QT325S-20.000MEIV-T

Overview

The QT325S-20.000MEIV-T is a surface-mount quartz crystal manufactured by QST, designed for precision timing applications. It operates at a fundamental frequency of 20 MHz with a load capacitance of 8 pF and an equivalent series resistance of 50 Ohms. The component exhibits high frequency stability, maintaining accuracy within ±10 ppm at 25°C and ±20 ppm across the industrial temperature range of -40°C to +85°C. Housed in a compact 3.2 x 2.5 mm SMD package with four terminals, it supports standard reflow soldering processes and meets MSL Level 1 moisture sensitivity requirements.

Feature Summary

• Provides stable oscillation with tight frequency tolerance across wide temperature variations
• Compact surface-mount design suitable for space-constrained circuit boards
• Robust construction ensuring reliable performance in industrial environments

Applications

• Microcontroller clock sources
• Communication module timing references
• Digital signal processing circuits

Procurement Notes

Verify that the ordering suffix matches the required frequency tolerance and temperature range specifications. Confirm the package dimensions align with the PCB footprint design. Ensure storage conditions comply with the specified moisture sensitivity level to prevent damage during assembly. Cross-reference the manufacturer part number with official distributor catalogs to avoid counterfeit components.

Selection Notes

Select this component when a 20 MHz reference signal is required with specific load capacitance constraints. Consider the ±10 ppm initial accuracy if precise synchronization is critical. Evaluate the 50 Ohm ESR against the oscillator circuit drive level requirements. Compare the 3.2x2.5 mm form factor against available board space and mounting orientation preferences.

Part Context

This part belongs to the QT325S series of surface-mount crystals from QST. The series offers various frequencies and tolerances within the same physical footprint. It serves as a direct replacement for other 3225-4P format crystals where 20 MHz operation and 8 pF load capacitance are mandated. The MEIV suffix denotes specific electrical characteristics including the 10/20 ppm tolerance profile.

Replacement Considerations

Direct substitutes must match the 3.2x2.5 mm package, 20 MHz frequency, 8 pF load capacitance, and 50 Ohm ESR. Verify that alternative parts support the -40°C to +85°C operating range and meet the same frequency stability requirements.