18QHTF21-79.0505-OE

Overview

The 18QHTF21-79.0505-OE is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 79.0505 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications with a supply voltage of 1.8V. It features an enable/disable control function to manage power consumption. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. This surface-mount oscillator is suitable for timing applications requiring precise clock signals in space-constrained electronic designs.

Feature Summary

• Provides stable 79.0505 MHz clock signal generation using LVCMOS output interface
• Operates on a single 1.8V power supply for low-power system integration
• Includes hardware enable/disable pin for active power management control
• Utilizes a small-footprint 4-SMD no-lead package for dense PCB layouts

Applications

• High-speed digital data transmission interfaces
• Precision timing circuits in communication modules
• Embedded systems requiring low-voltage clock sources
• Consumer electronics with space-constrained form factors

Procurement Notes

Verify the specific suffix (OE vs PD) against your design requirements, as it may indicate different packaging or shipping configurations. Confirm that the 1.8V supply voltage aligns with your target circuit's power domain. Ensure the 4-SMD footprint matches your PCB land pattern exactly. Check for any RoHS compliance documentation if required by your manufacturing standards. Validate the operating temperature range against your environmental specifications before finalizing the order.

Selection Notes

Choose this model when a precise 79.0505 MHz frequency is mandatory for system synchronization. The LVCMOS output is ideal for direct interfacing with standard logic families without additional level shifting. The enable/disable feature makes it suitable for battery-powered devices requiring power optimization. Consider the 2.0x1.6mm size if board real estate is limited. Ensure the 1.8V supply is stable to maintain frequency accuracy and signal integrity across the operating range.

Part Context

This component belongs to Mercury Electronics' line of quartz-based timing solutions. The manufacturer specializes in frequency control products including crystals, oscillators, and filters. The 18QHTF series represents their standard XO offerings designed for general-purpose timing applications. Mercury Electronics has established itself as a supplier of precision timing components since 1973, focusing on reliability and miniaturization for modern electronic assemblies.

Replacement Considerations

The 18QHTF21-79.0505-PD is a related variant from the same manufacturer, potentially differing only in packaging or shipping method rather than electrical performance. Verify that any substitute maintains the exact 79.0505 MHz frequency and LVCMOS output characteristics. Ensure the replacement part supports the same 1.8V supply voltage and physical 4-SMD footprint. Cross-reference datasheets to confirm identical enable/disable functionality and operating temperature ranges.