Adafruit DS3231 Precision RTC – STEMMA QT / Qwiic



  • Adafruit
Availability: Temporarily Out Of Stock

The DS3231 RTC Breakout is an extremely accurate, easy to use, real time clock. It is accurate to +/- 2 minutes per year and has a battery backup.

Out of Stock - Available on Backorder

SKU: BOB-083 Manufacturer: Adafruit Industries Mfg Part Number: 5188 Category: Tags: , , , , ,


The DS3231 Precision RTC Breakout is exactly what it says – an extremely accurate Real Time Clock. Unlike many of the cheaper RTCs, this Maxim DS3231 RTC is temperature compensated to ensure that it keeps time as accurately as possible. When operated between -40 to 85°C this clock will hold time to +/- 2 minutes per YEAR.

The RTC completely manages all timekeeping functions; it counts seconds, minutes, hours, date of the month, month, day of the week, and even has leap year compensation to the year 2100. To keep time while your project’s main power is off, this RTC has a battery backup that takes over as soon as external power is lost.

The DS3131 breakout connects over I2C and is very easy to hook up. The RTC can be powered from 2.3V to 5.5V power, you do not need a regulator or level shifter for 3.3V or 5V logic/power. To power the board, give it the same power as the logic level of your microcontroller (5V for most Arduino, 3.3V for the Raspberry Pi). As always, Adafruit has an excellent tutorial and documentation – we have listed this below!

This breakout uses a CR1220 battery. Due to shipping regulations, a battery is not included


  • +/- 2 minutes per year accuracy
  • Simple I2C interface
  • Battery backup (CR1220)
  • Temperature compensated
  • Weight: 2.5g
  • No Soldering Required

Package Contents

  • 1 x Adafruit DS3231 Precision RTC - STEMMA QT / Qwiic
  • 1 x 8 Pin 2.54mm Pitch Header

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  Difficulty Level

Soldering Skill: Beginner
Prototyping Skill: Beginner
Programming Skill: Beginner

  Product Certifications

  Product Attributes

Weight: 4 g
Shipping Dimensions: 26 × 18 × 8 mm
Battery Cell Size:




I2C Address:




Input Voltage:

2.3 – 5.5 VDC

Logic Voltage:

3.3V, 5.0V







  Warranty Policy

This product has a 30 Day Warranty from the date of delivery. The item must not be modified, abused, incorrectly hooked up, or used for purposes outside the original scope of design.

  Return Policy

This product is returnable Within 14 Days of delivery for a store credit. Item must be unopened, unused, and in re-saleable condition.

More Information:
For more information on our Warranty and Return Policies, please consult our   Terms of Service


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