QT325S-40.000MEDC-T

Overview

The QT325S-40.000MEDC-T is a quartz crystal resonator manufactured by QST, designed for surface-mount applications. It operates at a fundamental frequency of 40 MHz and utilizes a 4-SMD, No Lead package with dimensions of 3.2mm x 2.5mm x 0.7mm. The component features a load capacitance of 10pF and an equivalent series resistance (ESR) of 50 Ohms. Frequency stability is specified at ±10ppm within the -20°C to +70°C temperature range. This device provides precise timing signals for digital circuits requiring compact form factors.

Feature Summary

• Compact surface-mount design suitable for space-constrained PCB layouts
• High frequency stability ensuring reliable clock signal generation
• Seam seal construction for environmental protection

Applications

• Microcontroller clock sources
• Communication module timing references
• Consumer electronics control circuits

Procurement Notes

Verify the specific suffix MEDC against official QST documentation to confirm the exact stability and temperature range specifications. Ensure compatibility with standard reflow soldering profiles for 4-SMD packages. Cross-reference the manufacturer part number with authorized distributors to confirm current availability and authenticity before procurement.

Selection Notes

Select this component when a 40 MHz reference is required in a small footprint. The 10pF load capacitance must match the oscillator circuit design. Consider the ±10ppm stability requirement relative to system timing accuracy needs. Evaluate thermal performance within the -20°C to +70°C operational window for the intended application environment.

Part Context

This crystal belongs to the QT325S series from QST, which offers various frequency and stability options in a standardized 3.2x2.5mm SMD package. The series supports diverse timing requirements across consumer and industrial electronics. Variations in suffixes denote differences in stability, temperature range, and load capacitance.

Replacement Considerations

Compatible substitutes include other 40MHz crystals in 3225 packages with 10pF load capacitance and similar stability ratings. Verify pinout compatibility and electrical parameters such as ESR and frequency tolerance before substitution.