RV-3149-C3-32.768KHZ-OPTION-B-TB-QC

Real Time Clock Overview

The RV-3149-C3-32.768KHZ-OPTION-B-TB-QC is a surface-mount Real-Time Clock (RTC) module integrating a CMOS circuit with a 32.768 kHz tuning fork crystal. It operates within a hermetically sealed ceramic package measuring 3.7 x 2.5 x 0.9 mm. The device supports a supply voltage range of 1.3 V to 5.5 V and consumes 800 nA at 3 V during timekeeping. It features an SPI-bus interface with 4-wire serial communication up to 1 MHz. Time accuracy is specified at ±25 ppm across the -40°C to +85°C temperature range, with extended operation supported up to +125°C.

Real Time Clock Feature Summary

• Hermetically sealed SMT ceramic package with metal lid connected to ground
• SPI-bus interface supporting 4-wire serial communication at 1 MHz
• Automatic backup switchover and trickle charger functionality
• Integrated temperature sensor with programmable high/low alarms

Real Time Clock Applications

• Internet of Things (IoT)
• Metering
• Industrial systems
• Automotive electronics
• Health care devices

Real Time Clock Procurement Notes

Verify that the ordering suffix TB confirms the extended operating temperature range of -40°C to +125°C. Confirm Option B provides the specific ±25 ppm time accuracy required for the application. Ensure the QC designation aligns with commercial grade requirements rather than automotive AEC-Q200 qualification.

Real Time Clock Selection Notes

Select this model when extended temperature stability up to +125°C is necessary. The Option B specification limits time accuracy to ±25 ppm between -40°C and +85°C. Use Option A if tighter accuracy of ±6 ppm is required but extended temperature operation above +85°C is not needed. Verify power supply constraints against the 1.3 V minimum threshold.

Real Time Clock Part Context

This component belongs to the RV-3149-C3 series of RTC modules from Micro Crystal AG. The C3 designation indicates the specific 3.7 x 2.5 x 0.9 mm package size. The part integrates the oscillator and RTC logic into a single miniature unit, eliminating the need for external discrete components typically required in standard RTC designs.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Replacement requires matching the 10-pin VCDFN footprint, SPI interface protocol, and voltage specifications.