QT325S-40.000MDIE-T

Overview

The QT325S-40.000MDIE-T is a 40 MHz fundamental mode quartz crystal resonator manufactured by QST. It utilizes a surface-mount package with dimensions of 3.2mm x 2.5mm x 0.7mm. The component features a load capacitance of 18pF and an equivalent series resistance (ESR) of 50 Ohms. Frequency stability is rated at ±20ppm over the operating temperature range of -20°C to +70°C. This device is designed for precision timing applications requiring compact form factors.

Feature Summary

• Compact 3.2mm x 2.5mm surface-mount footprint
• Fundamental mode quartz resonance technology
• High frequency stability within specified thermal range

Applications

• Microcontroller clock sources
• Communication module timing references
• Portable electronic device oscillators

Procurement Notes

Verify the specific suffix 'MDIE' against official QST documentation to confirm the exact frequency tolerance and temperature range specifications. Ensure the ordering part number matches the required load capacitance and ESR values for your circuit design. Confirm RoHS compliance status through current manufacturer declarations prior to procurement.

Selection Notes

Select this component when a small SMD crystal with ±20ppm stability between -20°C and +70°C is required. Compare against other QT325S variants if wider temperature ranges or different load capacitances are needed. Ensure the PCB layout supports the 3.2x2.5mm package dimensions and appropriate grounding for optimal performance.

Part Context

This part belongs to the QT325S series of thin film bulk acoustic resonator (FBAR) or standard quartz crystals from QST, designed for high-volume consumer electronics. The series offers various stability grades and temperature ranges distinguished by alphanumeric suffixes. It serves as a critical timing element in modern miniaturized hardware designs.

Replacement Considerations

Direct substitutes include other QT325S variants with matching 40MHz frequency and 18pF load capacitance. Verify compatibility with alternative manufacturers offering identical 3.2x2.5mm packages and ±20ppm stability ratings before substitution.