18QHTF21-19.997-PD

Oscillators Overview

The 18QHTF21-19.997-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 19.997 MHz and utilizes an LVCMOS output signal format. 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 surface-mount package designed for automated assembly processes.

Oscillators Feature Summary

• Integrates LVCMOS output interface for digital logic compatibility
• Features low-voltage operation with integrated power-down capability
• Utilizes lead-free surface-mount packaging for high-density board layouts

Oscillators Applications

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

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply rail is stable within the operational limits defined in the official datasheet to ensure reliable oscillator startup and sustained performance under varying thermal conditions.

Oscillators Selection Notes

Select this component when a standard frequency near 20 MHz is required with minimal footprint constraints. The choice depends on the availability of a compatible 1.8V power domain and the need for a simple LVCMOS interface without additional buffering. Ensure the application environment does not exceed the specified operating temperature range for the selected variant.

Oscillators Part Context

This model belongs to the 18QHTF21 series from Mercury Electronics, which focuses on small-form-factor oscillators. The series typically offers various frequency options within a standardized 4-SMD no-lead package. This specific part number denotes a fixed frequency variant optimized for cost-effective mass production in consumer and industrial electronics.

Oscillators Replacement Considerations

Direct substitutes include other 19.997 MHz XO devices in identical 4-SMD packages with matching 1.8V LVCMOS outputs. Verify pinout compatibility and electrical specifications such as phase noise and jitter before swapping components to maintain system timing integrity.