CS31-32.768K-7

Crystals Overview

The CS31-32.768K-7 is a ceramic surface-mount tuning fork crystal manufactured by Transko Electronics, Inc., designed for precise timing applications. It operates at a fundamental frequency of 32.768 kHz with a frequency tolerance of ±20 ppm. The component features a load capacitance of 7 pF and an equivalent series resistance (ESR) of 80 kOhms. It utilizes a 2-SMD, no-lead package construction. The device supports an operating temperature range from -40°C to +85°C, ensuring stability across standard industrial environments.

Crystals Feature Summary

• Miniature ceramic SMD tuning fork design optimized for space-constrained PCB layouts
• Fundamental mode operation providing stable 32.768 kHz output for clock generation
• RoHS compliant and lead-free construction meeting environmental standards

Crystals Applications

• Real-time clock circuits in consumer electronics
• Microcontroller system oscillators requiring low power consumption
• Wearable devices and portable instruments with limited board space

Crystals Procurement Notes

Verify the specific suffix '7' corresponds to the 7pF load capacitance requirement in your circuit design. Confirm that the 80 kOhm ESR value aligns with the oscillator circuit's drive level limitations. Ensure the -40°C to +85°C temperature range meets the operational environment specifications. Check RoHS compliance status if required by project regulations. Validate package dimensions against the mechanical footprint constraints on the target PCB layout.

Crystals Selection Notes

Select this component when a compact, low-cost ceramic solution is preferred over metal can crystals. The 7pF load capacitance requires matching external capacitors or internal oscillator settings accordingly. Consider the higher ESR compared to metal resonators, which may impact start-up time in high-impedance circuits. This part is suitable for general-purpose timing where extreme long-term stability is not critical.

Crystals Part Context

This part belongs to the CS31 series of miniature ceramic SMD tuning fork crystals from Transko Electronics. Similar variants in the series include CS31-32.768K-12.5, which differs primarily in load capacitance specifications. The CS31 series is characterized by its small form factor and suitability for mass-produced electronic assemblies requiring reliable 32.768 kHz references.

Crystals Replacement Considerations

Direct substitutes must match the 32.768 kHz frequency, 7pF load capacitance, and 2-SMD no-lead package. Verify that alternative manufacturers offer comparable ESR values around 80 kOhms to ensure circuit compatibility. Cross-reference pinout and dimensional tolerances to confirm mechanical fit without rework.