18QHTF21-90.000-PD

Overview

The 18QHTF21-90.000-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 90 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and features a standby or power-down function for energy management. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0mm x 1.6mm. This component is designed for timing applications requiring precise clock signals in space-constrained electronic systems.

Feature Summary

• Supports low-voltage operation at 1.8V for efficient power consumption
• Includes standby and power-down functionality to reduce current draw when inactive
• Delivers stable LVCMOS output signals for digital circuit synchronization

Applications

• Battery-powered portable electronic devices
• Compact consumer electronics requiring small form factors
• Digital communication systems needing precise clock references

Procurement Notes

Verify the exact frequency tolerance and load capacitance requirements against your specific circuit design before procurement. Ensure that the 1.8V supply rail is stable and within the specified operating range to maintain signal integrity. Confirm that the PCB footprint matches the 4-SMD no-lead package dimensions provided in the official datasheet to avoid assembly issues during manufacturing.

Selection Notes

Select this model when a 90 MHz clock signal is required with minimal power consumption. The 1.8V operating voltage makes it suitable for modern low-power digital logic families. Consider the 2.0x1.6mm package size if board real estate is limited. The inclusion of a power-down feature adds value for applications requiring intermittent operation or extended battery life in portable devices.

Part Context

This part belongs to the QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various frequencies and voltage options, typically ranging from 1.8V to 3.3V. The 'PD' suffix indicates the presence of a power-down control pin, allowing the user to disable the oscillator output to save power. These components are widely used in timing-critical applications across industrial and consumer markets.

Replacement Considerations

Direct replacements must match the 90 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify that any substitute component supports the same power-down functionality and has compatible electrical characteristics such as phase noise and jitter specifications to ensure system stability.