18QHTF21-12.3667-PD

Overview

The 18QHTF21-12.3667-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 12.3667 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications, functioning at 1.8V. A key operational characteristic is the inclusion of a standby or power-down mode to reduce energy consumption when not in active use. The component is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly processes.

Feature Summary

• Supports LVCMOS output interface for digital signal compatibility
• Includes standby functionality for power management
• Utilizes quartz-based resonance for frequency stability

Applications

• General clock signal generation in electronic circuits
• Timing reference for digital systems requiring 1.8V operation
• Embedded devices utilizing surface-mount technology

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. 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 constraints. Cross-reference the manufacturer part number with official distributor catalogs to ensure authenticity and correct revision status.

Selection Notes

Select this component when a precise 12.3667 MHz timing source is required within a 1.8V logic environment. Consider the LVCMOS output swing limits to ensure compatibility with downstream input thresholds. Evaluate the need for power-down capabilities if energy efficiency is a critical design parameter. Verify that the operating temperature range meets the environmental conditions of the intended application.

Part Context

This oscillator belongs to the Mercury Electronics SMD XO series, characterized by small form factors and low voltage operation. The '18' prefix typically indicates the 1.8V supply requirement, while 'QHTF' denotes the specific series family. The '-PD' suffix confirms the inclusion of power-down functionality. This model represents a standard fixed-frequency solution rather than a programmable or temperature-compensated variant.

Replacement Considerations

Direct replacements must match the 12.3667 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package dimensions. Verify pinout compatibility and electrical characteristics such as rise/fall times and duty cycle. Consult manufacturer substitution guides for equivalent parts from other vendors offering identical specifications.