QT325S-50.000MDIQ-T

Overview

The QST QT325S-50.000MDIQ-T is a surface-mount quartz crystal resonator designed for precise frequency control in electronic circuits. It operates at a fundamental frequency of 50 MHz with a load capacitance of 18 pF and an equivalent series resistance of 50 Ohms. The component features a compact 4-SMD, No Lead package with dimensions of 3.20mm x 2.50mm x 0.70mm. Frequency stability is specified at ±20 ppm over the operating temperature range of -20°C to +70°C, ensuring reliable performance in standard commercial applications.

Feature Summary

• Compact 3.2x2.5mm surface-mount footprint suitable for space-constrained designs
• High frequency stability of ±20 ppm within the commercial temperature range
• Glass-sealed construction for environmental protection and long-term reliability

Applications

• Microcontroller clock sources
• Communication module timing references
• Consumer electronics signal processing

Procurement Notes

Verify the suffix 'MDIQ' against official QST documentation to confirm the specific stability and temperature rating. Ensure the required load capacitance matches the target circuit design. Confirm package compatibility with automated pick-and-place equipment before finalizing procurement orders.

Selection Notes

Select this component when a 50 MHz reference is required in a small SMD form factor. The ±20 ppm stability suits general-purpose digital logic and communication interfaces. Compare against higher stability variants if automotive or industrial temperature ranges are necessary for the specific application environment.

Part Context

This part belongs to the QT325S family of glass-sealed crystals from QST. These components utilize a hermetic seal to protect the quartz element. The model number indicates specific electrical parameters including frequency, load capacitance, and stability class defined by the manufacturer's coding system.

Replacement Considerations

Direct substitutes include other 50 MHz crystals with identical 18 pF load capacitance and similar ±20 ppm stability. Verify that replacement parts maintain the same 3.2x2.5mm package dimensions and mounting pad layout to ensure mechanical compatibility without PCB redesign.