18QHTF21-70.500-PD

Overview

The 18QHTF21-70.500-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a frequency of 70.5 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.

Feature Summary

• Integrates LVCMOS output logic for digital interface compatibility
• Supports standby mode to reduce power consumption during idle periods
• Utilizes a leadless SMD package for automated surface-mount assembly

Applications

• General-purpose clock signal generation in electronic circuits
• Timing reference for digital systems requiring 70.5 MHz stability
• Embedded devices utilizing low-voltage 1.8V logic families

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the system design specifications before procurement. Confirm that the 1.8V supply voltage aligns with the target circuit's power rails. Ensure the 4-SMD no-lead footprint matches the PCB layout constraints. Cross-reference the datasheet for operating temperature ranges to guarantee reliability under intended environmental conditions.

Selection Notes

Select this component when a stable 70.5 MHz clock source is required for LVCMOS-compatible digital logic. The choice is driven by the need for low-power operation via the standby feature and the space-saving benefits of the leadless SMD package. Consider the manufacturer's reputation for frequency control products when evaluating long-term supply chain stability and consistency.

Part Context

This part belongs to the Mercury Electronics 18QHTF21 series of standard XO oscillators. The series offers various frequencies and voltage options within a consistent 4-SMD form factor. The 'PD' suffix typically indicates specific packaging or handling characteristics defined by the manufacturer. This model represents a mid-range frequency option within the product line.

Replacement Considerations

Direct substitutes must match the 70.5 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package dimensions. Verify pinout compatibility and electrical parameters such as phase noise and jitter if critical. Alternative sources from other manufacturers require careful validation of mechanical and electrical specifications.