QT49-4.194304MAHE-B

Overview

The QST QT49-4.194304MAHE-B is a through-hole crystal oscillator operating at a nominal frequency of 4.194304 MHz. It features a load capacitance of 12 pF and an equivalent series resistance (ESR) of 150 Ohms. The component maintains a frequency stability of ±30 ppm across the operating temperature range and ±30 ppm at 25°C. It utilizes the HC-49/US package format, ensuring compatibility with standard mounting configurations for timing applications.

Feature Summary

• Provides precise timing signals via quartz crystal resonance
• Designed for through-hole mounting on printed circuit boards
• Maintains stable frequency output under specified thermal conditions

Applications

• Microcontroller clock sources
• Digital logic timing circuits
• Communication interface synchronization

Procurement Notes

Verify that the specific suffix HE-B corresponds to the required load capacitance and ESR specifications for your design. Confirm RoHS compliance status if environmental regulations apply. Ensure the HC-49/US footprint matches the target PCB layout before ordering.

Selection Notes

Select this component when a 4.194304 MHz reference is required with 12 pF load capacitance. Consider the ±30 ppm stability requirement against system tolerance needs. Evaluate the 150 Ohm ESR impact on oscillator circuit drive level and startup reliability.

Part Context

This part belongs to the QT49 series of HC-49/US crystals manufactured by QST. Similar variants in this family include different frequencies and load capacitances, such as the QT49-4.000MAAK-B which uses 20 pF load capacitance. The series provides standardized timing solutions for various electronic applications.

Replacement Considerations

Direct substitutes must match the 4.194304 MHz frequency, 12 pF load capacitance, and HC-49/US package. Verify ESR limits and stability ratings to ensure circuit compatibility. Cross-reference with other manufacturers offering identical electrical parameters.