QT325G-28.224MAAV-T

Overview

The QST QT325G-28.224MAAV-T is a surface-mount crystal resonator operating at a fundamental frequency of 28.224 MHz. It features a compact 4-pin CSMD package with body dimensions of 3.2 x 2.5 x 0.8 mm. The component exhibits a load capacitance of 8 pF and an equivalent series resistance (ESR) of 60 Ohms. Frequency stability and resonator tolerance are both specified at ±30 ppm. The device is designed for operation within a temperature range extending from -20°C to +70°C.

Feature Summary

• Fundamental mode oscillation capability
• Compact surface-mount form factor
• Low equivalent series resistance design

Applications

• Clock signal generation in digital circuits
• Microcontroller oscillator inputs
• Communication interface timing references

Procurement Notes

Verify the specific suffix 'AAV' against the manufacturer's current datasheet to confirm the exact temperature range and tolerance specifications, as suffixes often denote critical environmental or performance variations. Ensure the ordering documentation explicitly matches the part number QT325G-28.224MAAV-T to avoid confusion with similar variants like MAHV-T which may have different thermal characteristics. Cross-reference the supplier's certificate of conformity with the official QST specification sheet to validate authenticity and parameter accuracy prior to integration into production designs.

Selection Notes

Select this component when a precise 28.224 MHz reference is required for UART or SPI communication interfaces that utilize standard baud rate dividers. The 8 pF load capacitance must match the external capacitors in the oscillator circuit to achieve the specified ±30 ppm stability. Consider the 60 Ohm ESR value when designing the drive level to prevent overdriving the crystal. The -20°C to +70°C operating range suits general commercial applications but may require alternative parts for industrial environments requiring wider thermal margins.

Part Context

This part belongs to the QST QT325G series of thin-film or bulk acoustic wave crystals housed in small outline packages. The series provides standardized frequencies for common data communication protocols. The 3.2x2.5mm footprint allows for high-density PCB layouts compared to larger HC-49 packages. Similar models in the family include variants with different frequencies such as 24.576 MHz or 30.000 MHz, sharing identical physical dimensions and electrical characteristics except for the resonant frequency.

Replacement Considerations

Direct substitutes include other manufacturers' 28.224 MHz crystals in 3.2x2.5mm SMD packages with 8pF load capacitance and ±30ppm stability. Verify pin compatibility and mounting orientation. Check if alternative brands offer improved temperature stability if the application exceeds the -20°C to +70°C range.