QT49S-48.000MAAJ-T

Overview

The QT49S-48.000MAAJ-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precise frequency generation in electronic circuits. It operates at a nominal frequency of 48 MHz with a load capacitance of 18 pF and an equivalent series resistance (ESR) of 80 Ohms. The component exhibits a frequency stability of ±30 ppm at 25°C and maintains this tolerance across the industrial temperature range of -20°C to +70°C. It utilizes the HC-49/US form factor adapted for surface mounting, ensuring compatibility with standard PCB layouts while providing reliable performance for clock source applications.

Feature Summary

• Surface-mount construction compatible with automated assembly processes
• Industrial temperature stability maintaining ±30 ppm accuracy from -20°C to +70°C
• RoHS compliant lead-free manufacturing process

Applications

• PC motherboard clock sources
• Set-top box timing circuits
• Display panel synchronization
• Cable modem communication interfaces

Procurement Notes

Verify that the specific order matches the QT49S-48.000MAAJ-T designation, as suffixes indicate package or tolerance variations. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the design accounts for the 18pF load capacitance requirement to maintain specified frequency accuracy. Cross-reference datasheets for thermal handling specifications during soldering processes.

Selection Notes

Select this component when a 48 MHz surface-mount crystal is required for consumer electronics or industrial control systems. It is suitable for designs needing ±30 ppm stability over a limited industrial temperature range. Consider the HC-49/US footprint compatibility for direct replacement of through-hole variants without PCB redesign. Evaluate ESR requirements against oscillator circuit capabilities to ensure reliable startup.

Part Context

This part belongs to QST's QT49S series of surface-mount quartz crystals. The series offers various frequencies and packages, with the QT49S variant specifically adapting the traditional HC-49/US metal can shape for SMD assembly. This allows designers to utilize familiar mechanical dimensions while transitioning to surface-mount technology for improved production efficiency and space optimization.

Replacement Considerations

Direct substitutes include the QT49S-48.000MBBK-T, which shares similar electrical characteristics but may differ in packaging suffix details. Verify pin compatibility and load capacitance matching before substitution. Alternative manufacturers producing HC-49S 48MHz crystals require validation of ESR and stability parameters against original specifications.