Interessante Aussage in einer der Funde auf meiner Suche nach Ursachen meiner Probleme:
https://github.com/cpetrich/counterfeit_DS18B20
Above is an example of an authentic, Maxim-produced DS18B20 sensor in TO-92 case.
As of writing (2019), the topmark of original Maxim chips is lasered rather than printed.
The first two rows, DALLAS 18B20, specify that this part is a DS18B20 (Dallas Semiconductor being the original producer), parasitic power-only chips bear the maring DALLAS 18B20P.
The + in the 4th row indicates that the part is RoHS compliant ([1]).
Es gibt also anscheinend Varianten, die AUSSCHLIESSLICH für Parasitäre Versorgung ausgelegt sind!