QT49S-13.560MAAJ-T

Overview

The QT49S-13.560MAAJ-T is a surface-mount quartz crystal resonator manufactured by QST Products, LLC. It operates at a nominal frequency of 13.56 MHz with a frequency tolerance and stability of ±30 ppm. The component utilizes an HC-49/US package configuration, featuring dimensions of approximately 12.7 mm in length, 4.8 mm in width, and 3.8 mm in height. It is designed for fundamental mode operation with a load capacitance of 18 pF and an equivalent series resistance (ESR) of 40 Ohms. The device supports a standard operating temperature range of -20°C to +70°C.

Feature Summary

• Standard SMD HC-49/US package design for direct PCB footprint compatibility
• Fundamental resonance mode operation optimized for stable clock generation
• Compliant with RoHS environmental standards for lead-free manufacturing

Applications

• RFID reader circuits requiring 13.56 MHz carrier frequencies
• NFC (Near Field Communication) system oscillators
• Wireless communication device clock sources

Procurement Notes

Verify the specific suffix 'MAAJ' against the manufacturer's current part number guide to ensure correct pinout and loading capacitor specifications. Confirm that the HC-49/US form factor matches the target PCB silkscreen and pad layout prior to finalizing procurement orders.

Selection Notes

Select this component when a standard 13.56 MHz reference is required for consumer-grade wireless applications. Ensure the circuit design accounts for the 18 pF load capacitance requirement to maintain the specified ±30 ppm stability. Verify that the ambient operating environment remains within the -20°C to +70°C range for optimal performance.

Part Context

This part belongs to the QT49S series of surface-mount crystals from QST. These components are widely utilized as timing references in compact electronic devices where space constraints necessitate SMD packaging over traditional through-hole alternatives.

Replacement Considerations

Public confirmed substitutes include ABL-13.560MHZ-B4Y-T from Abracon LLC and 9C-13.560MAAJ-T from TXC Corporation. Both offer identical 13.56 MHz frequency and HC-49/US package compatibility.