QT49S-20.000MEEJ-T

Overview

The QT49S-20.000MEEJ-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precise frequency control in electronic circuits. It operates at a nominal frequency of 20 MHz with a frequency stability and tolerance of ±10 ppm at 25°C. The component features a load capacitance of 18 pF and an equivalent series resistance (ESR) of 30 Ohms. It utilizes the HC-49/US form factor adapted for surface mount technology, with physical dimensions of 12.7 x 4.8 x 3.8 mm. The device supports an operating temperature range from -20°C to +70°C, ensuring reliable performance in standard commercial applications.

Feature Summary

• Surface-mount quartz crystal design for automated assembly processes
• High frequency stability of ±10 ppm for accurate timing references
• Standardized HC-49/US footprint optimized for space-constrained PCB layouts

Applications

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

Procurement Notes

Verify that the specific suffix EEEJ corresponds to the required surface-mount variant and temperature range. Confirm that the 18 pF load capacitance matches the oscillator circuit requirements. Ensure the ±10 ppm stability meets system timing accuracy specifications. Check for RoHS compliance status if required by project standards. Validate package dimensions against PCB footprint constraints before ordering.

Selection Notes

Select this component when a 20 MHz reference is required in a surface-mount configuration. Consider the ±10 ppm stability for general-purpose digital logic timing. Evaluate the -20°C to +70°C range against environmental conditions. Compare ESR values with oscillator drive level capabilities. Ensure compatibility with existing board space limitations due to the HC-49/US SMD profile.

Part Context

This part belongs to the QT49S series of quartz crystals from QST, which offers various frequency options and mounting styles. The series includes through-hole and surface-mount variants with different stability grades. This specific model represents the surface-mount adaptation of the traditional HC-49/U can style, maintaining similar electrical characteristics while enabling modern PCB assembly techniques.

Replacement Considerations

• QT49S-20.000MAAE-T
• QT49S-20.500MAAJ-T

FAQ

What is the physical package type of the QT49S-20.000MEEJ-T?

It uses a surface-mount version of the HC-49/US package with dimensions of 12.7 x 4.8 x 3.8 mm.

Does this crystal support industrial temperature ranges?

No, the specified operating temperature range is limited to -20°C to +70°C, suitable for commercial applications.