18QHTF21-12.000-PD

Overview

The 18QHTF21-12.000-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind. Co. Ltd. It operates at a frequency of 12.000 MHz and utilizes LVCMOS output logic levels. The device supports a supply voltage of 1.8V and features a power-down (standby) function for energy management. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• Provides stable 12.000 MHz clock signal generation
• Integrates low-voltage CMOS output interface
• Includes standby mode capability for power reduction

Applications

• Digital system clock generation
• Communication interface timing
• Microcontroller peripheral 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 4-SMD no-lead package footprint matches your PCB layout specifications to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this component when a 12 MHz reference is required with low-power operation constraints. The LVCMOS output is compatible with standard digital logic families operating at 1.8V. Consider the power-down feature if battery life or thermal management is critical. Validate that the 4-SMD package size fits within the available board space compared to larger through-hole alternatives.

Part Context

This model belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronic. The series typically offers various frequencies and voltage options. The 'PD' suffix indicates the inclusion of a power-down control pin, distinguishing it from always-on variants. This specific part provides a fixed 12 MHz output, serving as a primary clock source for embedded systems.

Replacement Considerations

Direct replacements must match the 12.000 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pinout compatibility to ensure the power-down function connects correctly. Cross-reference with other Mercury 18QHTF21 variants or industry-standard equivalents that support identical electrical parameters and physical dimensions.