18QHTF21-121.212-PD

Overview

The 18QHTF21-121.212-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 121.212 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down function to manage energy consumption. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. This component is engineered for applications requiring precise clock signals within a small form factor.

Feature Summary

• Supports low-voltage operation at 1.8V
• Includes standby and power-down functionality
• Utilizes LVCMOS output logic interface
• Features a compact surface-mount package

Applications

• General digital system clocking
• Embedded processor timing references
• Communication module synchronization

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the PCB footprint matches the 2.0x1.6mm SMD package dimensions. Check for any specific reflow soldering profile recommendations provided by the manufacturer to ensure reliable assembly and long-term performance.

Selection Notes

Select this oscillator when a precise 121.212 MHz clock signal is required in space-constrained designs. The LVCMOS output is suitable for direct interfacing with standard CMOS logic families. Consider the power-down feature if energy efficiency during idle periods is a priority. Verify that the operating temperature range meets the environmental conditions of the intended application.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies in a standardized 2.0x1.6mm package. The series provides options for different output voltages and logic types. The 'PD' suffix indicates the inclusion of power-down capability. Other variants in the series may differ in frequency, such as 121.000 MHz or 51.200 MHz, but share similar physical characteristics.

Replacement Considerations

Direct replacements must match the 121.212 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility and electrical specifications of alternative sources. Cross-reference with other Mercury Electronics models in the same series if exact frequency availability is an issue.