18QHTF21-7.9488-PD

Overview

The 18QHTF21-7.9488-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 7.9488 MHz and utilizes LVCMOS output logic. The device is designed for low-power applications with a supply voltage of 1.8V and includes a standby or power-down function to reduce current consumption when inactive. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount assembly on printed circuit boards.

Feature Summary

• Integrates a standby (power-down) function for energy efficiency
• Utilizes LVCMOS output logic for digital interface compatibility
• Designed for low-voltage operation at 1.8V

Applications

• Power-sensitive electronic designs requiring clock signals
• Portable devices utilizing surface-mount technology
• Digital systems needing standard frequency references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your system design before procurement. Confirm that the 1.8V supply voltage aligns with your target platform's power rails. Ensure the 4-SMD No Lead package dimensions fit within your PCB layout constraints. Cross-reference the manufacturer's datasheet for absolute maximum ratings to prevent operational damage during integration.

Selection Notes

Select this component when a precise 7.9488 MHz reference is required for LVCMOS-compatible circuits. The integrated power-down feature makes it suitable for battery-operated or energy-efficient applications. Consider the 1.8V operating voltage as a primary constraint for power supply design. Evaluate the small form factor benefits for high-density board layouts compared to larger oscillator packages.

Part Context

Mercury Electronics Ind. Co. Ltd specializes in frequency control products, including quartz crystals, oscillators, and filters. The 18QHTF21 series represents their line of surface-mount crystal oscillators. This specific model falls under the standard XO category, providing fixed-frequency outputs for timing applications in consumer and industrial electronics.

Replacement Considerations

Compatible substitutes include other 7.9488 MHz LVCMOS oscillators in 4-SMD packages from manufacturers such as Epson or SiTime. Verify equivalent electrical parameters, specifically supply voltage and current consumption, to ensure functional interchangeability without redesigning the power circuitry.