STDCSU2-40M

Overview

The STDCSU2-40M is a surface-mount MHz crystal manufactured by NDK (NIHON DEMPA KOGYO CO., LTD). It operates at a frequency of 40 MHz with a frequency tolerance of ±50ppm. The component features an equivalent series resistance (ESR) of 50 Ohms and requires a load capacitance of 8pF. It utilizes a fundamental oscillation mode within a 2-SMD, No Lead package measuring 5mm x 3.2mm.

Feature Summary

• Fundamental mode quartz crystal operation for stable timing signals
• Compact 2-SMD surface mount footprint for automated assembly
• Designed for integration into standard reflow soldering processes

Applications

• General purpose clock generation in embedded systems
• Microcontroller oscillator circuits
• Digital signal processing timing references
• Consumer electronics control boards

Procurement Notes

Verify the specific package dimensions against the official datasheet to ensure compatibility with the target PCB land pattern. Confirm that the ±50ppm frequency tolerance meets the system requirements for the intended application environment. Check for RoHS compliance status if restricted substances are prohibited in the final product assembly.

Selection Notes

Select this component when a 40 MHz fundamental frequency is required with moderate stability. The 50 Ohm ESR value should be compatible with the driving circuit's impedance matching requirements. Ensure the 8pF load capacitance aligns with the host controller's internal or external capacitor configuration to achieve accurate frequency output.

Part Context

This part belongs to the SMD crystal category from NDK, designed for compact electronic assemblies. It serves as a passive frequency-determining element in oscillator circuits. The 2-SMD form factor allows for space-constrained designs compared to larger through-hole alternatives, supporting modern miniaturization trends in consumer and industrial hardware.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.