QT49S-10.000MEEJ-T

Overview

The QT49S-10.000MEEJ-T is a surface-mount quartz crystal manufactured by QST, designed for precise frequency control in electronic circuits. It operates at a nominal frequency of 10 MHz with a frequency stability and tolerance of ±10 ppm. The component features a load capacitance of 18 pF and an equivalent series resistance (ESR) of 40 Ohms. It utilizes the HC-49/US package style, measuring 12.7 mm in length, 4.8 mm in width, and 3.8 mm in height. The device supports fundamental mode operation and functions within a temperature range of -20°C to +70°C.

Feature Summary

• Surface-mount construction utilizing the HC-49/US form factor for automated assembly compatibility
• Fundamental mode oscillation providing stable frequency generation at 10 MHz
• Designed for industrial temperature environments ranging from -20°C to +70°C

Applications

• Microcontroller clock sources requiring stable timing references
• Communication equipment local oscillators
• Digital signal processing circuit synchronization

Procurement Notes

Verify that the specific application circuit matches the 18 pF load capacitance specification to ensure accurate frequency performance. Confirm that the operating environment remains within the stated -20°C to +70°C temperature limits. Ensure PCB layout accommodates the HC-49/US surface-mount footprint dimensions of 12.7 x 4.8 mm. Check RoHS compliance status if environmental regulations apply to the final product assembly.

Selection Notes

Select this component when a 10 MHz fundamental frequency with ±10 ppm stability is required in a surface-mount format. Consider the 40 Ohm ESR value for oscillator circuit design to guarantee reliable startup. Evaluate the HC-49/US package size against available board space constraints. Compare against other crystals if wider temperature ranges or different load capacitances are necessary for the specific system design.

Part Context

This part belongs to the QT49S series of quartz crystals produced by QST. The series offers various frequency options within the same physical package style. These components are commonly used as primary timekeeping elements in consumer electronics and industrial control systems where moderate accuracy and cost-effectiveness are prioritized over high-stability requirements found in oven-controlled oscillators.

Replacement Considerations

Direct parameter-equivalent substitutes include parts from other manufacturers offering identical 10 MHz frequency, 18 pF load capacitance, and HC-49/US SMD packaging. Verify that any replacement maintains the same ±10 ppm stability and 40 Ohm ESR specifications to ensure circuit compatibility without redesign.