QT325S-40.000MAHJ-T

Overview

The QT325S-40.000MAHJ-T is a surface-mount quartz crystal resonator manufactured by QST Products, LLC. It operates at a fundamental frequency of 40 MHz with a load capacitance of 18 pF and an equivalent series resistance (ESR) of 50 Ohms maximum. The component exhibits a frequency stability and tolerance of ±30 ppm at 25°C. It is housed in a compact 4-SMD, no-lead package with body dimensions of 3.2 x 2.5 x 0.7 mm. The device supports an operating temperature range from -40°C to +85°C, ensuring reliable performance across industrial and commercial environments.

Feature Summary

• Seam-sealed construction for environmental protection
• Compact surface-mount footprint suitable for high-density PCB layouts
• Stable frequency output with low ESR characteristics

Applications

• Microcontroller clock sources
• Communication module timing references
• Digital signal processing circuits

Procurement Notes

Verify the specific suffix MAHJ-T against the manufacturer's current datasheet to confirm pin configuration and sealing type. Ensure the ordering part number matches the required frequency tolerance and load capacitance specifications for the target circuit design before finalizing procurement.

Selection Notes

Select this component when a 40 MHz reference is required in a small SMD form factor. Confirm that the system load capacitance aligns with the 18 pF specification to maintain accuracy. Evaluate the -40°C to +85°C temperature range against the operational environment requirements to ensure long-term stability.

Part Context

This model belongs to the QT325S series of seam-sealed quartz crystals designed for general-purpose timing applications. The series offers various frequencies within a standardized 3.2x2.5mm package, providing a balance between size constraints and electrical performance for consumer and industrial electronics.

Replacement Considerations

Direct substitutes must match the 40 MHz frequency, 18 pF load capacitance, 50 Ohm ESR, and 3.2x2.5mm package dimensions. Verify compatibility with existing PCB footprints and soldering profiles when considering alternative manufacturers.