QT49S-13.560MAHJ-T

Overview

The QT49S-13.560MAHJ-T is a quartz crystal resonator manufactured by QST, designed for surface-mount applications. It operates at a fundamental frequency of 13.56 MHz with a load capacitance of 18 pF and an equivalent series resistance (ESR) of 40 Ohms. The component exhibits a frequency tolerance and stability of ±30 ppm across the operating temperature range of -20°C to +70°C. It utilizes the HC-49/US package style, measuring 12.7 mm in length, 4.8 mm in width, and 3.8 mm in height. This device is RoHS compliant and classified under ECCN EAR99.

Feature Summary

• Surface-mount construction utilizing the HC-49/US package format for automated assembly integration.
• Fundamental mode operation providing stable resonance at 13.56 MHz with low ESR characteristics.
• Compliant with RoHS3 directives and REACH regulations for environmental safety standards.

Applications

• RFID reader antenna circuits
• Wireless communication interface modules
• Industrial automation control systems

Procurement Notes

Verify the specific suffix 'H' against the official QST datasheet to confirm the exact pin configuration and soldering profile requirements for the SMD variant. Ensure that the 18pF load capacitance matches the oscillator circuit design specifications to maintain the required ±30ppm stability. Confirm that the operating temperature range of -20°C to +70°C aligns with the intended application environment before finalizing procurement orders.

Selection Notes

Select this component when a standard 13.56 MHz frequency is required for contactless communication protocols such as ISO 14443 or ISO 15693. The HC-49/US form factor allows for compatibility with existing footprint designs while transitioning from through-hole to surface-mount processes. Consider the ±30ppm stability limit when designing clock sources for timing-sensitive digital interfaces where higher precision crystals are not mandated by the system architecture.

Part Context

This part belongs to the QT49S series of quartz crystals produced by QST Products, LLC. The series offers various frequency options within the HF range, packaged in standardized SMD dimensions. The QT49S designation indicates a specific mechanical outline derived from the traditional HC-49/U can style but adapted for modern PCB mounting techniques, ensuring mechanical robustness alongside electrical performance.

Replacement Considerations

The ABL-13.560MHZ-B4Y-T from Abracon LLC is documented as a similar replacement option. Verify that the substitute maintains identical frequency, load capacitance, and physical dimensions to ensure board compatibility without redesign.