18QHTF21-12.688575-PD

Overview

The 18QHTF21-12.688575-PD is a crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 12.688575 MHz with LVCMOS output logic. The device requires a 1.8V supply voltage and features a standby (power down) function. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm.

Feature Summary

• Supports low voltage operation at 1.8V for energy efficiency
• Includes a standby or power down mode to reduce current consumption
• Utilizes LVCMOS output logic for standard digital interface compatibility
• Designed in a small surface-mount package suitable for space-constrained applications

Applications

• Portable electronic devices requiring low power consumption
• Digital systems utilizing LVCMOS clock signals
• Compact embedded circuits needing precise frequency control

Procurement Notes

Verify the exact frequency tolerance and load capacitance requirements against your circuit design specifications before procurement. Confirm that the 1.8V supply rail is stable within the operational limits defined in the official datasheet. Ensure the PCB footprint matches the 4-SMD No Lead package dimensions to prevent assembly issues. Cross-reference the part number suffix to confirm the specific packaging variant if required for automated placement.

Selection Notes

Select this component when a 12.688575 MHz clock source is strictly required for LVCMOS interfaces. Consider the 1.8V operating voltage constraint compared to other available logic families. Evaluate the physical size constraints against the 2.0mm x 1.6mm package profile. Assess the need for power-down functionality if battery life or thermal management is a critical design factor for the target application.

Part Context

This oscillator belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies within a standardized 4-SMD form factor. The series supports multiple supply voltages and output types, but this specific model is configured for 1.8V LVCMOS operation. It shares the same mechanical footprint as other variants in the family, allowing for potential design flexibility while maintaining consistent board layout standards across different frequency requirements.

Replacement Considerations

Direct substitutes include other 18QHTF21 series parts with identical pinout and package dimensions, such as the 18QHTF21-12.300-PD or 18QHTF21-12.688656-PD, provided the frequency difference is acceptable for the system timing. Verify that any replacement maintains the 1.8V supply requirement and LVCMOS output characteristics to ensure electrical compatibility without redesigning the surrounding circuitry.