QT49-10.000MAAJ-B

Overview

The QT49-10.000MAAJ-B is a fundamental mode quartz crystal resonator manufactured by QST, designed for through-hole mounting in the HC-49/US package. It operates at a nominal frequency of 10 MHz with a load capacitance of 18 pF and an equivalent series resistance (ESR) of 40 Ohms. The component provides a frequency stability of ±30 ppm and a tolerance of ±30 ppm. It functions within a temperature range of -20°C to +70°C.

Feature Summary

• Fundamental mode oscillation utilizing a standard HC-49/US through-hole package for reliable mechanical mounting.
• Stable timing performance maintained across a defined industrial temperature range of -20°C to +70°C.
• Designed for compatibility with standard oscillator circuits requiring an 18 pF load capacitance.

Applications

• Microcontroller clock generation
• Communication module timing references
• General-purpose digital circuit synchronization

Procurement Notes

Verify the specific suffix 'B' against the manufacturer's current datasheet to confirm package dimensions and termination style. Ensure the required load capacitance matches the target circuit design, as mismatched capacitance affects frequency accuracy. Confirm that the operating temperature range meets the environmental requirements of the final application before integration.

Selection Notes

Select this component when a standard through-hole crystal is required for 10 MHz applications. Compare ESR values against the oscillator driver strength to ensure stable startup. Consider the HC-49/US form factor for PCB space constraints and verify that the ±30 ppm stability aligns with system timing precision needs.

Part Context

This part belongs to the QT49 series of fundamental mode crystals from QST. It shares the HC-49/US footprint with other variants in the line but differs in frequency and stability specifications. The series supports various load capacitances and temperature ranges, allowing designers to choose based on specific circuit requirements.

Replacement Considerations

Direct substitutes include the QT49-10.000MEEJ-B, which offers improved ±10 ppm stability but may have different ESR characteristics. Other manufacturers producing HC-49/US 10 MHz crystals with 18 pF load capacitance can be considered if pin compatibility and electrical parameters are verified.