BU9873FJ-GT

Overview

The BU9873FJ-GT is a Real-Time Clock (RTC) IC manufactured by Rohm Semiconductor, featuring an I²C bus serial interface. It supports date formats of YY-MM-DD-DD and time formats of HH:MM:SS in both 12-hour and 24-hour modes. The device operates within a supply voltage range of 1.8V to 5.5V and includes built-in oscillation stabilizing capacitors. Key electrical parameters include a minimum operating temperature of -40°C and a maximum of 85°C. The package type is SOP-J8 with dimensions of 4.9x6.0mm.

Feature Summary

• Built-in high-precision oscillation adjustment circuit for ±30 second accuracy compensation
• Automatic leap year recognition capability extending up to the year 2099
• Integrated periodic interrupt function allowing output ranging from one second to one month
• Oscillation halt sensing function to detect crystal failure

Applications

• Consumer electronics requiring precise timekeeping
• Industrial equipment needing calendar and alarm functions
• Battery-powered devices utilizing low standby current

Procurement Notes

Verify component authenticity through official Rohm channels or authorized distributors. Confirm the specific suffix matches the required package variant. Check for end-of-life status as availability may be limited. Ensure environmental compliance documentation aligns with project requirements.

Selection Notes

Select this RTC when I²C connectivity and high-precision calibration are required. Consider the SOP-J8 package constraints for PCB layout. Evaluate power consumption against system battery life expectations. Verify compatibility with host CPU I²C clock speeds.

Part Context

This component belongs to the BU9873 family of real-time clocks designed for general-purpose applications. It shares functional similarities with other ROHM RTCs but offers specific package and interface configurations tailored for compact designs.

Replacement Considerations

BU9873FVM-GTTR is a documented similar level replacement with identical pinout and package.