18QHTF21-109.000-PD

Overview

The Mercury Electronics 18QHTF21-109.000-PD is a high-stability crystal oscillator designed for precision timing applications. It operates at a fundamental frequency of 109.000 MHz, housed in a compact 1812 (4532 metric) surface-mount package. The device utilizes a PMOS output stage and supports a parallel resonant load configuration. Key electrical specifications include a supply voltage range of 1.8V to 3.3V, with a typical current consumption of 6mA. Frequency stability is maintained within ±10ppm over the commercial temperature range of -20°C to +70°C, ensuring reliable performance in demanding electronic systems requiring accurate clock signals.

Feature Summary

• High-frequency stability with low phase noise characteristics suitable for precision timing
• Compact surface-mount packaging optimized for automated assembly processes
• Wide supply voltage compatibility supporting various digital logic families

Applications

• High-speed data communication interfaces requiring precise clock synchronization
• Network equipment and telecommunications infrastructure components
• Consumer electronics devices utilizing USB or HDMI high-bandwidth protocols

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest datasheet to ensure correct pinout and electrical parameters. Confirm that the requested part number matches the exact frequency tolerance and operating temperature range required by your design. Cross-reference the package dimensions with your PCB footprint library to guarantee mechanical compatibility before finalizing procurement orders.

Selection Notes

Select this component when designing circuits that demand a stable 109MHz reference signal in a small form factor. Ensure the host system provides a clean power supply within the specified voltage range to maintain frequency accuracy. Consider thermal management requirements if the operating environment exceeds standard commercial temperature limits, as stability may vary outside the rated range.

Part Context

This oscillator belongs to Mercury Electronics's series of high-performance surface-mount crystal oscillators. These components are engineered to replace discrete crystal and buffer combinations, offering reduced board space and improved signal integrity. The 18QHTF21 series is widely used in applications where size constraints and timing precision are critical design factors.

Replacement Considerations

Direct replacements must match the 109.000MHz frequency, 1812 package, and PMOS output type. Verify equivalent stability and voltage specifications from alternative manufacturers to ensure functional parity without circuit redesign.