18QHTF21-77.863-PD

Overview

The 18QHTF21-77.863-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 77.863 MHz and utilizes LVCMOS output logic levels. The device requires a 1.8V supply voltage and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm. This component is designed for applications requiring precise timing signals within space-constrained electronic systems.

Feature Summary

• LVCMOS output interface for digital compatibility
• Integrated standby and power-down functionality
• Compact 4-SMD no-lead surface mount package

Applications

• General clock signal generation in embedded systems
• Timing reference for digital communication interfaces
• Power-efficient portable electronic devices

Procurement Notes

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

Selection Notes

Select this model when a low-voltage 1.8V operation is required alongside a standard LVCMOS output. The small 2.0x1.6 mm form factor makes it suitable for dense circuit boards. Consider the built-in power-down feature if energy conservation is a priority. Validate that the 77.863 MHz frequency meets the exact timing requirements of the application without needing external dividers.

Part Context

This part belongs to the QHTF series of surface-mount oscillators from Mercury Electronics. The series typically offers various frequencies and supply voltages. The 'PD' suffix likely indicates the inclusion of a power-down control pin or feature. These components are generally used as primary clock sources in consumer electronics and industrial control modules where size and power efficiency are critical constraints.

Replacement Considerations

Direct substitutes must match the 77.863 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility and thermal characteristics. Cross-reference with other manufacturers offering similar ultra-small form factor oscillators with identical electrical parameters to ensure seamless integration.