18QHTF21-85.540-PD

Overview

The 18QHTF21-85.540-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 85.54 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and includes a standby or power-down function to manage energy consumption. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• LVCMOS output logic for digital interface compatibility
• Integrated standby and power-down functionality
• Compact 4-SMD no-lead surface mount package

Applications

• Digital signal processing systems
• Communication equipment clocking
• Microcontroller timing sources

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply voltage aligns with the system power rails. Ensure the 4-SMD footprint matches the PCB layout constraints. Cross-reference the datasheet for operating temperature range specifications to guarantee reliability under intended environmental conditions.

Selection Notes

Select this component when a low-voltage 1.8V operation is required alongside LVCMOS compatibility. The integrated power-down feature makes it suitable for battery-operated devices needing efficient standby modes. Consider the small form factor for space-constrained designs. Validate that the 85.54 MHz frequency meets the system's clocking needs without additional dividers.

Part Context

This part belongs to the 18QHTF series of standard oscillators from Mercury Electronics. The series offers various frequencies while maintaining consistent electrical characteristics and packaging. The 'PD' suffix typically indicates the inclusion of power-down capabilities. This family is designed for general-purpose timing applications requiring reliable performance in consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other 18QHTF series variants with identical pinouts and electrical specs but different frequencies, such as 18QHTF21-51.200-PD or 18QHTF21-68.085-PD, provided the frequency difference is acceptable for the application.