure the 4-SMD no-lead package footprint matches the PCB layout design. Check for any specific reflow soldering profile recommendations provided by the manufacturer to ensure reliability during assembly processes.

Selection Notes

Select this component when a precise 121.495 MHz clock signal is required with low power consumption capabilities. The LVCMOS output is suitable for standard logic interfaces. Consider the operating temperature range and size constraints of the application. Compare performance metrics such as phase noise and stability if available in the technical documentation to ensure compatibility with sensitive circuit designs.

Part Context

This part belongs to the 18QHTF21 series of crystal oscillators from Mercury Electronics. The series typically offers various frequencies with standardized packaging. Mercury Electronics is a established manufacturer of frequency control products. The PD suffix likely indicates a specific tape and reel packaging option or variant within their product line, distinct from bulk packaging options.

Replacement Considerations

Direct substitutes must match the 121.495 MHz frequency, LVCMOS output, and 1.8V supply voltage. Verify pinout compatibility for the 4-SMD no-lead package. Cross-reference electrical characteristics such as current consumption and startup time. Consult the manufacturer's cross-reference list for approved alternative part numbers.