QT325G-25.000MEIV-T

Overview

The QT325G-25.000MEIV-T is a surface-mount quartz crystal oscillator manufactured by QST, designed for precision timing applications. It operates at a fundamental frequency of 25 MHz with a package size of 3.2 x 2.5 mm. The component features a load capacitance of 8 pF and an equivalent series resistance (ESR) of 60 Ω. Initial frequency tolerance is specified at ±10 ppm, while total frequency stability over the operating temperature range of -40°C to +85°C is rated at ±20 ppm. This SMD3225-4P device utilizes glass seal technology and complies with RoHS standards.

Feature Summary

• Provides precise 25 MHz timing signals using fundamental resonance mode
• Features robust glass seal construction for environmental durability
• Supports wide industrial temperature operation from -40°C to +85°C
• Designed for compact surface-mount integration in space-constrained circuits

Applications

• Microcontroller clock sources requiring stable frequency references
• Communication modules needing precise carrier synchronization
• Industrial control systems operating in variable thermal environments
• Consumer electronics utilizing high-frequency digital signal processing

Procurement Notes

Verify that the ordering suffix MEIV-T corresponds to the specific ±10 ppm initial tolerance and ±20 ppm total stability requirements. Confirm the 8 pF load capacitance matches the host circuit design to ensure accurate frequency output. Ensure the -40°C to +85°C temperature range aligns with the operational environment specifications before finalizing procurement decisions.

Selection Notes

Select this component when a 25 MHz fundamental frequency is required within a 3.2 x 2.5 mm footprint. The 8 pF load capacitance dictates compatibility with specific oscillator circuit designs. Consider the ±10 ppm initial tolerance for calibration needs and the ±20 ppm total stability for long-term performance across the -40°C to +85°C range. Verify ESR limits against driver circuit capabilities.

Part Context

This part belongs to the QT325G series of surface-mount quartz crystals from QST. The series offers various frequency options and stability grades within the standard SMD3225-4P package. The QT325G line is engineered for general-purpose timing applications, providing reliable performance through glass-sealed resonator technology suitable for mass production assembly processes.

Replacement Considerations

Direct substitutes include other 25 MHz crystals in the 3225 package with matching 8 pF load capacitance and similar stability ratings. Cross-reference parameters such as ESR and temperature coefficients to ensure functional equivalence. Verify pinout compatibility and mounting dimensions before implementing alternative components.