RV-3129-C3-32.768KHZ-OPTION-B-TA-QC

Real Time Clock Overview

The RV-3129-C3-32.768KHZ-OPTION-B-TA-QC is a hermetically sealed SMT Real-Time Clock Module by Micro Crystal AG, integrating a CMOS circuit with a 32.768 kHz tuning fork crystal in a 3.7 x 2.5 x 0.9 mm ceramic package. It operates on a supply voltage of 1.3 V to 5.5 V, consuming 800 nA at 3 V during timekeeping. This specific variant features Option B temperature compensation, ensuring a time accuracy of ±25 ppm across the standard -40°C to +85°C range. The module supports an I²C interface up to 400 kHz and includes automatic backup switchover and trickle charger functions.

Real Time Clock Feature Summary

• Hermetically sealed ceramic package with metal lid connected to VSS (pin #6).
• Option B time accuracy: ±25 ppm from -40°C to +85°C.
• Low power consumption: 800 nA typical at 3 V in timekeeping mode.
• Wide operating voltage range: 1.3 V to 5.5 V.
• Includes 2 bytes non-volatile user memory and 8 bytes user RAM.

Real Time Clock Applications

• IoT devices
• Metering systems
• Industrial equipment
• Portable electronics
• Automotive applications

Real Time Clock Procurement Notes

Verify that the ordering suffix 'QC' corresponds to Commercial Grade as defined in the datasheet, while 'QA' denotes Automotive Grade AEC-Q200 qualification. Confirm the 'TA' suffix indicates the standard -40 to +85°C operating temperature range rather than the extended TB range. Ensure the Option B specification aligns with the required ±25 ppm accuracy for the target application environment.

Real Time Clock Selection Notes

Select this model when ±25 ppm accuracy is sufficient for the design requirements within the -40°C to +85°C range. Choose Option A if tighter accuracy of ±6 ppm is needed under the same conditions. Consider the TB suffix if the application requires operation up to +125°C. Verify that the 1.3 V minimum supply voltage meets the system's low-power constraints compared to higher voltage alternatives.

Real Time Clock Part Context

This component belongs to the RV-3129-C3 series of Real-Time Clock Modules. The C3 designation specifies the miniature 3.7 x 2.5 x 0.9 mm package size. The series integrates a 32.768 kHz XTAL with a CMOS oscillator and RTC IC, providing a compact solution for precise timekeeping in space-constrained electronic designs requiring hermetic sealing.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Micro Crystal AG directly for qualified replacements or cross-references compatible with the RV-3129-C3 form factor and specifications.