QT325S-44.000MEEB-T

Overview

The QT325S-44.000MEEB-T is a quartz crystal resonator manufactured by QST, designed for surface-mount applications. It operates at a nominal frequency of 44.000 MHz and utilizes a 3.2mm x 2.5mm SMD package with no lead construction. The component features a load capacitance of 12pF and an equivalent series resistance (ESR) of 80 Ohms. Frequency stability is specified at ±20ppm over the operating temperature range of -20°C to +70°C. This device is part of the QT325S series, offering reliable performance for timing circuits requiring precise frequency control in compact electronic designs.

Feature Summary

• Surface-mount design with a compact 3.2mm x 2.5mm footprint
• Seam-sealed glass construction for environmental protection
• Stable frequency output within specified temperature ranges
• Compatible with standard automated assembly processes

Applications

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

Procurement Notes

Verify the specific suffix 'B' indicates the correct ±20ppm stability class for your application requirements. Confirm that the 12pF load capacitance matches your circuit design specifications. Ensure the operating temperature range of -20°C to +70°C aligns with your environmental conditions. Check for RoHS compliance status if required by your manufacturing standards. Validate package dimensions against your PCB footprint guidelines before ordering.

Selection Notes

Choose this component when a 44MHz frequency is specifically required for system synchronization. Consider the ±20ppm stability tolerance against your phase noise and jitter requirements. Evaluate the 80 Ohm ESR against your oscillator circuit's drive level constraints. Compare the 3.2x2.5mm size against available board space limitations. Assess the -20°C to +70°C range against your operational environment extremes.

Part Context

This part belongs to the QT325S series of seam-sealed quartz crystals from QST. The series offers various frequencies and stability options in a standardized small outline package. Similar parts include variants with different frequencies like 32MHz or 48MHz, and stability codes such as 'E' for ±10ppm or 'A' for ±30ppm. The 'QT325S' designation identifies the physical case style and mounting type common across the product line.

Replacement Considerations

Direct substitutes may include other manufacturers' 44MHz crystals in 3.2x2.5mm packages with matching 12pF load capacitance. Verify equivalent ESR values to ensure oscillator startup reliability. Cross-reference stability ratings to confirm ±20ppm performance meets system needs. Check pinout compatibility if using alternative brands with similar form factors.