402WF40012IMR

Crystals Overview

The CTS-Frequency Controls 402WF40012IMR is a surface-mount crystal resonator operating at a fundamental frequency of 40 MHz. It features a load capacitance of 4 pF and a frequency tolerance of ±10 ppm, with stability rated at ±20 ppm. The component exhibits an equivalent series resistance (ESR) of 50 Ohms and supports a maximum drive level of 10 uW. Designed for industrial environments, it functions within a temperature range of -40°C to +85°C. The unit utilizes a compact 4-SMD, no-lead package measuring 2.00 mm in length, 1.60 mm in width, and 0.55 mm in height.

Crystals Feature Summary

• Compact 4-SMD no-lead footprint suitable for high-density PCB layouts
• Industrial-grade temperature rating spanning -40°C to +85°C
• Fundamental mode operation with low equivalent series resistance

Crystals Applications

• Clock signal generation for microcontrollers and digital logic circuits
• Timing references for communication interfaces such as UART and SPI
• Frequency control in industrial instrumentation and embedded systems

Crystals Procurement Notes

Verify the specific suffix configuration against the manufacturer datasheet to ensure compatibility with target circuit load capacitance requirements. Confirm that the selected variant matches the required ESR and drive level specifications for the oscillator design. Cross-reference the package dimensions with the PCB footprint library to prevent assembly errors during surface mount placement.

Crystals Selection Notes

Select this component when a 40 MHz fundamental frequency with tight ±10 ppm tolerance is required for precise timing applications. Ensure the host circuit provides a 4 pF load capacitance to maintain frequency accuracy. Consider the 50 Ohm ESR value for oscillator loop gain calculations. Verify that the operating environment remains within the specified -40°C to +85°C range for stable performance.

Crystals Part Context

This part belongs to the 402W series of surface-mount crystals from CTS-Frequency Controls. The series offers various frequency options and package sizes optimized for modern electronics manufacturing. The 402W designation indicates specific dimensional and electrical characteristics tailored for SMD reflow processes, distinguishing it from through-hole or larger package alternatives.

Crystals Replacement Considerations

Public documentation lists the 402F40012IDT as a parameter-equivalent alternative. Note that the 402F variant specifies an 18 pF load capacitance, which differs significantly from the 4 pF requirement of the 402WF model. Circuit redesign may be necessary if substituting with the 402F series due to this capacitance mismatch.