# One Wire Digital Temperature Sensor - DS18B20

**Type:** Product page · **SKU:** SEN-00245 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/one-wire-digital-temperature-sensor-ds18b20.html ([markdown](https://core-electronics.com.au/one-wire-digital-temperature-sensor-ds18b20.html.md))

## Retired product

This product is retired and no longer available for purchase. Replaced by: ADA374.

**Replacement:** https://core-electronics.com.au/catalog/product/view/sku/ADA374

## Description

This is the latest DS18B20 1-Wire digital temperature sensor from Maxim IC. Reports degrees C with 9 to 12-bit precision, -55C to 125C (+/-0.5C). Each sensor has a unique 64-Bit Serial number etched into it - allows for a huge number of sensors to be used on one data bus. This is a wonderful part that is the corner stone of many data-logging and temperature control projects.

Features:

- Unique 1-Wire® interface requires only one port pin for communication
- Each device has a unique 64-bit serial code stored in an onboard ROM
- Multidrop capability simplifies distributed temperature sensing applications
- Requires no external components
- Can be powered from data line. Power supply range is 3.0V to 5.5V
- Measures temperatures from –55°C to +125°C (–67°F to +257°F)
- ±0.5°C accuracy from –10°C to +85°C
- Thermometer resolution is user-selectable from 9 to 12 bits
- Converts temperature to 12-bit digital word in 750ms (max.)
- User-definable nonvolatile (NV) alarm settings
- Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
- Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system
 
**Documents:**

- [Datasheet](https://cdn.sparkfun.com/assets/4/a/8/8/8/DS18B20.pdf)
- mbed Example
- Bildr Tutorial
 
**Replaces:**[SEN-008366](https://core-electronics.com.au/search/?q=08366)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/o/n/one_wire_digital_temperature_sensor_-_ds18b20__sen-00245__01.jpg)