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The QT49S-16.000MEEJ-T is a surface-mount quartz crystal resonator manufactured by QST, operating at a nominal frequency of 16 MHz. It features an HC-49/US style package with dimensions of 12.7 x 4.8 x 3.8 mm. The component supports a load capacitance of 18 pF and offers a frequency stability of ±10 ppm and a tolerance of ±10 ppm.
Verify the specific manufacturer designation, as this part number appears in listings from both QST and TXC Corporation. Confirm the exact package dimensions and load capacitance requirements against your schematic to ensure compatibility with your oscillator circuit design before ordering.
Select this component when a standard 16 MHz surface-mount crystal is required. Ensure the PCB layout accommodates the 12.7 x 4.8 mm footprint. Verify that the system oscillator circuit is designed for an 18 pF load capacitance to achieve the specified ±10 ppm stability.
This part belongs to the QT49S series of surface-mount crystals. It serves as a direct replacement for through-hole HC-49/US crystals in modern compact electronics, providing reliable timing signals while reducing board space consumption compared to traditional leaded packages.
Direct substitutes include other manufacturers' 16 MHz SMD crystals with identical 12.7 x 4.8 mm dimensions and 18 pF load capacitance. Cross-reference with TXC Corporation equivalents if supply chain diversification is needed.