18QHTF21-4.500-OE

Oscillators Overview

The 18QHTF21-4.500-OE is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 4.5 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications, functioning at 1.8V. It features an enable/disable control pin for power management flexibility. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm, suitable for surface-mount assembly.

Oscillators Feature Summary

• Supports LVCMOS output signal compatibility
• Includes enable/disable functionality for power control
• Operates on a 1.8V supply voltage
• Utilizes a compact 4-SMD no-lead package

Oscillators Applications

• General-purpose timing circuits requiring low voltage operation
• Embedded systems utilizing LVCMOS interfaces
• Portable electronic devices constrained by size and power

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V operating voltage aligns with the system's power rail availability. Ensure the PCB footprint matches the 2.0x1.6mm SMD package dimensions to prevent assembly errors. Cross-reference the datasheet for any specific soldering profile recommendations to maintain component integrity during reflow processes.

Oscillators Selection Notes

Select this component when a precise 4.5 MHz clock source is required within space-constrained designs. The LVCMOS output ensures direct interfacing with compatible digital logic without additional level shifting. The enable pin allows for dynamic power management, making it suitable for battery-operated applications. Consider the 1.8V supply requirement to ensure compatibility with existing voltage regulators in the system architecture.

Oscillators Part Context

This part belongs to the 18QHTF21 series from Mercury Electronic Ind. Co., Ltd., which offers various standard XO options. The series provides multiple frequency choices within a consistent small form factor. Other variants in this family include frequencies such as 6.3 MHz, 13.1313 MHz, and 21.1184 MHz, all sharing similar package and electrical characteristics.

Oscillators Replacement Considerations

Direct replacements must match the 4.5 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility for the enable function. Alternative parts from other manufacturers require careful evaluation of jitter specifications and load capacitance to ensure functional equivalence.