QT49S-4.194304MBBK-T

Overview

The QT49S-4.194304MBBK-T is a fundamental mode quartz crystal resonator manufactured by QST Products, LLC. It operates at a nominal frequency of 4.194304 MHz with a frequency tolerance and stability of ±50 ppm. The component features a load capacitance of 20 pF and an equivalent series resistance (ESR) of 150 Ohms. It is housed in an HC-49/US metal can package designed for surface mount or through-hole applications depending on the specific variant configuration. The device supports an operating temperature range from -20°C to +70°C, ensuring reliable performance in standard commercial environments.

Feature Summary

• Fundamental mode quartz crystal operation providing stable frequency generation
• HC-49/US metal can package construction for mechanical durability
• Designed for use in oscillator circuits requiring precise timing references

Applications

• Microcontroller clock sources
• Communication equipment timing circuits
• Consumer electronics oscillators

Procurement Notes

Verify the exact package type and termination style against the manufacturer's datasheet before ordering, as HC-49/US variants may differ in mounting requirements. Confirm that the ±50 ppm stability meets your system's timing accuracy needs. Ensure the 20pF load capacitance matches your circuit design specifications to maintain frequency precision.

Selection Notes

Select this component when a fundamental mode crystal with moderate stability is required. The HC-49/US form factor offers a balance between size and power handling. Consider the ESR value of 150 Ohms for oscillator loop gain calculations. This part is suitable for general-purpose timing applications where high-frequency stability is not critical.

Part Context

This crystal belongs to the QT49S series from QST, which utilizes standard HC-49/US packaging. The series provides various frequency options for common microcontroller and communication interfaces. The specific model indicates a 4.194304 MHz output, often used in baud rate generation or specific clock division applications within digital systems.

Replacement Considerations

Direct substitutes include other manufacturers' HC-49/US crystals with identical 4.194304 MHz frequency, 20pF load capacitance, and ±50 ppm stability. Verify that replacement parts meet the same ESR and temperature range specifications to ensure circuit compatibility.