18QHTF21-1.120-PD

Overview

The 18QHTF21-1.120-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 1.12 MHz and utilizes LVCMOS output logic levels. The device is designed for a supply voltage of 1.8V and includes a standby or power-down function to reduce consumption when inactive. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• Supports low-voltage operation at 1.8V with LVCMOS interface compatibility
• Integrates a standby mode for effective power management during idle periods
• Utilizes a leadless SMD package design for streamlined surface-mount assembly

Applications

• Consumer electronics requiring low-power clock sources
• Portable devices utilizing 1.8V logic families
• Embedded systems needing precise 1.12 MHz timing references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply rail is stable within the datasheet specifications. Ensure the PCB footprint matches the 4-SMD No Lead package dimensions provided in the official mechanical drawings. Check for any specific reflow soldering profile recommendations to maintain component integrity during assembly processes.

Selection Notes

Select this component when a fixed 1.12 MHz frequency is required rather than a programmable alternative. The LVCMOS output is appropriate for digital interfaces compatible with standard CMOS voltage levels. Consider the power-down feature if energy efficiency is critical for battery-operated applications. Ensure the operating temperature range specified in the datasheet meets the environmental conditions of the final product deployment.

Part Context

This part belongs to the 18QHTF21 series of crystal oscillators from Mercury Electronics. The series typically offers various frequencies and voltage options within similar form factors. The suffix PD indicates the inclusion of a power-down control pin, distinguishing it from continuous-operation variants. This model specifically targets niche frequency applications where 1.12 MHz is the standard requirement.

Replacement Considerations

Direct replacements must match the 1.12 MHz frequency, 1.8V supply, and LVCMOS output type. Verify that substitute components support the same 4-SMD No Lead package dimensions to ensure mechanical compatibility. Check if alternative manufacturers offer equivalent power-down functionality. Cross-reference electrical parameters such as phase noise and jitter to maintain system performance stability.