18QHTF21-81.818-PD

Overview

The 18QHTF21-81.818-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a fixed frequency of 81.818 MHz and utilizes LVCMOS output logic. The device is designed for low-power applications, requiring a supply voltage of 3.3V. It features a power-down function to reduce energy consumption when not in active use. The component is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm x 1.6mm. This surface-mount oscillator is suitable for timing applications requiring precise frequency generation.

Feature Summary

• Standard XO configuration with LVCMOS output interface
• Integrated power-down capability for standby mode operation
• Compact 4-SMD no-lead surface mount package design

Applications

• Precision timing circuits requiring stable clock signals
• Low-power embedded systems and portable devices
• Digital communication interfaces needing accurate frequency generation

Procurement Notes

Verify the specific ordering suffix and frequency tolerance against project requirements before procurement. Confirm that the 3.3V supply voltage aligns with the target system's power rails. Ensure the 2.0x1.6mm footprint matches the PCB layout constraints. Check for any specific reflow soldering profile recommendations provided in the official datasheet to ensure reliable assembly and long-term performance.

Selection Notes

Select this component when a fixed 81.818 MHz clock source is required with LVCMOS compatibility. Consider the 3.3V operating voltage and low-profile SMD package for space-constrained designs. Evaluate the need for power-down functionality to manage system standby currents. Compare against other Mercury oscillators if different frequencies or voltage levels are needed.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronic Ind. Co., Ltd, a supplier specializing in quartz crystals and oscillators. The series offers various frequencies and voltage options within a standardized small outline package. Mercury Electronics has established itself as a pioneer in the Taiwan crystal industry since 1973, providing frequency control products for global electronics markets.

Replacement Considerations

Direct substitutes include other 81.818 MHz LVCMOS oscillators in 2.0x1.6mm packages from compatible manufacturers. Verify electrical parameters such as supply voltage, current consumption, and load capacitance. Ensure mechanical compatibility with the existing footprint. Cross-reference with Mercury's own product line for alternative frequencies or voltages if system requirements change.