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Manufacturer Part #


M41T93 Series 5.5 V SPI Surface Mount Real Time Clock - SOX-18

ECAD Model:
Mfr. Name: STMicroelectronics
Standard Pkg:
Product Variant Information section
Date Code: 2212
Product Specification Section
STMicroelectronics M41T93RMY6F - Technical Attributes
Attributes Table
Date Format: DW:DM:M:Y
Time Format: HH:MM:SS:hh
Interface: SPI
Non-Volatile Memory Size: 7B
SRAM Size: 7b
Supply Voltage-Nom: 2.7V to 5.5V
Temperature Grade: Industrial
Operating Temp Range: -40°C to +85°C
Storage Temperature Range: -55°C to +125°C
Package Style:  SOX-18
Mounting Method: Surface Mount
$Features & Applications

The M41T93RMY6F is a part of M41T series I2C RTC. It has an operating temperature ranging from -40 °C to +85 °C and it comes in SOIC-18 Packaging.

The M41T93 is a low-power serial SPI bus real-time clock with a built-in 32.768 kHz oscillator (external crystal-controlled for the QFN16 package, and embedded crystal for the SOX18 package). Eight bytes of the register map are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 17 bytes of the register map provide status/control of the two alarms, watchdog, 8-bit counter, and square wave functions. An additional seven bytes are made available as user SRAM.


  • Ultra-low battery supply current of 365 nA
  • Factory calibrated accuracy ±5 ppm guaranteed after 2 reflows (SOX18)
    • Much better accuracies achievable using built-in programmable analog and digital calibration circuits
  • 2.0 V to 5.5 V clock operating voltage
  • Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
  • Automatic switchover and reset output circuitry (fixed reference)
    • M41T93R: VCC= 2.7 V to 5.5 V (2.55 V ≤ VRST≤ 2.70 V)
  • Compatible with SPI bus serial interface (supports SPI mode 0 [CPOL = 0, CPHA = 0])
  • Programmable alarm with interrupt function (valid even during battery back-up mode)
  • Optional 2ndprogrammable alarm available
  • Square wave output (defaults to 32 KHz on power-up)
  • RESET (RST) output
  • Watchdog timer
  • Programmable 8-bit counter/timer
  • 7 bytes of battery-backed user SRAM
  • Battery low flag
  • Power-down time stamp (HT bit)
  • Low operating current of 80 μA
  • Oscillator stop detection
  • Battery or SuperCap™ backup
  • Operating temperature of –40 °C to +85 °C
  • Package options include:
    • a 16-lead QFN or an 18-lead embedded crystal SOIC
  • RoHS compliance: lead-free components are compliant with the RoHS directive
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Product Variant Information section