QT49S-8.192MAHJ-T

Overview

The QT49S-8.192MAHJ-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precise frequency generation in electronic circuits. It operates at a nominal frequency of 8.192 MHz with a frequency stability and tolerance of ±30ppm at 25°C. The component features a load capacitance of 18pF and an equivalent series resistance (ESR) of 80 Ohms. It utilizes the HC-49/US form factor adapted for surface mount technology, with physical dimensions measuring 12.7mm x 4.8mm x 3.8mm. The device supports an operating temperature range from -40°C to +85°C, ensuring reliable performance across various industrial and commercial applications.

Feature Summary

• Surface-mount design compatible with automated assembly processes
• High frequency stability within ±30ppm tolerance
• Robust construction suitable for wide temperature variations

Applications

• Microcontroller clock sources
• Communication module timing references
• Digital signal processing circuits

Procurement Notes

Verify that the specific part number matches the required frequency and package type before ordering. Confirm that the load capacitance and ESR values align with the oscillator circuit design specifications. Ensure the operating temperature range meets the environmental requirements of the final application. Cross-reference the datasheet for any updates on mechanical dimensions or material composition to guarantee compatibility with existing PCB layouts and manufacturing processes.

Selection Notes

Select this component when a stable 8.192 MHz reference is needed in a compact surface-mount footprint. Consider the ±30ppm stability requirement against the system's timing accuracy needs. Evaluate the 18pF load capacitance to ensure proper oscillation with the host circuit. Compare the 80 Ohm ESR against the driver strength capabilities of the target oscillator to prevent over-driving or failure to start.

Part Context

This model belongs to QST's QT49S series of surface-mount crystals, which are engineered as direct replacements for traditional through-hole HC-49/U units. The series offers space-saving advantages while maintaining similar electrical characteristics. The 'MAHJ' suffix typically denotes specific packaging and terminal configuration details defined by the manufacturer. This series is widely used in consumer electronics and industrial control systems requiring reliable timekeeping.

Replacement Considerations

Direct substitutes include other manufacturers' 8.192 MHz SMD crystals with matching 18pF load capacitance and ≤80 Ohm ESR. Verify that alternative parts maintain the same ±30ppm stability and HC-49S-compatible footprint. Check for identical operating temperature ranges to ensure environmental reliability.