DS18B20 1-Wire thermometer pinout

The DS18B20 is an individually addressable 1-Wire temperature sensor with programmable 9- to 12-bit conversion.

TO-92

3 contacts Current package

Analog Devices / Maxim Integrated ·

Bulk, straight leads.

TO-92

Flat face toward you and leads down. Pins 1, 2, and 3 are left to right.

Supply input · Power

Device supply. Place the bypass capacitor close to this pin.

Analog Devices / Maxim DS18B20 Rev. 6, pp. 1–5, 8 and 19.

Pin	Signal	Direction	Function
1	GND Supply return	Supply return	Connect to the common ground plane or bench return.
2	DQ Open drain	Open drain	1-Wire data. The same wire can supply the device in parasite-power mode.
3	VDD Supply input	Supply input	Device supply. Place the bypass capacitor close to this pin.

An open-drain multidrop bus with a unique 64-bit ROM identifier per device. External power keeps DQ available for conversion-status polling.

Parameter	Limit	Conditions and source
External supply3.0–5.5 V	3.0–5.5 V	Tie VDD to ground when using parasite power. Analog Devices / Maxim DS18B20 Rev. 6, pp. 1–5, 8 and 19.
Conversion time750 ms maximum	750 ms maximum	12-bit conversion. Lower resolution settings convert faster. Analog Devices / Maxim DS18B20 Rev. 6, pp. 1–5, 8 and 19.
Temperature accuracy±0.5 °C	±0.5 °C	From −10 to +85 °C. Overall measurement range is −55 to +125 °C. Analog Devices / Maxim DS18B20 Rev. 6, pp. 1–5, 8 and 19.

The three package maps cover the bare sensor. Check polarity separately on cabled probes or third-party modules.

DS18B20 manufacturer documentation· Analog Devices / Maxim DS18B20 Rev. 6, pp. 1–5, 8 and 19.