The DS18B20+ from Analog Devices Inc./Maxim Integrated is the classic 1-Wire programmable-resolution digital thermometer in a through-hole TO-92-3 package. It measures local temperature from -55°C to +125°C with a highest accuracy of ±0.5°C (worst case ±2°C) and converts it to a 12-bit digital reading. The 12-bit resolution is programmable, so you can trade conversion time against measurement granularity; the programmable limit registers and integrated output switch let it act as a standalone thermostat that flags an alarm without the host polling constantly. Because it uses the 1-Wire interface, the DS18B20 needs just one data wire plus ground, and each part carries a unique factory-lasered 64-bit serial code — you can hang many sensors on a single bus and address them individually, which is why this part has been a staple of multi-point temperature sensing for decades.
Operating from a wide 3V to 5.5V supply, the DS18B20+ is easy to power from a microcontroller rail and stays within its -55°C to +125°C operating range in freezers, oven-adjacent enclosures, and outdoor boxes. Common uses include HVAC and refrigerator controllers, battery-pack thermal monitoring, industrial over-temperature protection, and 1-Wire sensor networks where long cable runs and per-sensor addressing matter more than raw speed. When you select it, keep in mind the "+" suffix is the lead-free TO-92 version, and because it is a through-hole part it suits prototyping, socketed modules, and low-volume production better than high-density SMT. For a digital local temperature sensor that is simple to wire, cheap to deploy across many points, and has decades of design-in support, the DS18B20+ remains the reference part.