QT49S-3.6864MAAJ-T

Overview

The QST QT49S-3.6864MAAJ-T is a surface-mount quartz crystal resonator operating at a nominal frequency of 3.6864 MHz. It utilizes an HC-49/US style package with dimensions of 12.7 mm in length, 4.8 mm in width, and 3.8 mm in height. The component features a load capacitance of 18 pF and offers a frequency tolerance and stability of ±30 ppm. It operates within a temperature range of -40°C to +85°C and includes a series resistance of 150 Ohms.

Feature Summary

• Surface-mount construction for automated assembly
• HC-49/US form factor compatibility
• Stable frequency generation at 3.6864 MHz

Applications

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

Procurement Notes

Verify the specific suffix 'AAJT' against official QST documentation to confirm exact electrical characteristics and pin configuration. Ensure the selected variant matches the required load capacitance and tolerance specifications for the target circuit design before finalizing procurement orders.

Selection Notes

Select this component when a standard HC-49 footprint is required in a surface-mount application. The 18 pF load capacitance suits circuits designed for this specific value. Consider the ±30 ppm tolerance for general-purpose timing applications where high precision is not critical.

Part Context

This part belongs to the QT49S series of surface-mount crystals from QST. It serves as a compact alternative to through-hole HC-49/U crystals, maintaining similar electrical performance while enabling smaller PCB layouts and reflow soldering processes.

Replacement Considerations

Compatible substitutes include the TXC QT49S-3.6864MAHJ-T and other manufacturers' HC-49 SMD variants with identical 3.6864 MHz frequency, 18 pF load capacitance, and ±30 ppm tolerance.