18QHTF21-89.000-PD

Overview

The 18QHTF21-89.000-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 89 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications, requiring a supply voltage of 1.8V. A key functional characteristic is the inclusion of a standby or power-down mode to manage energy consumption when the oscillator is not actively driving the load. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm, suitable for surface-mount assembly on printed circuit boards.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby functionality for power management
• Utilizes a leadless surface-mount package design

Applications

• Digital clock signal generation
• Data communication interfaces
• Embedded system timing references

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Ensure that the 1.8V supply rail stability meets the oscillator's specifications to maintain frequency accuracy. Confirm that the PCB footprint matches the 4-SMD no-lead package dimensions provided in the official datasheet to avoid assembly issues.

Selection Notes

Select this component when a precise 89 MHz reference is required for LVCMOS-compatible digital circuits. Consider the 1.8V operating voltage constraint and the need for a power-down feature for battery-operated or energy-efficient designs. Evaluate the thermal performance and size constraints of the 2.0x1.6mm package relative to the available board space.

Part Context

This part belongs to the Mercury 18QHTF21 series of ultra-small crystal oscillators. The series is characterized by its miniature footprint and low voltage operation, targeting portable electronics and high-density PCB layouts. The 'PD' suffix typically indicates the presence of a power-down pin or function, distinguishing it from continuous-operation variants within the same family.

Replacement Considerations

Direct replacements must match the 89 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify that any substitute component supports the standby mode if required by the application design.