QT49S-15.360MEEJ-T

Overview

The QST QT49S-15.360MEEJ-T is a surface-mount MHz crystal resonator designed for precise frequency generation in electronic circuits. It operates at a nominal frequency of 15.36 MHz with a fundamental oscillation mode. The component features an HC-49/US compatible SMD package measuring 12.7mm x 4.8mm x 3.8mm. Key electrical parameters include a load capacitance of 18pF and an equivalent series resistance of 30 Ohms. Frequency stability and tolerance are both rated at ±10ppm at 25°C, with an operating temperature range spanning from -20°C to +70°C.

Feature Summary

• Surface mount construction utilizing the standard HC-49/US footprint dimensions for automated assembly compatibility.
• Fundamental mode operation providing stable oscillation at 15.36 MHz with specified ±10ppm frequency tolerance.
• Designed for reliable performance within a commercial temperature range of -20°C to +70°C.

Applications

• Microcontroller clock sources requiring 15.36 MHz input
• Digital signal processing circuit timing references
• Communication module oscillator stages

Procurement Notes

Verify the manufacturer designation on official datasheets, as distributor listings may attribute this part number to multiple brands including TXC. Confirm that the specific suffix corresponds to the surface mount variant with the stated 18pF load capacitance and 30 Ohm ESR. Ensure the requested quantity matches the actual packaging specifications provided by the authorized supplier rather than generic inventory counts.

Selection Notes

Select this component when a 15.36 MHz frequency is required for digital logic or communication interfaces. The HC-49/US SMD form factor allows for direct replacement in designs originally intended for through-hole crystals, provided the PCB layout supports the surface mount pads. Consider the ±10ppm stability requirement against system timing constraints before finalizing the design.

Part Context

This crystal belongs to the family of surface-mount quartz resonators commonly used in consumer electronics and industrial control systems. The HC-49/US style has been adapted for surface mounting to reduce profile height while maintaining mechanical robustness. These components serve as primary timekeeping elements in microprocessor-based systems where accurate clock synchronization is critical for data integrity.

Replacement Considerations

Direct substitutes must match the 15.36 MHz frequency, 18pF load capacitance, and HC-49/US SMD dimensions. Verify that alternative manufacturers offer identical ±10ppm stability and 30 Ohm ESR specifications to ensure circuit compatibility without retuning.