18QHTF21-81.440-PD

Overview

The 18QHTF21-81.440-PD is a quartz crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 81.440 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and supports a standby power-down function. It features a 4-SMD, no-lead package suitable for surface-mount applications. The unit is designed for standard clock signal generation in electronic circuits requiring precise timing references.

Feature Summary

• Supports standby mode for power management
• LVCMOS output interface compatibility
• Compact surface-mount package design

Applications

• General purpose clock signal generation
• Digital circuit timing references
• Embedded system clock sources

Procurement Notes

Verify the specific frequency tolerance and operating temperature range against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Ensure the 4-SMD no-lead footprint matches the PCB layout requirements to guarantee proper soldering and mechanical stability during assembly processes.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside a compact SMD form factor. The LVCMOS output ensures compatibility with standard digital logic families. Consider the standby feature if power efficiency during idle states is a critical design constraint for the application environment.

Part Context

This model belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz frequency control products. The series includes various frequencies such as 51.2 MHz and 96.768 MHz, all sharing similar package and electrical characteristics. Mercury Electronics has a long history in quartz manufacturing, providing standardized oscillator solutions for industrial and consumer electronics.

Replacement Considerations

Direct substitutes within the same series include models like 18QHTF21-51.200-PD or 18QHTF21-96.768-PD, provided the frequency difference is acceptable. Verify pinout and voltage compatibility when cross-referencing with other manufacturers' LVCMOS oscillators in the 4-SMD no-lead package.