QT49-4.9152MAAJ-B

Overview

The QST QT49-4.9152MAAJ-B is a quartz crystal resonator designed for through-hole mounting in electronic circuits. It operates at a fundamental frequency of 4.9152 MHz with a frequency stability and tolerance of ±30 ppm across the specified temperature range. The component features a load capacitance of 18 pF and an equivalent series resistance (ESR) of 80 Ohms. It utilizes the standard HC-49/US metal can package, providing robust mechanical protection and consistent electrical performance for general-purpose timing applications.

Feature Summary

• HC-49/US metal can package construction for durability
• Fundamental mode quartz resonance operation
• Standard 18 pF load capacitance compatibility

Applications

• Microcontroller clock generation
• Communication interface timing
• Embedded system oscillators

Procurement Notes

Verify the exact part number suffix to confirm the specific frequency and package variant, as the QT49 series includes multiple options. Ensure the application circuit matches the 18 pF load capacitance requirement. Confirm that the ±30 ppm stability meets the system timing accuracy needs. Check operating temperature specifications against environmental conditions before finalizing procurement.

Selection Notes

Select this component when a standard through-hole crystal with moderate stability is required. The HC-49/US form factor is suitable for prototyping and legacy board designs. Consider the ESR value for oscillator circuit design to ensure reliable startup. Evaluate if the ±30 ppm tolerance is sufficient for the target application's clock precision requirements compared to higher-stability alternatives.

Part Context

This part belongs to the QST QT49 series of quartz crystals, which are widely used in consumer electronics and industrial equipment. The series offers various frequencies within the same physical footprint, allowing for design flexibility. The HC-49/US package is a industry-standard size, ensuring compatibility with common PCB footprints and automated assembly processes.

Replacement Considerations

Compatible substitutes include other manufacturers' HC-49/US crystals with identical 4.9152 MHz frequency, 18 pF load capacitance, and ±30 ppm stability. Verify pin dimensions and lead spacing match the existing PCB layout. Ensure the replacement part supports the same operating temperature range and has comparable ESR characteristics for circuit compatibility.