18QHTF21-81.000-PD

Overview

The 18QHTF21-81.000-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 81 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and features a power-down standby function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm. The component supports industrial temperature ranges and includes spread spectrum capabilities to reduce electromagnetic interference.

Feature Summary

• Supports low-voltage 1.8V operation for portable applications
• Integrates LVCMOS output interface for digital compatibility
• Includes power-down standby mode to minimize current consumption
• Utilizes small form factor SMD packaging for space-constrained designs

Applications

• Battery-powered portable electronic devices
• Digital signal processing systems requiring precise timing
• Communication equipment utilizing LVCMOS interfaces
• Embedded systems with strict size limitations

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply rail matches the oscillator's electrical specifications. Ensure the PCB footprint aligns with the 2.0x1.6mm SMD package dimensions. Check for RoHS compliance status if required by your manufacturing standards. Validate the power-down control signal compatibility with your system logic levels.

Selection Notes

Select this model when a stable 81 MHz clock source is required for LVCMOS-compatible circuits. Consider the 1.8V operating voltage as a primary constraint for power supply design. Evaluate the need for power-down functionality to meet battery life targets. Assess the physical space constraints to ensure the 2.0x1.6mm package fits the layout. Compare alternative frequencies if the exact 81 MHz requirement is flexible.

Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series typically offers various frequency options within a standardized 2.0x1.6mm package. These components are designed for high-volume consumer electronics and industrial applications requiring reliable timing solutions. The 'PD' suffix indicates the inclusion of a power-down feature, distinguishing it from standard continuous-operation variants.

Replacement Considerations

Direct replacements must match the 81 MHz frequency, 1.8V supply, and LVCMOS output type. Verify pinout compatibility for the 4-SMD no-lead package. Check thermal characteristics and operating temperature range alignment. Ensure the substitute component supports similar jitter performance if critical for the application.