18QHTF21-77.780-OE

Overview

The 18QHTF21-77.780-OE is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a frequency of 77.78 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and features an enable/disable control function. It is housed in a compact 4-SMD, No Lead package with dimensions of 1.6mm x 1.2mm and a height of 0.55mm. The component is designed for operation within a temperature range of -40°C to +85°C.

Feature Summary

• Supports enable/disable functionality via the VCC pin for power management
• Provides stable clock signals using LVCMOS output logic
• Utilizes a low-profile surface-mount package for space-constrained designs

Applications

• Portable electronic devices requiring low power consumption
• Communication equipment utilizing standard clock interfaces
• Embedded systems needing precise timing references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD no-lead package footprint matches your PCB layout specifications. Check for any specific handling instructions regarding electrostatic discharge protection during assembly.

Selection Notes

Select this component when a small form factor and low voltage operation are critical. Consider the LVCMOS interface compatibility with your target microcontroller or FPGA. Evaluate the thermal performance within the specified operating temperature range. Compare alternative frequencies if the exact 77.78 MHz requirement can be adjusted for availability.

Part Context

This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronics. The series is characterized by its miniature size and low power consumption, making it suitable for modern portable electronics. The 'OE' suffix typically indicates a specific ordering or packaging variant defined by the manufacturer.

Replacement Considerations

Direct replacements must match the 77.78 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package dimensions. Verify equivalent electrical characteristics such as phase noise and jitter if available in public datasheets.