QT49S-24.576MAGK-T

Overview

The QT49S-24.576MAGK-T is a surface-mount quartz crystal resonator manufactured by QST, operating at a fundamental frequency of 24.576 MHz. It utilizes the HC-49SMD package with dimensions of 11.4 x 4.35 x 3.8 mm. The component features a load capacitance of 12 pF and an equivalent series resistance (ESR) of 30 Ohms. Frequency stability is rated at ±30 ppm across the -20°C to +70°C temperature range. This device serves as a precise timing element for digital circuits requiring stable clock signals.

Feature Summary

• Surface-mount design compatible with automated PCB assembly processes
• Provides stable oscillation frequency for microcontroller and communication systems
• Robust HC-49SMD housing ensures mechanical durability in compact layouts

Applications

• Microcontroller clock generation
• Communication module timing references
• Digital signal processing circuit synchronization

Procurement Notes

Verify the specific suffix MAGK against official QST documentation to confirm the exact frequency tolerance and temperature range specifications. Ensure the ordering part number matches the required load capacitance and ESR values for the target circuit design. Cross-reference the datasheet to validate the physical footprint compatibility with existing PCB silkscreens and solder mask definitions before finalizing procurement orders.

Selection Notes

Select this component when a standard 24.576 MHz reference is required for UART or SPI interfaces due to its common baud rate divisibility. Consider the ±30 ppm stability rating against system jitter requirements. Evaluate the HC-49SMD form factor for space-constrained designs where through-hole mounting is not feasible. Confirm that the 12 pF load capacitance aligns with the oscillator circuit's input and output capacitance parameters.

Part Context

This model belongs to the QT49S series of surface-mount crystals from QST, designed to replace traditional through-hole HC-49U components. The series offers various frequency options within the 6 MHz to 48 MHz range, catering to general-purpose timing applications. The SMD variant facilitates higher density board layouts while maintaining electrical performance comparable to legacy packages.

Replacement Considerations

Direct substitutes include other manufacturers' HC-49SMD crystals with identical 24.576 MHz frequency, 12 pF load capacitance, and similar ESR ratings. Verify pin compatibility and thermal characteristics when swapping brands. Generic equivalents may vary in long-term frequency drift and aging rates.