QT49S-8.000MEEJ-T

Overview

The QST QT49S-8.000MEEJ-T is a surface-mount quartz crystal resonator operating at a fundamental frequency of 8 MHz. It features an 18 pF load capacitance and ±10 ppm frequency stability and tolerance at 25°C. The component utilizes HC-49/US package dimensions, measuring 12.7 mm in length, 4.8 mm in width, and approximately 3.8 mm in height. It exhibits an equivalent series resistance (ESR) of 80 Ohms and operates within a temperature range of -20°C to +70°C.

Feature Summary

• Fundamental mode operation for precise timing applications
• Surface mount design compatible with automated assembly processes
• High frequency stability suitable for clock generation circuits

Applications

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

Procurement Notes

Verify the specific suffix 'E' indicates RoHS compliance and 'J' denotes tape and reel packaging configuration. Confirm that the 80 Ohm ESR matches the target oscillator circuit requirements. Ensure the HC-49S footprint aligns with the PCB layout specifications before finalizing procurement orders.

Selection Notes

Select this component when a standard 8 MHz reference is required for space-constrained designs. The 18 pF load capacitance must match the external capacitors in the oscillator circuit to maintain accuracy. Consider the -20°C to +70°C operating range against environmental conditions.

Part Context

This part belongs to the QT49S series of high-accuracy quartz crystals from QST. It serves as a direct replacement for discontinued TXC Corporation parts like the 9C-11.2896MEEJ-T family members with similar electrical characteristics. The series supports various frequencies while maintaining consistent package dimensions.

Replacement Considerations

Public confirmed substitute: None listed.