QT49S-13.824MAAJ-T

Overview

The QT49S-13.824MAAJ-T is a surface-mount quartz crystal oscillator manufactured by QST Corporation, operating at a fundamental frequency of 13.824 MHz. This component features a frequency stability and tolerance of ±30 ppm, ensuring precise timing performance for digital applications. It utilizes an HC-49 SMD package with body dimensions of approximately 12.7mm x 4.8mm x 3.8mm. The device supports a load capacitance of 18 pF and operates within a temperature range of -20°C to +70°C. Designed for fundamental mode operation, it provides reliable clock signals for high-speed data transmission and processing circuits.

Feature Summary

• Surface-mount design in compact HC-49 package
• Fundamental mode operation for stable frequency generation
• ±30 ppm frequency stability and tolerance
• Optimized for 18 pF load capacitance

Applications

• Set-top boxes (STB)
• Cable modems
• Television systems
• Digital signal processing units

Procurement Notes

Verify the specific suffix 'AAJ' against official QST documentation to confirm pin configuration and loading capacitance requirements. Ensure the selected variant matches the required operating temperature range of -20°C to +70°C for the intended application environment. Cross-reference the HC-49 SMD footprint with PCB layout guidelines to guarantee proper soldering and mechanical stability during assembly processes.

Selection Notes

Select this component when a 13.824 MHz reference clock is required for cable modem or STB applications. The HC-49 SMD form factor offers space efficiency compared to through-hole alternatives while maintaining robust performance. Consider the ±30 ppm stability specification against system jitter requirements. Verify that the 18 pF load capacitance aligns with the host oscillator circuit design to ensure accurate frequency output without external trimming.

Part Context

This part belongs to the QT49S series of surface-mount crystals from QST, covering frequencies from 3.2 MHz to 90 MHz. The series is engineered for consumer electronics and telecommunications equipment requiring compact, reliable timing solutions. The 13.824 MHz variant specifically targets digital video and broadband communication interfaces where standard baud rates are derived from this base frequency.

Replacement Considerations

Compatible substitutes include the TXC QT49S-13.824MAAJ-T, which shares identical electrical specifications and package dimensions. Verify that alternative sources maintain the same ±30 ppm stability and 18 pF load capacitance. Ensure the replacement part adheres to the same HC-49 SMD mechanical outline to fit existing PCB footprints without redesign.