QT325S-12.288MEEQ-T

Overview

The QT325S-12.288MEEQ-T is a surface-mount quartz crystal manufactured by QST, operating at a fundamental frequency of 12.288 MHz. It features a frequency stability of ±10 ppm at 25°C and maintains ±10 ppm across the industrial temperature range of -20°C to +70°C. The component utilizes a 10 pF load capacitance and exhibits an equivalent series resistance (ESR) of 80 Ohms maximum. Housed in a compact 4-SMD, No Lead package with dimensions of 3.2mm x 2.5mm, it supports seam seal construction for enhanced environmental reliability.

Feature Summary

• Seam seal construction ensures robust environmental protection and long-term stability
• Compact 3.2mm x 2.5mm SMD footprint facilitates high-density PCB layouts
• High frequency stability of ±10 ppm across specified industrial temperature ranges

Applications

• Clock generation for microprocessors and microcontrollers
• Timing references for communication interfaces such as UART and SPI
• Frequency synthesis in wireless transceivers
• Real-time clock circuits requiring precise timekeeping

Procurement Notes

Verify that the specific suffix 'EEQ' corresponds to the required temperature range (-20°C to +70°C) and packaging configuration. Confirm compatibility with reflow soldering profiles defined in the official datasheet. Ensure the load capacitance matches the oscillator circuit design requirements to maintain specified frequency accuracy.

Selection Notes

Select this component when a 12.288 MHz reference is required for digital systems needing ±10 ppm stability within the -20°C to +70°C range. Compare ESR limits against oscillator driver strength specifications. Consider the 3.2x2.5mm package size relative to available board space and thermal management constraints during the design phase.

Part Context

This part belongs to the QT325S series of thin-film or seam-seal quartz crystals designed for surface-mount applications. The series offers various frequency options and stability grades, catering to consumer electronics and industrial control systems where space constraints and reliability are critical factors for timing precision.

Replacement Considerations

Direct substitutes include other manufacturers' 12.288 MHz crystals in 3225 packages with ±10 ppm stability and 10pF load capacitance. Verify pinout compatibility and mechanical height restrictions before substitution. Cross-reference ESR values to ensure oscillator circuit oscillation startup conditions are met.