QT49S-20.500MAGQ-T

Overview

The QT49S-20.500MAGQ-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precision timing applications in electronic circuits. It operates at a fundamental frequency of 20.5 MHz with a load capacitance of 10 pF. The component exhibits a frequency tolerance of ±30 ppm and a frequency stability of ±50 ppm over the operating temperature range of -20°C to +70°C. This device utilizes an HC-49S package format, ensuring compatibility with standard automated assembly processes while providing reliable performance for microcontroller clock sources.

Feature Summary

• Surface-mount design for automated PCB assembly
• Fundamental mode operation at 20.5 MHz
• Stable frequency performance within specified thermal limits

Applications

• Microcontroller clock generation
• Digital signal processing circuits
• Communication interface modules

Procurement Notes

Verify the complete part number against official manufacturer documentation to ensure correct suffix interpretation. Confirm that the specific ordering code matches the required load capacitance and stability specifications. Cross-reference the datasheet to validate the package type and terminal configuration before procurement to avoid integration errors.

Selection Notes

Select this component when a 20.5 MHz surface-mount crystal with 10 pF load capacitance is required. Ensure the application environment remains within the -20°C to +70°C operational range to maintain the specified ±50 ppm stability. Verify that the circuit design accommodates the specific frequency tolerance of ±30 ppm for accurate timing synchronization.

Part Context

This model belongs to the QT49S series of quartz crystals from QST, which are engineered for general-purpose timing needs. The series offers various frequency options and stability grades, utilizing standardized surface-mount packages to facilitate modern electronics manufacturing. These components serve as essential passive elements for establishing precise clock signals in digital systems.

Replacement Considerations

Direct substitutes include other 20.5 MHz surface-mount crystals with identical 10 pF load capacitance and compatible package dimensions. Verify that alternative parts meet or exceed the ±50 ppm stability requirement across the -20°C to +70°C temperature range to ensure functional equivalence.