18QHTF21-78.598-PD

Overview

The 18QHTF21-78.598-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 78.598 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down mode capability. It is housed in a compact 4-SMD, no lead package with dimensions of 2.0 x 1.6 mm. This component serves as a precise clock source for digital circuits requiring low voltage operation and small form factor integration.

Feature Summary

• Supports LVCMOS output logic for standard digital interface compatibility
• Includes standby or power-down functionality to reduce power consumption
• Utilizes a surface-mount 4-SMD no-lead package for automated assembly

Applications

• Clock generation for digital signal processing systems
• Timing reference for communication interfaces
• Power management circuits requiring precise frequency control

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Ensure that the 1.8V supply voltage aligns with the system's power rails. Confirm that the PCB footprint matches the 2.0x1.6mm SMD package dimensions to avoid soldering issues during assembly.

Selection Notes

Select this model when a 78.598 MHz clock signal is required with LVCMOS outputs. Consider the 1.8V operating voltage and the availability of a power-down feature for energy-sensitive designs. The small 4-SMD package makes it suitable for space-constrained applications compared to larger through-hole alternatives.

Part Context

This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies within a standardized 2.0x1.6mm SMD package. The series typically supports LVCMOS outputs and includes power-down capabilities across different frequency options, providing a consistent form factor for designers scaling projects.

Replacement Considerations

Direct substitutes include other 18QHTF21 series variants with identical package and electrical characteristics but different frequencies, such as 18QHTF21-8.000-PD or 18QHTF21-51.200-PD, provided the frequency difference is acceptable for the application.