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

Real Time Clock Overview

The RV-3149-C3-32.768KHZ-OPTION-B-TA-QC is a Real-Time Clock (RTC) module from Micro Crystal AG, integrating a CMOS circuit with a 32.768 kHz tuning fork crystal in a hermetically sealed ceramic package. It features a 4-wire SPI interface operating at 1 MHz and supports a supply voltage range of 1.3 V to 5.5 V. The device provides timekeeping accuracy of ±25 ppm across the -40°C to +85°C temperature range. Key specifications include a current consumption of 800 nA at 3 V during timekeeping mode, 2 bytes of non-volatile user memory, and 8 bytes of user RAM.

Real Time Clock Feature Summary

• Hermetically sealed SMT ceramic package with metal lid connected to VSS
• SPI-bus interface: 4-wire, 1 MHz clock speed
• Time accuracy: ±25 ppm @ -40°C to +85°C (Option B)
• Low power consumption: 800 nA typical @ 3 V

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify that the specific ordering suffix matches the required automotive qualification (QA) and extended temperature range (TB) if applicable, as standard versions may differ. Confirm package dimensions are 3.7 x 2.5 x 0.9 mm for PCB layout compatibility. Ensure the supplier provides RoHS compliance documentation and AEC-Q200 certification records for automotive-grade variants.

Real Time Clock Selection Notes

Select Option B for ±25 ppm accuracy or Option A for ±6 ppm accuracy depending on system timing requirements. Choose the TA suffix for -40°C to +85°C operation or TB for -40°C to +125°C extended temperature ranges. Verify that the 1.3 V minimum supply voltage aligns with the target application's power budget and that the 4-wire SPI interface is supported by the host controller.

Real Time Clock Part Context

This component belongs to the RV-3149-C3 series of Real-Time Clock Modules. The 'C3' designation indicates the specific 3.7 x 2.5 x 0.9 mm package size. The series combines a quartz resonator with oscillator and RTC IC functionality in a miniature SMD ceramic package designed for low power and high reliability.

Real Time Clock Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Evaluate alternatives based on matching SPI interface, package footprint (10-VCDFN), and voltage range (1.3V–5.5V).

Real Time Clock FAQ

What is the time accuracy for Option B?

Option B provides a time accuracy of ±25 ppm over the temperature range of -40°C to +85°C.

How is the metal lid connected in the package?

The metal lid is connected to VSS (Ground), which corresponds to pin #6.

What memory capacities does the RV-3149-C3 offer?

The device includes 2 bytes of non-volatile user EEPROM and 8 bytes of user RAM.