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Manufacturer Part #


M41T Series 2 V Surface Mount Serial I2C Real Time Clock with Alarm - SOIC-8

Product Specification Section
Technical Attributes
Attributes Table
Date Format: DW:DM:M:Y/Binary
Time Format: HH:MM:SS:hh/Binary
Interface: Serial
Non-Volatile Memory Size: 20B
Supply Voltage-Nom: 2V to 5.5V
Temperature Grade: Industrial
Operating Temp Range: -40°C to +85°C
Storage Temperature Range: -55°C to +125°C
Package Style:  SOIC-8
Mounting Method: Surface Mount
Features & Applications

The M41T81M6F is a part of M41T81 series Non Volatile SRAM .It has an operating temperature ranging from -40 °C to +85 °C and it comes in SOIC-8 Packaging.

The M41T81 is a low-power serial RTC with a built-in 32.768 kHz oscillator (external crystal controlled). Eight bytes of the SRAM are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 bytes of SRAM provide status/control of alarm, watchdog and square wave functions. Addresses and data are transferred serially via a two line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.


  • Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
  • 32 kHz crystal oscillator with integrated load capacitance (12.5 pf) which provides exceptional oscillator stability and high crystal series resistance operation)
  • Oscillator stop detection (monitors clock operation)
  • Serial interface supports I2C bus (400 kHz protocol)
  • Ultra-low battery supply current of 0.6 μA (typ)
  • 2.0 to 5.5 V clock operating voltage
  • Automatic switchover and deselect circuitry (fixed reference) which provides full operation in 3.0 V applications)
  • VCC = 2.7 to 5.5 V
  • 2.5 V ≤ VPFD ≤ 2.7 V
  • Power-down time stamp (HT bit) which allows determination of time elapsed in battery backup
  • Battery low flag
  • Programmable alarm and interrupt function (valid even during battery backup mode)
  • Accurate programmable watchdog timer (from 62.5 ms to 128 s)
  • Software clock calibration (to compensate for crystal deviation due to temperature)
  • Operating temperature of –40 to 85 °C
  • Package options include an 8-lead SOIC or 18-lead embedded crystal SOIC
Pricing Section
Web Price:
$2.75 USD Each
Cost Per Unit

$7.00 reeling fee is amortized over the number of components for each reel.
Mini-Reels are a custom product and are non-cancelable and non-returnable.