QT161S-40.000MDDV-T

Overview

The QST QT161S-40.000MDDV-T is a quartz crystal resonator manufactured by QST Corporation, designed for surface-mount applications. It operates at a fundamental frequency of 40.000 MHz with a load capacitance of 18 pF. The component features a frequency tolerance of ±30 ppm and stability of ±50 ppm over the operating temperature range of -40°C to +85°C. It utilizes an AT-cut resonator element housed in a compact 4-SMD, no lead package measuring 3.2 mm x 2.5 mm x 0.8 mm. The device exhibits an equivalent series resistance (ESR) of 60 Ohms maximum and supports a drive level of 1 mW. It is compliant with RoHS standards and meets AEC-Q200 automotive qualification requirements.

Feature Summary

• Automotive-grade reliability certified under AEC-Q200 standards
• Compact surface-mount footprint suitable for high-density PCB layouts
• Stable frequency performance across wide industrial temperature ranges

Applications

• Automotive electronic control units requiring precise timing
• Industrial communication modules needing stable clock signals
• Consumer electronics utilizing surface-mount crystal oscillators

Procurement Notes

Verify the specific suffix codes against official QST documentation to ensure correct load capacitance and tolerance specifications. Confirm that the ordering quantity aligns with standard reel packaging requirements. Check for updated environmental compliance declarations prior to procurement. Ensure storage conditions maintain moisture sensitivity levels as defined in the datasheet. Validate compatibility with reflow soldering profiles specified for this component type.

Selection Notes

Select this component when a 40 MHz reference signal is required for automotive or industrial systems. Consider the 18 pF load capacitance requirement for circuit design matching. Evaluate the 60 Ohm ESR limit against oscillator circuit capabilities. Assess the 4-SMD package dimensions for spatial constraints on the target board. Verify that the ±30 ppm initial tolerance meets system accuracy requirements.

Part Context

This part belongs to QST's line of miniature surface-mount quartz crystals. It serves as a frequency-determining element in oscillator circuits. The product replaces older through-hole variants with a modern SMD form factor. It supports mass production assembly processes due to its standardized package. The component is widely used in timing applications requiring moderate precision.

Replacement Considerations

Direct substitutes include other 40 MHz SMD crystals with identical 3.2x2.5mm footprints and 18pF load capacitance. Verify equivalent ESR and drive level specifications before substitution. Ensure replacement parts meet the same AEC-Q200 automotive qualification if applicable.