Adafruit PCF8523 RTC Assembled Breakout Board



  • Adafruit
Availability: In Stock

This is a simple little real time clock (RTC) breakout board based on the PCF8523 chipset. The breakout allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. It is perfect for datalogging, clock-building, time stamping, timers and alarms, etc. This new version of the board now includes STEMMA QT / Qwiic connectors making this easier than ever to use!


SKU: BOB-089 Manufacturer: Adafruit Industries Mfg Part Number: 5189 Category: Tags: , , , , ,


The PCF8523 is a simple, low cost, real time clock (RTC) chip. Unlike the fancier (and much more expensive) RTCs out there, this chip is not temperature compensated and may lose or gain up to 2 seconds a day. If you need a more accurate RTC we do recommend looking at the DS3231 instead.

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

  Difficulty Level

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

  Product Certifications

  Product Attributes

Weight: 5 g
Shipping Dimensions: 25.4 × 17.8 × 7.8 mm
I2C Address:


Logic Voltage:

3.3V, 5.0V

Input Voltage:

3.3 VDC, 5.0 VDC

  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 Final Sale and cannot be returned once purchased. 

More Information:
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