18QHTF21-6.540-PD

Overview

The 18QHTF21-6.540-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 6.54 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package, designed for surface-mount applications.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby mode to reduce power consumption during idle periods
• Utilizes a lead-free 4-SMD surface-mount package

Applications

• General timing circuits requiring stable clock signals
• Embedded systems with low-voltage logic requirements
• Portable electronic devices utilizing battery power

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD no-lead package dimensions fit within your PCB layout constraints. Cross-reference the manufacturer datasheet for detailed electrical characteristics and reliability data.

Selection Notes

Select this component when a precise 6.54 MHz clock signal is required for LVCMOS-compatible digital logic. Consider the 1.8V operating voltage as a primary constraint for power supply design. The integrated standby feature makes it suitable for applications where power efficiency during non-active states is critical. Evaluate the physical footprint of the 4-SMD package against available board space.

Part Context

This oscillator belongs to the Mercury Electronics XO series, which provides standard timing solutions. The model number indicates a 6.54 MHz frequency variant within the 18QHTF21 family. These components are designed for general-purpose timing applications in consumer and industrial electronics, offering reliable performance in a small form factor.

Replacement Considerations

Direct substitutes include other 6.54 MHz LVCMOS oscillators in 4-SMD packages from compatible manufacturers. Verify pinout compatibility and electrical specifications such as supply voltage and current consumption before substitution.