QT49-48.000MAAJ-B

Overview

The QST QT49-48.000MAAJ-B is a through-hole quartz crystal resonator operating at a fundamental frequency of 48 MHz. It features a standard HC-49/US package with dimensions of 11.5 x 5 x 3.68 mm. The component exhibits a frequency stability and tolerance of ±30 ppm at 25°C, extending to ±30 ppm across the operating temperature range of -20°C to +70°C. Key electrical parameters include a load capacitance of 18 pF and an equivalent series resistance (ESR) of 80 ohms. This device is designed for general-purpose timing applications requiring stable oscillation.

Feature Summary

• HC-49/US through-hole package construction
• Fundamental mode operation at 48 MHz
• ±30 ppm frequency stability specification
• 18 pF load capacitance compatibility

Applications

• Microcontroller clock generation circuits
• Communication interface timing references
• General-purpose oscillator circuits

Procurement Notes

Verify the specific suffix 'MAAJ-B' against official QST documentation to confirm the exact frequency tolerance and temperature range specifications. Ensure the required load capacitance matches the circuit design. Confirm RoHS compliance status if environmental regulations apply to the assembly process. Cross-reference the ESR value with driver circuit capabilities.

Selection Notes

Select this component when a 48 MHz fundamental frequency is required in a standard HC-49/US form factor. Consider the ±30 ppm stability limit for application timing accuracy requirements. Verify that the 18 pF load capacitance aligns with the host oscillator circuit's internal or external capacitor values. Assess the -20°C to +70°C operating range against environmental conditions.

Part Context

This part belongs to the QST QT49 series of quartz crystals, which utilizes the widely adopted HC-49/US housing. The series offers various frequencies and stability grades. The MA suffix typically denotes specific tolerance and packaging characteristics within the manufacturer's lineup. These components are passive resonators used to provide precise timekeeping signals in electronic systems.

Replacement Considerations

Direct substitutes must match the 48 MHz frequency, HC-49/US package, 18 pF load capacitance, and ±30 ppm stability. Verify ESR compatibility with existing driver circuits. Check for identical operating temperature ranges. Alternative manufacturers may offer equivalent performance but require validation of pinout and mechanical dimensions.