QT49S-7.3728MAHJ-T

Overview

The QT49S-7.3728MAHJ-T is a surface-mount quartz crystal resonator manufactured by TXC Corporation and distributed under the QST brand. It operates at a nominal frequency of 7.3728 MHz with a fundamental mode of oscillation. The component features an HC-49/US SMD package, measuring 12.7 x 4.8 x 3.8 mm. Key electrical specifications include a load capacitance of 18 pF, a series resistance of 80 Ohms, and a frequency tolerance of ±30 ppm at 25°C. Frequency stability is maintained within ±30 ppm across an operating temperature range of -40°C to +85°C.

Feature Summary

• Surface-mount design compatible with automated assembly processes
• Fundamental mode operation for stable frequency generation
• Metal housing construction providing electromagnetic shielding

Applications

• Microcontroller clock sources
• Communication interface timing circuits
• Digital signal processing systems

Procurement Notes

Verify that the ordering suffix matches the required tolerance and stability specifications. Confirm the package type is HC-49/US SMD rather than through-hole. Ensure the manufacturer designation aligns with TXC Corporation standards despite the QST distribution label. Cross-reference the part number against official datasheets to validate the 7.3728 MHz frequency and 18 pF load capacitance requirements before finalizing procurement orders.

Selection Notes

Select this component when a precise 7.3728 MHz reference is required for digital logic or communication protocols. The HC-49/US SMD form factor suits space-constrained printed circuit board layouts. Consider the ±30 ppm stability requirement for applications sensitive to temperature-induced frequency drift. Verify compatibility with the target oscillator circuit's load capacitance and drive level limitations to ensure reliable operation.

Part Context

This crystal belongs to the QT49S series, which encompasses various surface-mount quartz resonators. The series offers multiple frequency options within the same physical footprint. The specific model provides a standard frequency used in telecommunications and computing applications. Distribution through QST indicates availability via electronic component distributors alongside the primary manufacturer, TXC Corporation.

Replacement Considerations

Substitute parts must match the 7.3728 MHz frequency, 18 pF load capacitance, and HC-49/US SMD package dimensions. Verify equivalent electrical parameters including series resistance and stability ranges. Ensure the replacement component meets the same -40°C to +85°C operating temperature specification.