18QHTF21-12.544-PD

Overview

The 18QHTF21-12.544-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 12.544 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a power-down function for standby mode control. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports low-voltage operation at 1.8V
• Includes power-down capability for energy management
• Provides LVCMOS output signal compatibility

Applications

• Digital clock signal generation
• Data communication interface timing
• Embedded system clock sources

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply rail stability meets the oscillator's operational specifications. Ensure the PCB footprint matches the 4-SMD no-lead package dimensions to prevent assembly issues during manufacturing.

Selection Notes

Select this component when a precise 12.544 MHz reference is required for LVCMOS-compatible digital circuits. Consider the 1.8V operating voltage constraint and the necessity for a power-down feature to manage system power consumption. Evaluate the small form factor suitability for space-constrained printed circuit board layouts.

Part Context

This model belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequencies within a standardized 2.0x1.6 mm package. The PD suffix indicates the inclusion of a power-down pin or control functionality for standby operations.

Replacement Considerations

Direct substitutes include other 12.544 MHz LVCMOS oscillators in 4-SMD packages with 1.8V operation and power-down features from compatible manufacturers. Verify pinout compatibility and electrical parameter alignment before substitution.