The DS18B20 comes in different forms and shapes, so you have plenty of choice when deciding which one works best for you. There are 3 variations available: 8-Pin SO (150 mils), 8-Pin µSOP, and 3-Pin TO-92. If you look at online shop, some friends have packaged the TO-92 version in a waterproof housing so you can use it directly in your fish-tank, water boiler, outside your house or even your freezer, without having to worry about water/moisture shortcutting your electronics (these have 3 wires: Black (GND), Red (Vdd) and white or yellow (Data)).
