18QHTF21-71.5909-PD

Overview

The 18QHTF21-71.5909-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 71.5909 MHz and utilizes LVCMOS output logic. The device is designed for 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 with dimensions of 2.0 x 1.6 mm. This component is engineered for applications requiring precise timing signals within space-constrained electronic designs.

Feature Summary

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

Applications

• General-purpose clock generation in embedded systems
• Timing reference for high-speed data communication interfaces
• Power management circuits requiring precise frequency control

Procurement Notes

Verify the exact frequency specification against the target design requirements before procurement. Confirm that the 1.8V supply voltage aligns with the system's power rails. Ensure the PCB footprint matches the 4-SMD no-lead package dimensions to prevent assembly errors. Cross-reference the part number suffix to confirm the specific operating temperature range and tolerance if critical for the application environment.

Selection Notes

Select this component when a low-voltage, small-form-factor oscillator is required. The LVCMOS output is suitable for direct interfacing with most modern digital logic families. Consider the power-down feature if battery life or thermal management is a priority. Verify that the 71.5909 MHz frequency meets the specific clocking needs of the downstream components without requiring additional frequency multiplication or division stages.

Part Context

This model belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal and oscillator products. The series is characterized by its compact size and low power consumption. Mercury Electronics has a long history in the frequency control industry, providing reliable timing solutions for various consumer and industrial electronics markets globally.

Replacement Considerations

Direct substitutes include other 18QHTF21 variants with identical pinouts and electrical characteristics but different frequencies, such as 18QHTF21-71.5909 (without PD) if power-down is not needed. Ensure any replacement maintains the 1.8V supply and LVCMOS output type. Verify that the physical dimensions remain compatible with the existing PCB layout.