QT49S-19.660MBBK-T

Overview

The QT49S-19.660MBBK-T is a surface-mount crystal oscillator manufactured by QST, operating at a fundamental frequency of 19.66 MHz. It features a resistance-welded metal can package designed for SMD applications. The component exhibits a frequency stability of ±50 ppm and an equivalent series resistance of 30 Ohms. It supports a load capacitance of 20 pF and operates within a temperature range of -20°C to +70°C. The device utilizes the HC-49/US form factor adapted for surface mount technology, ensuring reliable performance in digital circuits requiring precise timing references.

Feature Summary

• Resistance-welded metal can construction for enhanced durability
• Surface mount design compatible with automated assembly processes
• High frequency stability suitable for precision digital applications

Applications

• Digital clock generation circuits
• Microcontroller system timing references
• Communication interface synchronization

Procurement Notes

Verify manufacturer origin as listings indicate both TXC and QST branding for this part number. Confirm RoHS compliance status and specific packaging details such as reel quantity before ordering. Ensure the supplier provides official datasheets matching the QT49S series specifications to guarantee electrical parameter accuracy.

Selection Notes

Select this component when a 19.66 MHz surface-mount crystal with ±50 ppm stability is required. Consider the HC-49/US footprint compatibility for PCB layout. Evaluate thermal requirements against the -20°C to +70°C operating range. Compare equivalent series resistance values with circuit drive level constraints to ensure optimal oscillation startup.

Part Context

This part belongs to the QT49S series of surface-mount crystals. The series offers various frequencies ranging from 3.2 MHz to 90 MHz. These components are designed to replace through-hole HC-49/U crystals in modern compact electronics. The series emphasizes reliability through resistance-welded sealing techniques.

Replacement Considerations

Direct substitutes include other manufacturers' HC-49/SMD crystals with identical 19.66 MHz frequency and 20 pF load capacitance. Verify pinout compatibility and mechanical dimensions match the existing footprint. Check if alternative brands offer tighter stability tolerances if required by the application.