18QHTF21-81.920-PD

Overview

The 18QHTF21-81.920-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 81.92 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. It features a power-down capability, allowing for standby mode operation to reduce energy consumption when not in active use. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6mm, suitable for surface-mount assembly processes.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes power-down functionality for standby mode operation
• Utilizes a small form factor 4-SMD no-lead package

Applications

• General-purpose clock signal generation in embedded systems
• Timing reference for microcontrollers and processors
• Digital communication interfaces requiring precise frequency stability

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure that the 1.8V supply voltage aligns with your system's power rails. Confirm that the 4-SMD package footprint matches your PCB layout constraints. Check for any specific operating temperature range limitations defined in the official datasheet for your application environment.

Selection Notes

Select this component when a stable 81.92 MHz clock source is required for LVCMOS-compatible digital circuits. Consider the 1.8V operating voltage as a primary constraint for power supply design. The integrated power-down feature makes it suitable for battery-operated or power-sensitive applications. Evaluate the physical size of the 2.0x1.6mm package against available board space.

Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequencies tailored for different digital timing needs. The 'PD' suffix indicates the inclusion of a power-down control pin. These components are designed to replace through-hole crystals with more stable and easier-to-integrate surface-mount solutions.

Replacement Considerations

Direct replacements must match the 81.92 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify pinout compatibility if substituting with other manufacturers' parts. Ensure equivalent electrical characteristics such as phase noise and jitter specifications are met for critical timing applications.