QT49S-12.000MEEJ-T

Overview

QT49S-12.000MEEJ-T is a quartz crystal resonator manufactured by QST, designed for surface-mount applications. It operates at a nominal frequency of 12 MHz with a fundamental oscillation mode. The component features a load capacitance of 18 pF and an equivalent series resistance (ESR) of 40 Ohms. Frequency stability and tolerance are both specified at ±10 ppm. The device is housed in an HC-49/US package, measuring 12.7 mm in length, 4.8 mm in width, and 3.8 mm in height. It supports an operating temperature range from -20°C to +70°C.

Feature Summary

• Surface-mount design utilizing the standard HC-49/US package form factor
• Fundamental mode operation ensuring stable resonance characteristics
• Compliant with RoHS3 specifications for environmental safety

Applications

• Microcontroller clock source circuits
• Communication module timing references
• Digital signal processing system synchronization

Procurement Notes

Verify that the specific suffix MEEJ-T matches the required load capacitance and frequency tolerance for your circuit design. Confirm package dimensions align with PCB footprint constraints. Check current availability status as supply levels may vary. Ensure compliance with REACH regulations if applicable to your region. Validate that the operating temperature range meets your environmental requirements.

Selection Notes

Select this component when a 12 MHz fundamental frequency with ±10 ppm stability is required for surface-mount assembly. The 18 pF load capacitance must match the oscillator circuit design parameters. Consider the HC-49/US package size for board space limitations. Evaluate the -20°C to +70°C operating range against environmental conditions. Compare ESR values with other available options to ensure compatibility with drive level specifications.

Part Context

The QT49S series represents QST's line of high-stability quartz crystals optimized for modern electronic devices. This model specifically targets applications requiring precise timing without the need for complex packaging solutions. The HC-49/US format remains a widely adopted standard in the industry, facilitating easy integration into existing designs. The product adheres to strict manufacturing standards to ensure consistent performance across production batches.

Replacement Considerations

Public confirmed substitute part numbers include QT49S-12.000MAAJ-T. Verify parameter equivalence before substitution.