QT49S-6.144MAHJ-T

Overview

The QT49S-6.144MAHJ-T is a surface-mount quartz crystal resonator manufactured by QST. It operates at a fundamental frequency of 6.144 MHz with a frequency tolerance of ±30 ppm. The component utilizes an HC-49/US metal can package, measuring 12.7 x 4.8 x 3.8 mm. It features a load capacitance of 18 pF and a series resistance of 80 Ohms. This SMD type crystal is designed for digital applications requiring stable frequency generation.

Feature Summary

• Resistance welded metal can construction
• Surface mount design compatible with automated assembly
• High stability quartz resonator element

Applications

• Digital clock signal generation
• Microcontroller oscillator circuits
• Communication interface timing

Procurement Notes

Verify the specific suffix 'MAHJ-T' to ensure correct frequency and packaging specifications. Confirm that the HC-49/US SMD footprint matches the PCB layout requirements. Check manufacturer datasheets for reflow soldering profile recommendations to prevent mechanical stress on the metal can during assembly processes.

Selection Notes

Select this component when a 6.144 MHz reference is required in a compact surface-mount form factor. The ±30 ppm tolerance suits general-purpose digital logic applications. Ensure the 18 pF load capacitance aligns with the host circuit's oscillator design parameters before integration into the final system architecture.

Part Context

This part belongs to the QT49S family of SMD crystals from QST. The family offers various frequencies within the 3.2 MHz to 90 MHz range. All units share the HC-49/US metal can package style, providing a standardized footprint for designers migrating through different frequency options within the same product line.

Replacement Considerations

Direct substitutes include other QT49S variants with identical package dimensions but different frequencies, such as QT49S-16.000MAHJ-T. Cross-brand replacements require matching the 12.7 x 4.8 x 3.8 mm footprint, 18 pF load capacitance, and 80 Ohm series resistance to ensure electrical compatibility.