18QHTF21-12.273-PD

Overview

The 18QHTF21-12.273-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 12.273 MHz with an LVCMOS output logic level. The device requires 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 with dimensions of 2.0 x 1.6 mm. This component is designed for applications requiring precise timing signals within low-voltage digital systems.

Feature Summary

• Supports LVCMOS output logic for direct interface with digital circuits
• Includes standby mode functionality to reduce power consumption
• Utilizes a leadless surface-mount package for automated assembly

Applications

• Clock signal generation for microprocessors
• Timing reference for communication interfaces
• Power management systems requiring low voltage operation

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Ensure that the 1.8V supply rail is stable and within the specified operating range to maintain oscillator performance. Confirm that the PCB footprint matches the 2.0x1.6mm SMD no-lead package dimensions to prevent soldering defects during assembly.

Selection Notes

Select this component when a low-profile, leadless oscillator is required for space-constrained designs. The 1.8V supply requirement makes it suitable for modern low-power digital logic families. Consider the standby feature if power efficiency is critical. Verify that the LVCMOS output swing is compatible with the input thresholds of the receiving device to ensure reliable signal transmission.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies in a standardized 2.0x1.6mm footprint. The series is characterized by its small form factor and low voltage operation, catering to portable electronics and compact industrial devices. The '-PD' suffix indicates the inclusion of a power-down control pin or function.

Replacement Considerations

Direct replacements must match the 12.273 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Check datasheets for equivalent parts from other manufacturers ensuring identical pinout and mechanical dimensions to facilitate drop-in replacement without PCB redesign.