QT325S-12.000MAAJ-T

Overview

The QT325S-12.000MAAJ-T is a surface-mount quartz crystal resonator manufactured by QST, designed for precision timing applications. It operates at a nominal frequency of 12 MHz with a load capacitance of 18 pF. The component features a compact SMD package measuring 3.2 x 2.5 mm and utilizes glass seal technology for environmental stability. Frequency tolerance is specified at ±30 ppm within the -20°C to +70°C operating temperature range. This device serves as a fundamental frequency reference in electronic circuits requiring stable oscillation.

Feature Summary

• Utilizes glass seal construction for enhanced environmental protection and long-term reliability
• Provides precise 12 MHz frequency output suitable for digital clock generation
• Designed for surface-mount assembly to support automated PCB manufacturing processes

Applications

• Embedded communication systems requiring stable clock signals
• Microcontroller unit (MCU) external clock sources
• Digital signal processing circuitry timing references

Procurement Notes

Verify the manufacturer designation carefully, as some distributor listings may incorrectly associate this part number with TXC. Confirm the specific suffix 'T' indicates tape-and-reel packaging if required for production. Ensure the glass seal specification matches the environmental requirements of the target application before finalizing procurement orders.

Selection Notes

Select this component when a 12 MHz reference is needed in a small form factor. The ±30 ppm tolerance defines the acceptable frequency deviation over the industrial temperature range. Consider the 18 pF load capacitance requirement to ensure proper oscillator circuit design compatibility with the host system's input capacitance.

Part Context

This model belongs to the QT325S series of surface-mount crystals from QST. The series offers various frequency options within a standardized 3.2 x 2.5 mm footprint. The glass seal variant provides superior stability compared to standard epoxy-sealed counterparts, making it suitable for demanding industrial and commercial electronics applications.

Replacement Considerations

Direct substitutes include other 12 MHz SMD crystals with identical 3.2x2.5mm dimensions and 18pF load capacitance. Verify that alternative parts maintain the same ±30 ppm tolerance and glass seal construction to ensure equivalent performance in existing designs.