DS18B20-compatible TO-92 temperature sensor, flat face marked 18B20 with three straight tinned leads

DS18B20-Compatible Digital Temperature Sensor - TO-92, 1-Wire

$1.99 NZD
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DS18B20-compatible TO-92 temperature sensor, flat face marked 18B20 with three straight tinned leads
  • DS18B20-compatible TO-92 temperature sensor, flat face marked 18B20 with three straight tinned leads
  • Rounded back of the TO-92 sensor body, showing the moulding dimple and lead spacing
  • Pinout with the flat face towards you and leads down: pin 1 GND, pin 2 DQ data, pin 3 VDD
  • Approximate size: body about 4.7 mm wide and 5 mm tall, leads about 15 mm long at 1.27 mm pitch
DS18B20-Compatible Digital Temperature Sensor - TO-92, 1-Wire
SKU: NZE-DS18B20-TO92

DS18B20-Compatible Digital Temperature Sensor - TO-92, 1-Wire

$1.99 NZD
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A bare DS18B20-compatible digital temperature sensor in a three-lead TO-92 package. It sends readings over a single 1-Wire data line, so one pin on an Arduino, ESP32 or Raspberry Pi can read several sensors. Use it on a breadboard or PCB, or seal it into your own probe. It needs a 4.7k pull-up resistor on the data line.

Specifications

SensorDS18B20-compatible, 1-Wire
PackageTO-92, 3 straight leads
PinoutGND, DQ, VDD (flat face towards you, leads down)
Supply3.0 to 5.5V, works on 3.3V and 5V boards
Resolution9 to 12 bit, 0.0625°C steps at 12 bit
Conversion timeUp to 750 ms at 12 bit
Data lineNeeds a 4.7k pull-up to the supply (not included)
Measuring range-55 to +125°C (DS18B20 family rating)
SizeBody about 4.7 x 5 mm, leads about 15 mm at 1.27 mm pitch

Datasheets

Full technical datasheet PDF

What's in the box

1×
DS18B20-compatible TO-92 temperature sensor

Bare sensor in an anti-static bag. The pull-up resistor and wiring are not included.

Great for

Logging room or enclosure temperature with an ESP32
Reading several temperature points from one Arduino pin
Building your own sealed temperature probe
Switching a fan or heater from a thermostat sketch
Watching heatsink or battery pack temperature
Raspberry Pi temperature readings over 1-Wire

Wiring & getting started

  1. Find the pins

    Hold the sensor with the flat face towards you and the leads pointing down. From left to right the pins are GND, DQ (data) and VDD.

  2. Power it from your board's logic voltage

    Connect VDD to 5V on an Arduino Uno or Nano, or to 3.3V on an ESP32 or Raspberry Pi. Connect GND to GND. Swapping VDD and GND makes the sensor hot quickly, so check before powering up.

  3. Add the 4.7k pull-up

    Fit a 4.7k resistor between DQ and VDD, then connect DQ to a digital pin, such as D2 on an Arduino or GPIO4 on an ESP32 or Pi. Our DS18B20 adapter module has the pull-up fitted and a screw terminal for the leads.

  4. Read it

    Install the OneWire and DallasTemperature libraries in the Arduino IDE and open the Simple example. Allow the full conversion time, up to 750 ms at 12 bit, before each reading.

Note: This is a DS18B20-compatible sensor. It uses the same pinout, commands and libraries, but compatible parts can differ in accuracy and conversion timing. Use normal three-wire power rather than parasite power, and check it against a known thermometer if accuracy matters. For wet or outdoor use, see our DS18B20-compatible waterproof temperature probe.
Related guide DHT22 vs DS18B20 vs BMP280: Which Sensor Should You Choose?Choose a sensor for air temperature, humidity, remote temperature or pressure. Compare DHT22, DS18B20 and BMP280, with practical wiring and placement checks.

Frequently Asked Questions

Answers to the questions buyers ask most.

Do I need a pull-up resistor?
Yes. Fit a 4.7k resistor between DQ and VDD, so the data line idles high. One resistor per data line is enough, even with several sensors. Our DS18B20 adapter module has the 4.7k pull-up already fitted.
Will it work with an ESP32 or Raspberry Pi on 3.3V?
Yes. Power VDD from 3.3V and connect the pull-up to 3.3V as well, so the data line stays at 3.3V logic. On an Arduino Uno or Nano use 5V for both.
Is it an original DS18B20?
No. It is a DS18B20-compatible sensor with the same pinout, 1-Wire commands and Arduino libraries. Compatible parts can differ in accuracy and conversion timing, so allow the full conversion time and check readings against a known thermometer if accuracy matters.
Can I use parasite power with two wires?
We suggest normal three-wire power with VDD connected to your supply. Parasite power is less dependable with compatible sensors, especially on long cables.
Is it waterproof?
No, it is a bare chip with exposed leads. Seal the sensor and joints with heat-shrink or potting for damp places, or use our DS18B20-compatible waterproof probe.
Why does it read -127 or 85 degrees?
-127 means the library found no sensor: check the pull-up, the pin order and the pin number in your sketch. 85 is the power-up value, read before a conversion finished: wait up to 750 ms at 12 bit before reading.
How many sensors can share one pin?
Several. Each sensor has its own 64-bit address, so you can wire them in parallel on the same three lines and read each one by address. Keep the wiring tidy and use external power on longer runs.

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