I asked chat GPT, and it said TCRT1000 and TCRT5000 are not suited for ops above 5V. But interestingly I have read a research paper where TCRT1000 has been used at 9V. I would like help decoding these datasheets and understanding whether its safe to use these sensors at 12V, I don't really trust Chatgpt, its lies ten times in a line. I am mainly interested in powering the Phototransistor via 12V, even if the IR lamp is powered via 5V.

 

Why would it be necessary to observe 5v only?
As long as the relative current values/limits are observed, there should be no problem?
I don't see the limit on the sheet?

 

Figured it out through help at another forum, its 32V for TCRT1000 and 70V for TCRT5000. Need to watch value under Vceo in datasheets.

 

Both of those sensors have the maximum rated voltage on their datasheets listed as 32V and 70V ...

 

The maximum emitter to collector voltage is 5V for TCRT5000.

https://datasheetspdf.com/pdf/377371/VishayTelefunken/TCRT5000/1

 

The 5 volt maximum voltage rating is with the polarity reversed to that in normal operation.
In normal operation the collector is connected to positive and the emitter to negative. The 5 volts rating is if the emitter is positive and the collector negative.

Les.