QT49S-7.500MDGL-T

Crystals Overview

The QT49S-7.500MDGL-T is a surface-mount fundamental quartz crystal operating at a nominal frequency of 7.5 MHz. It utilizes an HC-49/US package with three pins, where the third lead is grounded to minimize electromagnetic interference. The component features a shunt capacitance of 7 pF maximum and an equivalent series resistance of 80 ohms. It supports a drive level range of 1 to 500 μW, with a typical value of 100 μW. Frequency stability is specified at ±20 ppm over the operating temperature range of -20°C to +70°C.

Crystals Feature Summary

• Third lead grounding design for enhanced EMI suppression in sensitive circuits
• Low profile surface mount construction suitable for automated assembly
• Hermetically sealed metal can packaging ensuring environmental durability

Crystals Applications

• EMI sensitive electronic applications
• Medical electronics equipment
• Wireless communication devices

Crystals Procurement Notes

Verify that the specific suffix matches the required tolerance and load capacitance specifications for your circuit design. Confirm the grounded third lead configuration is compatible with your PCB layout requirements. Ensure the operating temperature range aligns with the intended application environment. Check compliance documentation for RoHS and halogen-free status if required by your manufacturing standards.

Crystals Selection Notes

Select this component when low-profile surface mounting is required alongside effective electromagnetic interference reduction. The grounded third lead distinguishes it from standard two-lead SMD crystals, making it suitable for high-noise environments. Consider the 80 ohm ESR and 7 pF shunt capacitance values when designing the oscillator circuit to ensure proper startup and stable operation within the specified frequency tolerance.

Crystals Part Context

This part belongs to the QT49S series of surface-mount crystals manufactured by FTS (formerly QST). The series offers various frequencies from 3.2 MHz to 90 MHz in the HC-49/US form factor. The specific model indicates a 7.5 MHz fundamental frequency with defined electrical characteristics for industrial and commercial use.

Crystals Replacement Considerations

Direct substitutes include other HC-49/US SMD crystals with grounded third leads such as those from Abracon or Epson, provided they match the 7.5 MHz frequency, 80 ohm ESR, and 7 pF C0 parameters.