18QHTF21-74.92788-PD

Overview

The 18QHTF21-74.92788-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 74.92788 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a power-down standby function to reduce consumption during inactive periods. 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 stable timing signals.

Feature Summary

• Supports low-voltage operation at 1.8V for energy-efficient system integration
• Includes a power-down standby mode to minimize current draw when not in use
• Provides LVCMOS output signals compatible with standard digital logic interfaces
• Utilizes a small form-factor surface-mount package for space-constrained designs

Applications

• Clock generation for embedded microprocessors and microcontrollers
• Timing reference for communication interface circuits
• Synchronization sources for digital signal processing systems
• Power management units requiring precise internal clocking

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the PCB footprint matches the 2.0x1.6mm SMD no-lead package dimensions. Check for any specific reflow soldering profile recommendations provided by the manufacturer to ensure joint integrity.

Selection Notes

Choose this oscillator when a 74.92788 MHz frequency is required for LVCMOS-compatible digital logic. Consider the 1.8V operating voltage to match low-power system architectures. The integrated power-down feature makes it suitable for battery-operated devices where standby current reduction is critical. Evaluate the physical size constraints to ensure the 2.0x1.6mm package fits within the available board area.

Part Context

This component belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequencies and voltages, typically featuring LVCMOS outputs and power-down capabilities. These oscillators are designed for applications demanding reliable timing in compact electronic devices, leveraging quartz technology for stability.

Replacement Considerations

Direct substitutes include other 18QHTF21 variants with identical pinout and electrical characteristics but different frequencies, such as 18QHTF21-74.250-PD or 18QHTF21-75.000-PD, if frequency adjustment is permissible. Cross-reference with other manufacturers offering 2.0x1.6mm LVCMOS oscillators at 1.8V, ensuring frequency accuracy and load capacitance compatibility.