QT49S-5.000MBBK-T

Overview

The QT49S-5.000MBBK-T is a surface-mount quartz crystal oscillator from the QT49S series, manufactured by QST. It operates at a nominal frequency of 5 MHz with a fundamental mode of oscillation. The component features a resistance-welded metal can package in the HC-49/US SMD form factor, measuring approximately 12.7 x 4.8 x 3.8 mm. It offers a frequency tolerance of ±50 ppm at 25°C and a load capacitance of 20 pF. The device is designed for digital applications requiring stable clock signals.

Feature Summary

• Resistance-welded hermetically sealed metal can construction
• Surface mount HC-49/US package design
• RoHS compliant and lead-free manufacturing

Applications

• Television sets
• Set-top boxes
• Cable modems
• Microprocessors
• Computer peripherals

Procurement Notes

Verify the specific ordering suffix to confirm frequency tolerance and stability ratings, as variations exist within the QT49S series. Ensure compatibility with standard RoHS reflow soldering profiles. Confirm that the selected variant matches the required load capacitance and drive level specifications for the target circuit design before finalizing procurement.

Selection Notes

Select this component when a surface-mount solution is required for 5 MHz timing applications. The HC-49/US SMD package provides a balance between size and performance compared to through-hole alternatives. Consider the ±50 ppm tolerance sufficient for general-purpose digital logic clocks. Verify that the application environment does not exceed the specified operating temperature range for the selected stability grade.

Part Context

The QT49S series represents a line of low-profile surface-mount crystals designed to replace traditional through-hole HC-49/U components. These devices utilize AT-cut quartz resonators to ensure frequency stability over temperature variations. The series supports frequencies ranging from 3.2 MHz to 90 MHz, catering to various digital communication and computing standards.

Replacement Considerations

Direct replacements include other manufacturers' HC-49/US SMD crystals with identical 5 MHz frequency, 20 pF load capacitance, and ±50 ppm tolerance. Ensure substitute parts maintain the same physical footprint and pin configuration to fit existing PCB layouts without modification.