QT49-18.432MAAJ-B

Overview

The QST QT49-18.432MAAJ-B is a through-hole quartz crystal resonator designed for precision timing applications. It operates at a nominal frequency of 18.432 MHz with a frequency stability and tolerance of ±30 ppm. The component utilizes an HC-49/US package, measuring 11.5 x 5 x 3.68 mm. Key electrical specifications include a load capacitance of 18 pF and a series resistance of 30 Ohms. It supports an operating temperature range from -20°C to +70°C, ensuring reliable performance in standard digital signal processing environments.

Feature Summary

• Provides stable oscillation at 18.432 MHz for precise clock generation
• Utilizes HC-49/US through-hole packaging for robust mechanical mounting
• Maintains ±30 ppm frequency tolerance across the specified temperature range

Applications

• Precision timing circuits requiring stable clock signals
• Digital signal processing systems
• Microcontroller clock sources

Procurement Notes

Verify that the specific part number QT49-18.432MAAJ-B matches the required 18.432 MHz frequency and HC-49/US package dimensions. Confirm that the ±30 ppm stability and 18 pF load capacitance align with the circuit design requirements. Ensure the operating temperature range of -20°C to +70°C is sufficient for the intended application environment before procurement.

Selection Notes

Select this component when a through-mount solution is required for 18.432 MHz applications. The HC-49/US form factor offers compatibility with standard PCB layouts. Consider the ±30 ppm tolerance if higher precision is not critical. Verify that the 30 Ohm series resistance fits within the oscillator circuit's drive level constraints.

Part Context

This model belongs to the QST QT49 series of quartz crystals. These components are widely used in electronic devices requiring accurate timekeeping or data transmission synchronization. The HC-49/US package is a standard industry format for general-purpose crystal resonators, offering a balance between size and performance for various consumer and industrial electronics.

Replacement Considerations

Compatible substitutes must match the 18.432 MHz frequency, HC-49/US package, 18 pF load capacitance, and ±30 ppm stability. Verify equivalent series resistance and operating temperature ranges to ensure functional interchangeability without circuit redesign.