QT325S-25.000MAHJ-T

Overview

The QT325S-25.000MAHJ-T is a surface-mount quartz crystal oscillator manufactured by QST, operating at a fundamental frequency of 25 MHz. It features a load capacitance of 18 pF and maintains a frequency stability tolerance of ±30 ppm across the specified temperature range. The component utilizes a seam seal ceramic package with four SMD terminals, measuring 3.2 mm in length, 2.5 mm in width, and 0.7 mm in height. Its equivalent series resistance (ESR) is rated at 50 Ohms, ensuring stable oscillation characteristics for precision timing applications.

Feature Summary

• Seam seal ceramic construction provides robust environmental protection and mechanical stability.
• Compact 4-SMD no-lead footprint enables efficient space utilization on high-density PCBs.
• Stable frequency performance maintained within ±30 ppm tolerance over standard industrial temperatures.

Applications

• Microcontroller clock source generation
• Communication interface timing circuits
• Digital signal processing synchronization

Procurement Notes

Verify the manufacturer designation carefully, as the model number appears in listings associated with both QST and TXC Corporation. Confirm the specific package variant and terminal configuration against the official datasheet to ensure compatibility with your design requirements. Cross-reference the ESR and load capacitance values with your circuit schematic to guarantee proper oscillator startup and stability.

Selection Notes

Select this component when a 25 MHz reference is required in a compact 3.2x2.5 mm surface-mount package. Ensure the application circuit supports an 18 pF load capacitance and can accommodate a 50 Ohm ESR. Verify that the ±30 ppm stability meets the system's timing accuracy constraints. Consider thermal management if operating near the upper temperature limits.

Part Context

This part belongs to the QT325S series of seam seal crystals, designed for general-purpose timing applications. The series offers various frequency options within the same physical footprint, allowing for design flexibility. The 25 MHz variant is commonly used in digital systems requiring precise clock signals for data transmission and processing operations.

Replacement Considerations

Direct substitutes include other 25 MHz crystals in the 3.2x2.5mm SMD package with matching 18pF load capacitance and similar ESR specifications. Verify pinout compatibility and thermal characteristics before substitution. Consult manufacturer cross-reference lists for approved alternatives.