A programmable-resolution 1-Wire digital thermometer in a TO-92 package. It reports temperature directly as a digital value over a single data line (DQ), so many sensors share one MCU pin, each addressed by its factory-lasered unique 64-bit serial number. It measures -55 to +125 C with plus/minus 0.5 C accuracy over -10 to +85 C, at a user-selectable 9 to 12 bits. A parasite-power mode lets it run from the data line alone (VDD tied to GND), needing just two wires plus a pull-up.

Pinout

Pin	Name	Type	Function
1	GND	power_in	Ground return. In parasite-power mode VDD is also tied to GND; when powered externally via VDD, GND must not be floating.
2	DQ	bidirectional	1-Wire data input/output. Open-drain, requires ~4.7 kΩ pull-up to VDD (3.0-5.5 V). Can source parasite power to the die when held high (up to ~1.5 mA during a conversion, which typically requires a strong MOSFET pull-up).
3	VDD	power_in	Optional external power supply, 3.0 V to 5.5 V. If tied to GND the device runs in parasite-power mode, drawing power from the DQ line. Recommended for reliable operation above 100 °C.

Key specifications

Parameter	Value
Type	1-Wire digital temperature sensor
Range	-55 to +125 °C
Accuracy	±0.5 °C (-10 to +85 °C)
Resolution	9-12 bit (programmable)
Interface	1-Wire (single data line)
Addressing	unique 64-bit lasered ID
Power	3.0-5.5 V or parasite
Package	TO-92 (3-lead)

Ordering variants

Same part, different packaging or reel option.

DS18B20 (TO-92)
DS18B20+ (TO-92, RoHS)

CAD (KiCad official)

Symbol: Sensor_Temperature:DS18B20
Footprint: Package_TO_SOT_THT:TO-92_Inline
3D model: TO-92 (KiCad packages3D)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Analog Devices datasheet (27 pp, sha256 b4ecd22913b1670d, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF