QT325S-12.000MAHJ-T

Overview

The QT325S-12.000MAHJ-T is a 12 MHz quartz crystal resonator manufactured by QST, designed for surface-mount applications. It features a frequency stability of ±30ppm at 25°C and across the -40°C to +85°C operating temperature range. The component operates in fundamental mode with a load capacitance of 18pF and an equivalent series resistance (ESR) of 80 Ohms. Housed in a compact 4-SMD, No Lead package measuring 3.2mm x 2.5mm x 0.7mm, it supports RoHS3 compliance and offers moisture sensitivity level 1.

Feature Summary

• Compact 4-SMD no-lead surface mount package
• High frequency stability across industrial temperature range
• Fundamental mode operation with low ESR

Applications

• General purpose clock generation circuits
• Microcontroller system oscillators
• Communication module timing references

Procurement Notes

Verify exact package dimensions and soldering profile requirements against the official QST datasheet before integration. Confirm that the 80 Ohm ESR value aligns with the oscillator circuit design specifications. Ensure compatibility with RoHS3 regulations if required by the end product. Check availability status as supply levels may fluctuate.

Selection Notes

Select this component when a 12 MHz fundamental frequency is required with ±30ppm stability over -40°C to +85°C. The 18pF load capacitance must match the external capacitors in the oscillator circuit. Consider the 4-SMD footprint for space-constrained PCB layouts. Verify that the 80 Ohm ESR is within the driving capability limits of the host oscillator IC.

Part Context

This part belongs to the QT325S series from QST, which specializes in miniature quartz crystals. The series offers various frequencies with consistent 30ppm stability and 18pF load capacitance. The QT325S form factor provides a balance between size and performance for consumer electronics and portable devices requiring precise timing.

Replacement Considerations

Direct substitutes include parts with identical 12MHz frequency, 18pF load capacitance, and 4-SMD 3.2x2.5mm footprint. Verify ESR values and temperature stability ranges match or exceed the original specifications. Cross-reference pinout and mechanical tolerances to ensure board compatibility.