QT49-28.63636MEEJ-B

Overview

The QT49-28.63636MEEJ-B is a through-hole quartz crystal resonator manufactured by QST, designed for precise frequency generation in electronic circuits. It operates at a nominal frequency of 28.63636 MHz with a load capacitance of 18 pF and an equivalent series resistance (ESR) of 30 Ω. The component exhibits a frequency tolerance and stability of ±10 ppm at room temperature. It features an HC-49/US package with body dimensions of 11.5 x 5 x 3.68 mm and supports an operating temperature range from -20°C to +70°C.

Feature Summary

• Through-hole mounting configuration for standard PCB assembly
• High frequency stability within ±10 ppm tolerance
• Standard HC-49/US package form factor

Applications

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

Procurement Notes

Verify the specific suffix MEEJ-B against official QST documentation to confirm pin configuration and lead finish specifications. Ensure the required load capacitance matches the target circuit design before procurement. Cross-reference the ESR value with oscillator driver strength requirements to prevent over-driving or failure to start.

Selection Notes

Select this component when a stable 28.63636 MHz reference is required for through-hole applications. Consider the ±10 ppm tolerance for precision timing needs. Evaluate the -20°C to +70°C temperature range against environmental conditions. Confirm compatibility with the host oscillator circuit's load capacitance requirements.

Part Context

This part belongs to the QT49 series of quartz crystals from QST, utilizing the widely adopted HC-49/US housing. The series offers various frequencies while maintaining consistent electrical characteristics such as ESR and load capacitance. This specific model provides a non-standard frequency optimized for certain baud rate calculations or pixel clocking applications.

Replacement Considerations

Direct substitutes must match the 28.63636 MHz frequency, 18 pF load capacitance, and HC-49/US package. Verify that alternative manufacturers offer comparable ±10 ppm stability and similar ESR values to ensure circuit compatibility without redesign.