FK122EIWM0.032768-T3

Crystals Overview

The FK122EIWM0.032768-T3 is a surface-mount tuning fork crystal manufactured by Fox Electronics, designed for precision timing applications. It operates at a nominal frequency of 32.768 kHz with a frequency tolerance of ±20 ppm at 25°C. The component features a load capacitance of 9 pF and a maximum equivalent series resistance (ESR) of 90 kΩ. Frequency stability is rated at -0.04 ppm/(Δ°C)² over an operating temperature range of -40°C to +85°C, with a turnover temperature between +20°C and +30°C. Aging is specified at ±3 ppm per year. The physical dimensions are approximately 2.1 mm x 1.3 mm with a height of 0.6 mm, utilizing gold-over-nickel termination finish.

Crystals Feature Summary

• Miniature SMD footprint optimized for space-constrained portable and handheld devices
• Standard tuning fork structure tailored for real-time clock (RTC)基准 frequencies
• Gold-over-nickel termination finish ensuring reliable solderability and corrosion resistance

Crystals Applications

• Real-time clock circuits in wearable electronics
• Portable medical monitoring devices
• Handheld consumer gadgets requiring low power consumption

Crystals Procurement Notes

Verify the specific suffix 'W' corresponds to the 9 pF load capacitance requirement against your microcontroller's internal RTC load settings. Confirm that the standard industrial temperature range (-40°C to +85°C) meets your environmental specifications, as automotive variants like the FK12A offer extended ranges. Ensure PCB layout accounts for the small 2.1x1.3mm package dimensions to prevent mechanical stress during board separation or assembly processes.

Crystals Selection Notes

Select this model when a compact form factor is critical but standard 32.768 kHz crystals are too large. The 9 pF load capacitance requires matching with MCU designs supporting this value; otherwise, alternative suffixes such as 'H' for 12.5 pF may be necessary. Consider the 90 kΩ ESR limit to ensure sufficient drive level compatibility with the target oscillator circuit, particularly in low-power sleep modes where minimal current draw is essential.

Crystals Part Context

The FK122 series represents a significant size reduction compared to traditional watch crystals, being approximately 33% smaller than previous models. Originally designated as FX122, the series was updated to FK122 to reflect manufacturing improvements while maintaining the same electrical characteristics. This family is part of Fox Electronics' portfolio focused on providing high-reliability frequency control solutions for miniaturized electronic systems.

Crystals Replacement Considerations

Direct substitutes include other 2012-sized 32.768 kHz crystals with 9 pF load capacitance and similar ESR limits. Cross-reference with Fox's own FK12A series if automotive qualification (AEC-Q200) is required instead of industrial grade. Verify pinout compatibility and thermal handling capabilities before swapping manufacturers.