18QHTF21-8.0004-PD

Overview

The 18QHTF21-8.0004-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 8.0004 MHz and utilizes LVCMOS output logic. The device is designed for low-power applications, featuring a supply voltage of 1.8V and a standby power-down mode. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6 mm. This component serves as a precise clock source for digital circuits requiring stable timing signals.

Feature Summary

• Supports low-voltage operation at 1.8V with integrated standby functionality
• Delivers LVCMOS output logic for direct digital interface compatibility
• Utilizes a leadless surface-mount package for space-constrained designs

Applications

• Clock generation for microprocessors and microcontrollers
• Timing reference for communication interfaces
• Synchronization sources for digital signal processing systems

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 PCB footprint matches the 4-SMD no-lead package dimensions to prevent assembly issues. Check for any specific reflow soldering profile recommendations provided in the official datasheet to maintain component integrity during manufacturing.

Selection Notes

Select this oscillator when a precise 8.0004 MHz frequency is required for LVCMOS-compatible digital logic. Consider the 1.8V operating voltage to ensure compatibility with low-power embedded systems. The small 2.0x1.6 mm form factor makes it suitable for dense board layouts. Evaluate the need for standby power-down capabilities if energy efficiency is a critical design constraint for the application.

Part Context

This component belongs to the Mercury Electronics XO series, which specializes in quartz-based frequency control products. The manufacturer has decades of experience in producing crystals and oscillators. The 18QHTF21 series typically offers standard performance levels for general-purpose timing applications. It represents a balance between size, power consumption, and frequency stability for consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other 8.0004 MHz LVCMOS oscillators in 4-SMD packages from compatible manufacturers. Verify pinout compatibility and electrical specifications such as supply voltage and output swing. Ensure the replacement part meets the same temperature range and load capacitance requirements. Cross-reference with the manufacturer's official substitution guide for validated alternatives.