QT325S-50.000MDHJ-T

Overview

The QT325S-50.000MDHJ-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precision timing applications. It operates at a fundamental frequency of 50 MHz with a load capacitance of 18 pF and an equivalent series resistance of 50 Ohms maximum. The device features high frequency stability, specified as ±20 ppm at 25°C and ±30 ppm over the temperature range of -40°C to +85°C. Housed in a compact 4-SMD, No Lead package measuring 3.2 x 2.5 x 0.7 mm, it offers reliable performance for embedded systems requiring stable clock signals.

Feature Summary

• High frequency stability with tight tolerance across industrial temperature ranges
• Compact surface-mount design suitable for space-constrained PCB layouts
• Robust construction ensuring long-term reliability in electronic circuits

Applications

• Embedded communication systems
• Microcontroller clock sources
• Digital signal processing equipment

Procurement Notes

Verify the specific suffix MDHJ-T against official QST documentation to confirm the exact frequency stability ratings and temperature range specifications. Ensure compatibility with reflow soldering profiles recommended for this package type. Cross-reference the load capacitance requirement with the target circuit design to guarantee accurate oscillation frequency.

Selection Notes

Select this component when a 50 MHz reference signal is required with strict stability constraints. The ±20 ppm initial accuracy suits applications sensitive to timing drift. Consider the 18 pF load capacitance match with the oscillator circuit. The small form factor aids in miniaturization efforts where larger crystals cannot fit.

Part Context

This part belongs to the QT325S series of surface-mount crystals from QST. The series provides various frequency options within a standardized 3.2x2.5mm footprint. Different suffixes denote variations in stability, temperature range, and packaging. This specific model targets applications needing higher stability than standard commercial-grade crystals.

Replacement Considerations

Direct substitutes must match the 50 MHz frequency, 18 pF load capacitance, and 3.2x2.5mm package dimensions. Verify that alternative parts offer comparable ±20 ppm stability at 25°C. Check if the replacement supports the same operating temperature range of -40°C to +85°C.