QT49-24.576MAAJ-B

Overview

The QST QT49-24.576MAAJ-B is a through-hole quartz crystal resonator operating at a fundamental frequency of 24.576 MHz. It features a frequency tolerance and stability of ±30 ppm at 25°C, with an extended stability range of ±30 ppm across temperatures from -20°C to +70°C. The component utilizes an HC-49/US package with dimensions of 11.5 mm x 5 mm x 3.68 mm. Key electrical parameters include a load capacitance of 18 pF and an equivalent series resistance (ESR) of 30 Ohms. It is RoHS compliant and operates in the fundamental mode.

Feature Summary

• Fundamental mode operation for precise frequency generation
• HC-49/US through-hole package design for standard mounting
• Stable frequency performance across industrial temperature ranges

Applications

• Microcontroller clock sources
• Communication interface timing circuits
• Digital signal processing systems

Procurement Notes

Verify that the target application supports through-hole assembly techniques compatible with the HC-49/US package dimensions. Confirm that the circuit design accommodates the specified 18 pF load capacitance and 30 Ohm ESR to ensure oscillation stability. Ensure the operating environment remains within the documented -20°C to +70°C range to maintain the guaranteed ±30 ppm frequency stability specification.

Selection Notes

Select this component when a through-hole solution is required for 24.576 MHz applications. Compare against surface-mount alternatives if board space is limited. Verify that the ±30 ppm tolerance meets the system's timing accuracy requirements. Consider the physical size constraints of the HC-49/US package relative to other available crystal packages.

Part Context

This part belongs to the QST QT49 series of general-purpose quartz crystals. It shares the HC-49/US form factor with other variants in the lineup, differing primarily in frequency and specific tolerance grades. The series is designed for cost-effective timing solutions in consumer and industrial electronics requiring reliable fundamental mode resonance.

Replacement Considerations

Direct substitutes must match the 24.576 MHz frequency, HC-49/US package, 18 pF load capacitance, and ±30 ppm tolerance. Examples include equivalent parts from manufacturers offering HC-49/US crystals with identical electrical characteristics. Verify pin compatibility and thermal specifications before substitution.