12.87158

Crystals Overview

The Geyer Electronic America, Inc. model 12.87158 is a super ultra-miniature quartz crystal designed for compact electronic applications. It operates at a fundamental frequency of 32.768 kHz with a load capacitance of 12.5 pF and an equivalent series resistance of 70 kOhms. The component features a 2-pin surface-mount device (SMD) package without leads, utilizing ceramic construction. Frequency tolerance is specified as -10 ppm to +22 ppm, ensuring precise timing for low-power devices.

Crystals Feature Summary

• Super ultra-miniature footprint suitable for space-constrained designs
• Fundamental mode operation for stable timing reference
• Ceramic construction for durability in SMD format

Crystals Applications

• Hearing aids
• Earbuds
• Wireless applications

Crystals Procurement Notes

Verify the specific frequency tolerance range of -10 ppm to +22 ppm against design requirements, as some sources may cite different tolerances like ±20 ppm. Confirm the 2-pin SMD no-lead package dimensions match the PCB layout. Ensure the 12.5 pF load capacitance aligns with the oscillator circuit specifications. Check manufacturer documentation for storage conditions and soldering profiles to maintain component integrity during assembly.

Crystals Selection Notes

Select this component when a small form factor is critical for wearable or portable electronics. The 32.768 kHz frequency is standard for real-time clock applications. Consider the high ESR of 70 kOhms, which may require compatible oscillator circuits. The ceramic build offers robustness for miniaturized hearing aid or earbud environments where size constraints are severe compared to traditional watch crystals.

Crystals Part Context

This part belongs to the KX-2 series from Geyer Electronic America, Inc., characterized by super ultra-miniature footprints. It serves as a timing element similar to other 32.768 kHz crystals but distinguishes itself through its specific SMD no-lead packaging. The series targets markets requiring minimal board space, such as personal audio devices and compact wireless peripherals.

Crystals Replacement Considerations

Cross-reference with other 32.768 kHz SMD crystals from Geyer, such as the 12.87150, noting potential differences in tolerance specifications. Verify that substitute parts maintain the 12.5 pF load capacitance and compatible physical dimensions. Ensure any replacement supports the same fundamental frequency and package type to fit existing footprints.