# Adafruit DS1307 Real Time Clock Assembled Breakout Board

**Type:** Product page · **SKU:** ADA3296 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/adafruit-ds1307-real-time-clock-assembled-breakout-board.html ([markdown](https://core-electronics.com.au/adafruit-ds1307-real-time-clock-assembled-breakout-board.html.md))

This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is...

## Pricing

- **Price:** $13.70 (inc GST) — $12.45 AUD, exc GST
- **Quantity discounts:** 10+ $12.08 (exc GST) · 50+ $11.84 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 3 today, and up to 41 more in 8–12 days.

## Restrictions

Restrictions apply to this equipment as it uses button/coin cell batteries:

- The equipment is intended to be used in trades, professions or industries
- The equipment is not intended for sale to the general public
- The equipment is not intended to be used where children are present
- You are aware that this equipment may not meet child safety testing requirements as it is not intended to be used by consumers or general public, but rather, is intended to be used in trades, professions or industries in conjunction with the limitations and restrictions listed above
- You are aware that these restrictions are due to a change in [A](https://www.accc.gov.au/media-release/businesses-on-notice-as-mandatory-button-battery-laws-commence)[ustralian legislation in 2022](https://www.accc.gov.au/media-release/businesses-on-notice-as-mandatory-button-battery-laws-commence) for button/coin cell batteries
 
![Button Battery Warning](https://core-electronics.com.au/attachments/uploads/iec-button-battery.png)

A declaration of use will need to be submitted during checkout.

## Description

This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. The **DS1307** is the most popular RTC - but it *requires* 5V power to work (although Adafruit have used it with 5V power and 3.3V logic successfully)

Works great with an [Arduino using Adafruit's RTC library](https://github.com/adafruit/RTClib) or with a [Raspberry Pi (or similar single board linux computer)](https://learn.adafruit.com/adding-a-real-time-clock-to-raspberry-pi)

- PCB & header are included
- Plugs into any breadboard, or you can use wires
- Two mounting holes
- Will keep time for 5 years or more

**Note: This product does not come with a CR1220 coin cell battery. [Adafruit recommend you purchase a coin cell battery to use with this product.](https://core-electronics.com.au/cr1220-replacement-battery-for-icufflinks-inecklace.html)**

The DS1307 is simple and inexpensive but not a high precision device. It may lose or gain up to 2 seconds a day. For a high-precision, temperature compensated alternative, [please check out the DS3231 precision RTC](https://core-electronics.com.au/adafruit-ds3231-precision-rtc-breakout.html). If you do not need a DS1307, or you need a 3.3V-power/logic capable RTC please check out Adafruit's affordable [PCF8523 RTC breakout](https://core-electronics.com.au/adafruit-pcf8523-real-time-clock-assembled-breakout-board.html)

## Technical Details

Dimensions:

- Length: 25.8mm/1.02in
- Width: 21.7mm/0.85in
- Height: 5mm/0.2in
- Weight: 2.3g/0.09oz
- Mounting holes are 2.2mm(0.086in) diameter, 25mm(0.98in) apart
- This board/chip uses I2C 7-bit address 0x68

 ![](https://core-electronics.com.au/attachments/localcontent/rohs_icon_8216055e11.jpg)

## Guides for this product

- [Weather Station with Arduino Tutorial](https://core-electronics.com.au/guides/arduino/weather_station_with_arduino_tutorial/)

## Videos for this product

- [Weather Station with Arduino Tutorial](https://core-electronics.com.au/videos/weather-station-with-arduino-tutorial)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/3/2/3296-00.jpg)