18QHTF21-81.900-PD

Overview

The 18QHTF21-81.900-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 81.9 MHz and utilizes LVCMOS output logic. The device requires a supply voltage of 1.8V and features a power-down pin for standby mode control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.

Feature Summary

• Supports low-voltage operation at 1.8V
• Includes power-down functionality for energy management
• Provides LVCMOS digital output signals

Applications

• General-purpose clock signal generation
• Embedded system timing references
• Digital circuit synchronization

Procurement Notes

Verify the specific operating temperature range and load capacitance requirements against the target application design before procurement. Confirm that the 1.8V supply rail is stable and within tolerance to ensure accurate frequency performance. Ensure the PCB layout accommodates the 2.0x1.6mm footprint and provides adequate grounding for the SMD package.

Selection Notes

Select this component when a precise 81.9 MHz reference is required for low-power applications. The integrated power-down feature makes it suitable for battery-operated devices or systems requiring active standby states. Compare against other Mercury oscillators if different frequencies or voltage levels are needed.

Part Context

This part belongs to the Mercury Electronics XO series, designed for surface-mount integration. The 'PD' suffix indicates the inclusion of a power-down control input, allowing the oscillator to be disabled to reduce current consumption during inactive periods.

Replacement Considerations

Direct replacements must match the 81.9 MHz frequency, 1.8V supply, and LVCMOS output. Verify that substitute parts support the same 2.0x1.6mm package and power-down functionality to maintain board compatibility.