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The datasheet for the DS3231 explains that this part is an "Extremely
Accurate IC-Integrated RTC/TCXO/Crystal". And, hey, it does exactly
what it says on the tin! This Real Time Clock (RTC) is the most
precise you can get in a small, low power package.

Most RTCs use an external 32kHz timing crystal that is used to keep
time with low current draw. And that's all well and good, but those
crystals have slight drift, particularly when the temperature changes
(the temperature changes the oscillation frequency very very very
slightly but it does add up!) This RTC is in a beefy package because
the crystal is inside the chip! And right next to the integrated
crystal is a temperature sensor. That sensor compensates for the
frequency changes by adding or removing clock ticks so that the
timekeeping stays on schedule.

This is the finest RTC you can get, and now we have it in a compact,
breadboard-friendly breakout. With a coin cell plugged into the back,
you can get years of precision timekeeping, even when main power is
lost. Great for datalogging and clocks, or anything where you need to
really know the time.

Comes as a fully assembled and tested breakout plus a small piece of
header. You can solder header in to plug it into a breadboard, or
solder wires directly.

A coin cell is required to use the battery-backup capabilities! We
don't include one by default, to make shipping easier for those
abroad, but we do stock them so pick one up or use any CR1220 you have

Technical Details:

* 23mm x 17.6mm x 7.2mm / 0.9" x 0.7" x 0.28"
* Weight: 2.1g


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General information

Manufacturer Adafruit
Product type Electronics modules
Item number5998571
Manufacturer no.ada-3013

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Returns and warranty

Warranty 24 month Bring-in
30-day right of return

30-day right of return

This product may be returned within 30 days after shipment or collection. A minimum of 10% will be deducted from opened products. Unfortunately, we cannot accept a product if it is damaged, incomplete or missing its original packaging.

Returns and warranty

Please use our simplified returns and warranty process to return a product or register a warranty case. Returns and warranty

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Mail delivery

 Expected delivery time: approx. 8–10 days
Currently > 5 piece(s) in stock at the supplier


All locations

 Expected delivery time: approx. 8–10 days
Currently > 5 piece(s) in stock at the supplier

If ordered immediately.
Information subject to change.

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Adafruit DS3231 Precision RTC Breakout Adafruit DS3231 Precision RTC Breakout