QT49-54.000MAAJ-B

Overview

The QT49-54.000MAAJ-B is a MHz crystal manufactured by QST, operating at a nominal frequency of 54 MHz with a stability and tolerance of ±30ppm. It features an 18pF load capacitance and an equivalent series resistance (ESR) of 80 Ohms. Designed for through-hole mounting, the component utilizes the HC-49/US package style, measuring 11.5x5x3.68mm. The device supports a base harmonic operating mode and functions within a temperature range of -20°C to +70°C.

Feature Summary

• Through-hole mounting configuration in standard HC-49/US package
• Base harmonic operation mode for stable signal generation
• Defined electrical parameters including 18pF load capacitance and 80 Ohms ESR

Applications

• General-purpose clock signal generation in electronic circuits
• Frequency reference sources for microcontroller systems
• Timing applications requiring through-hole assembly compatibility

Procurement Notes

Verify that the required mounting method aligns with through-hole PCB technology, as this component is not suitable for surface-mount processes. Confirm that the operational temperature range of -20°C to +70°C meets the environmental requirements of the target application. Ensure the circuit design accommodates the specified 18pF load capacitance and 80 Ohms ESR to maintain the stated ±30ppm frequency stability. Cross-reference the HC-49/US package dimensions with existing board layouts to ensure proper fitment during assembly.

Selection Notes

Select this component when a through-hole crystal is required for 54 MHz applications. The HC-49/US package offers robust mechanical stability compared to smaller surface-mount alternatives. Consider the ±30ppm tolerance if high precision is not critical. Verify that the -20°C to +70°C temperature range covers the intended operating environment. This part is suitable for cost-sensitive designs where manual or wave soldering is preferred over SMT processes.

Part Context

This part belongs to the QST crystal product line, specifically designed for general timing needs. The QT49 series typically utilizes the widely adopted HC-49/US form factor, ensuring compatibility with standard through-hole footprints found in many legacy and industrial electronics. The 54 MHz frequency places it in a niche category compared to more common clock speeds like 32.768 kHz or 16 MHz.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.