QT49S-4.096MAHJ-T

Overview

The QT49S-4.096MAHJ-T is a surface-mount quartz crystal resonator manufactured by QST. It operates at a fundamental frequency of 4.096 MHz with a load capacitance of 18 pF and an equivalent series resistance of 150 Ohms. The component features a tolerance and stability of ±30 ppm. It utilizes the HC-49/US form factor, measuring 12.7 x 4.8 x 3.8 mm. The unit supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Surface mount construction in standard HC-49/US package
• Fundamental mode quartz resonator operation
• Wide industrial temperature rating for environmental resilience

Applications

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

Procurement Notes

Verify the specific suffix 'MAHJ' against official QST documentation to confirm pin configuration and soldering profile compatibility. Ensure the selected variant matches the required 150 Ohm ESR specification for circuit design integrity. Cross-reference the datasheet revision date to validate current manufacturing status and material compliance information before finalizing procurement orders.

Selection Notes

Select this component when a precise 4.096 MHz reference is required in a space-constrained surface-mount layout. The HC-49/US footprint allows for easy transition from through-hole designs without significant PCB rework. Consider the ±30 ppm stability limit against system timing requirements to ensure adequate performance margins under varying thermal conditions.

Part Context

This model belongs to the QT49S series of surface-mount crystals from QST. The series maintains the mechanical dimensions of traditional HC-49/U cans while adapting them for automated SMT assembly processes. Other variants in this family offer different frequencies such as 16 MHz or 25 MHz, sharing similar electrical characteristics and package constraints.

Replacement Considerations

Direct substitutes must match the 4.096 MHz frequency, 18 pF load capacitance, and HC-49/US outline. Verify ESR compatibility, as the original specifies 150 Ohms. Alternative manufacturers may offer identical specifications but require validation of drive level sensitivity and aging rates.