M41T01M6F Real Time Clock IC – Low Power Serial RTC with Battery Switchover – SOIC-8 – ST

The M41T01M6F Real Time Clock (RTC) IC from STMicroelectronics is a low-power serial RTC designed for precise and reliable timekeeping in embedded applications. With a built-in power-sense and automatic battery switchover circuit, it ensures continuous RTC operation during main power failures, making it ideal for systems requiring long-term time retention.

Operating over a wide voltage range of 2.0V to 5.5V, the M41T01M6F integrates full timekeeping functions, including seconds, minutes, hours, day, date, month, year, and century counters, along with automatic leap-year compensation. Its ultra-low battery supply current of 800 nA (typical) enables more than 5 years of backup time with a small lithium cell.

Using a standard I²C two-wire serial interface, the IC easily connects to microcontrollers for seamless integration in real-time applications such as data loggers, industrial controls, power systems, and embedded devices.

Features / Specs

• Operating Voltage: 2.0V to 5.5V

• Low Operating Current: 300 µA (typical)

• Ultra-low Battery Supply Current: 800 nA (typical)

• Built-in power sense circuit for automatic battery switchover

• Integrated 32.768 kHz oscillator (no external load capacitors required)

• Complete timekeeping counters:

  • Seconds, Minutes, Hours

  • Day, Date, Month, Year, Century

• Automatic leap year compensation

• Supports software clock calibration

• Backup Options: Lithium battery or capacitor

• Data retention: >5 years with 50 mA/h 3V cell

• Interface: I²C (2-wire serial)

• Operating Temperature: –40°C to +85°C

• Package: SOIC-8

Applications

• Real-time event logging

• Low-power embedded systems

• Industrial automation

• Power outage timekeeping

• Smart meters & IoT devices

• Consumer electronics

Package Includes

1 × M41T01M6F RTC IC – Low Power Serial RTC – ST – SOIC-8

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