18QHTF21-7.8125-OE

Overview

The 18QHTF21-7.8125-OE is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 7.8125 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications, supporting 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 2.0x1.6 mm, suitable for surface-mount assembly.

Feature Summary

• Supports LVCMOS output signal compatibility
• Includes enable/disable control functionality
• Operates on a 1.8V supply voltage

Applications

• General-purpose digital timing circuits
• Embedded systems requiring precise clock signals
• Communication equipment baseband processing

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target system design before procurement. Confirm that the 1.8V operating voltage aligns with the host circuit's power rails. Ensure the 4-SMD no-lead package footprint matches the PCB layout specifications to guarantee proper soldering and mechanical stability during assembly.

Selection Notes

Select this component when a stable 7.8125 MHz clock source is required for low-power digital logic interfaces. The LVCMOS output ensures direct compatibility with standard microcontroller or FPGA inputs without additional level shifting. The enable pin allows for dynamic power management in battery-operated devices. Consider the small 2.0x1.6 mm package size for space-constrained designs.

Part Context

This part belongs to the Mercury Electronics XO series, which provides standard frequency generation solutions. The model number indicates a 7.8125 MHz frequency variant within the 18QHTF21 family. The suffix OE typically denotes the enable feature and specific packaging configuration. This series is designed for consumer electronics and industrial applications requiring reliable timing references.

Replacement Considerations

Direct substitutes must match the 7.8125 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm footprint. Verify equivalent electrical parameters such as phase noise and jitter if available in official datasheets. Cross-reference with other manufacturers offering identical pin-compatible packages and functional specifications.