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

Real Time Clock Overview

The RV-3149-C3-32.768KHZ-OPTION-B-TA-QA 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 an SPI-bus interface and operates within 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 electrical parameters include a maximum current consumption of 1000 nA at 3 V during timekeeping mode and support for automatic backup switchover.

Real Time Clock Feature Summary

• Integrated 32.768 kHz XTAL with CMOS RTC IC in a hermetically sealed SON-10 package
• SPI-bus interface supporting 4-wire communication up to 1 MHz
• Time accuracy of ±25 ppm from -40°C to +85°C (Option B)
• Includes 2 bytes non-volatile EEPROM and 8 bytes user RAM

Real Time Clock Applications

• IoT devices
• Metering systems
• Industrial equipment
• Automotive electronics
• Health care devices

Real Time Clock Procurement Notes

Verify that the specific ordering suffix matches the required automotive qualification (QA), extended temperature range (TB), and time accuracy option (B). Confirm package dimensions are 3.7 x 2.5 x 0.9 mm. Ensure compatibility with IPC/JEDEC J-STD-020C soldering standards for Au flashed pads.

Real Time Clock Selection Notes

Select Option B when ±25 ppm accuracy is sufficient for the application. Choose the TB suffix if operation beyond +85°C up to +125°C is required. Verify that the system supports the 4-wire SPI protocol and can handle the 1 MHz clock speed. Ensure power supply rails remain within the 1.3 V to 5.5 V operating window.

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 logic circuits to provide precise timekeeping functions in a miniature surface-mount form factor.

Real Time Clock Replacement Considerations

Check pinout compatibility for direct replacement. Verify that alternative RTCs support the same SPI interface and voltage ranges. Ensure substitute components meet the required AEC-Q200 automotive qualification if applicable.