QT325S-50.000MEHJ-T

Overview

The QT325S-50.000MEHJ-T is a surface-mount quartz crystal manufactured by QST, designed for precise frequency generation in electronic circuits. It operates at a nominal frequency of 50 MHz and utilizes a 4-SMD, no-lead package with dimensions of 3.2mm x 2.5mm. The component features a load capacitance of 18 pF and an equivalent series resistance of 50 Ohms. Frequency stability is specified at ±10 ppm over the temperature range of -30°C to +85°C, as indicated by the 'T' suffix in the part number. This configuration ensures reliable performance in compact digital applications requiring accurate timing signals.

Feature Summary

• Compact surface-mount design suitable for space-constrained PCB layouts
• High frequency stability within extended industrial temperature ranges
• Standardized 4-terminal SMD footprint for automated assembly

Applications

• Digital clock signal generation in microcontroller systems
• Communication interface timing synchronization
• Precision timer circuits in embedded devices

Procurement Notes

Verify the complete part number against official QST documentation to confirm the specific stability rating associated with the 'MEHJ' suffix. Ensure that the required load capacitance matches the target circuit design specifications. Confirm package compatibility with existing pick-and-place equipment. Cross-reference the temperature range requirements with the application environment to validate the selected stability grade.

Selection Notes

Select this component when a 50 MHz reference is required in a small form factor. The ±10 ppm stability over -30°C to +85°C makes it suitable for demanding environments. Compare with other suffixes if different temperature ranges or stability levels are needed. Ensure the 18 pF load capacitance aligns with the oscillator circuit's parasitic capacitance calculations to maintain accuracy.

Part Context

This part belongs to the QT325S series of thin-film quartz crystals from QST. The series offers various frequency options and stability grades defined by alphanumeric suffixes. The 3.2x2.5mm package size provides a balance between electrical performance and board space efficiency. Other variants in the series may differ in stability, temperature range, or load capacitance while maintaining similar physical dimensions.

Replacement Considerations

Direct substitutes must match the 50 MHz frequency, 18 pF load capacitance, and ±10 ppm stability over -30°C to +85°C. Verify pinout compatibility for the 4-SMD no-lead package. Check mechanical height constraints if vertical clearance is limited.