QT49S-13.560MEEJ-T

Overview

The QT49S-13.560MEEJ-T is a quartz crystal resonator manufactured by QST, designed for precise frequency control in electronic circuits. It operates at a nominal frequency of 13.56 MHz with a tight frequency tolerance of ±10 ppm at 25°C and ±10 ppm across the temperature range of -20°C to +70°C. The component utilizes an HC-49/US package style and features a load capacitance of 18 pF. It exhibits a series resistance of 40 Ohms, ensuring stable oscillation characteristics suitable for RFID and wireless communication applications requiring high frequency stability.

Feature Summary

• High frequency stability with ±10 ppm tolerance across specified operating temperatures
• Standard HC-49/US through-hole mounting configuration
• Optimized for 13.56 MHz RFID and NFC applications
• Low series resistance of 40 Ohms for efficient circuit integration

Applications

• Radio Frequency Identification (RFID) tags and readers
• Near Field Communication (NFC) devices
• Wireless sensor networks
• Industrial automation control systems

Procurement Notes

Verify the specific suffix EEEJ against official QST documentation to confirm the exact temperature coefficient and tolerance specifications. Ensure compatibility with existing PCB footprints for HC-49/US packages. Cross-reference the load capacitance requirement of 18 pF with the host oscillator circuit design to maintain frequency accuracy within the stated ±10 ppm limits during procurement validation.

Selection Notes

Select this component when strict frequency stability is required for 13.56 MHz operations without significant drift over temperature variations. The HC-49/US package offers robust mechanical protection compared to surface-mount alternatives. Consider the 40 Ohm series resistance when designing drive level constraints to prevent over-driving the crystal. This model is appropriate for applications where long-term frequency aging and environmental stability are critical performance factors.

Part Context

This part belongs to the QT49S series from QST, which focuses on standard frequency crystals for general-purpose and specialized communication interfaces. The series provides various frequency options and tolerance grades. The QT49S-13.560MEEJ-T specifically targets the industrial ISM band at 13.56 MHz, distinguishing itself from lower-stability variants within the same family by offering tighter ppm tolerances.

Replacement Considerations

Direct substitutes must match the 13.56 MHz frequency, 18 pF load capacitance, HC-49/US package, and ±10 ppm stability. Verify that alternative manufacturers offer equivalent series resistance and temperature range specifications to ensure circuit compatibility without redesign.