18QHTF21-11.289-PD

Overview

The 18QHTF21-11.289-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 11.289 MHz with an LVCMOS output logic level. The device requires a 1.8V supply voltage and features a Standby (Power Down) control 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 CMOS (LVCMOS) output interface for digital circuit compatibility
• Includes standby mode capability to reduce power consumption during inactive periods
• Designed for surface mount assembly using a leadless four-terminal SMD package

Applications

• Clock signal generation for embedded microcontrollers
• Timing reference for communication interfaces
• Synchronization sources for consumer electronic devices

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 specifications. Ensure the PCB footprint matches the 2.0mm x 1.6mm package dimensions. Check for any specific reflow soldering profile recommendations provided by the manufacturer to ensure joint integrity.

Selection Notes

Select this component when a low-voltage 1.8V operation is required for timing applications. The LVCMOS output is suitable for direct interfacing with standard digital logic families. Consider the small form factor for space-constrained designs. Verify that the operating temperature range aligns with the environmental conditions of the end application.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz-based frequency control products. The series includes various oscillators such as XO, TCXO, and VCTCXO types. The 'PD' suffix typically indicates the presence of a power-down or standby pin functionality within this product line.

Replacement Considerations

Direct substitutes must match the 11.289 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify pinout compatibility and electrical characteristics. Alternative parts from other manufacturers require validation of thermal performance and frequency stability under similar conditions.