18QHTF21-79.000-PD

Overview

The 18QHTF21-79.000-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 79.0 MHz and utilizes LVCMOS output logic. The device requires a supply voltage of 1.8V and features a standby (power down) control function. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm.

Feature Summary

• Supports low voltage operation at 1.8V for energy efficiency
• Includes standby mode capability to reduce power consumption
• Provides stable LVCMOS output signals for digital interfaces
• Utilizes a small form factor surface mount package

Applications

• Portable electronic devices requiring low power timing
• Communication equipment utilizing LVCMOS interfaces
• Embedded systems needing precise clock generation
• Consumer electronics with space constraints

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure that the 1.8V supply rail is stable and within the specified operating range to maintain oscillator performance. Confirm that the PCB layout supports the 4-SMD no lead package footprint to ensure reliable soldering and mechanical stability during assembly processes.

Selection Notes

Select this component when a 79.0 MHz clock signal is required with strict size limitations. The 1.8V supply requirement makes it suitable for modern low-voltage digital circuits. Consider the standby feature if power management is critical. Verify compatibility with the target system's I/O voltage levels to ensure proper signal integrity without additional level shifting components.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz-based frequency control products. The manufacturer has decades of experience in Taiwan producing crystals and oscillators. This series typically offers standard specifications with various frequency options, catering to general-purpose timing applications in consumer and industrial electronics markets.

Replacement Considerations

Direct substitutes include other 1.8V LVCMOS oscillators in 2.0x1.6mm packages from manufacturers like Epson or NDK, provided they match the 79.0 MHz frequency and pinout configuration. Cross-reference electrical parameters such as phase noise and jitter to ensure equivalent performance in the specific application environment.