QT49S-10.000MAHJ-T

Overview

The QT49S-10.000MAHJ-T is a surface-mount quartz crystal oscillator from the QT49S series manufactured by QST. It operates at a fundamental frequency of 10 MHz with a frequency stability of ±30 ppm and a load capacitance of 18 pF. The component utilizes an HC-49/US package variant, featuring SMD dimensions of 12.7 mm x 4.8 mm. It exhibits an equivalent series resistance of 40 Ohms and is designed for operation within standard industrial temperature ranges.

Feature Summary

• Surface-mount design compatible with automated assembly processes
• High frequency stability suitable for precision timing applications
• Standardized HC-49/US form factor adaptation for compact PCB layouts

Applications

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

Procurement Notes

Verify the specific suffix MAHJ-T against official QST documentation to confirm exact dimensional tolerances and soldering profile requirements. Ensure compatibility with reflow soldering temperatures specified in the manufacturer datasheet. Cross-reference the load capacitance value with circuit design specifications to maintain frequency accuracy.

Selection Notes

Select this component when a 10 MHz reference signal with ±30 ppm stability is required in a surface-mount configuration. Consider the 18 pF load capacitance requirement for oscillator circuit design. Evaluate the 40 Ohm ESR against driver strength limitations. Compare physical footprint constraints against alternative QT49S variants if space optimization is critical.

Part Context

This part belongs to the QT49S series of quartz crystals, which offers various frequency options and package adaptations. The series provides alternatives with different stability grades and mounting styles. The QT49S line supports diverse electronic designs requiring reliable frequency generation without the need for active oscillator components.

Replacement Considerations

Direct substitutes include other QT49S-10.000 variants with identical electrical parameters but different suffixes indicating minor mechanical or packaging differences. Verify pin compatibility and thermal characteristics before substitution.