Electronics > Beginners
Help to choose the right digital pre-biased transistor
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ogden:

--- Quote from: Tantalum on March 19, 2019, 03:12:05 pm ---I thought it was the purposes of digital/pre-biased transistors . That's what I read somewhere else.

--- End quote ---

Biasing is for amplifiers, not logic. Knowing that there are internet search engines helps same way as knowing that earth is round ;)

https://www.electronics-tutorials.ws/transistor/tran_4.html


--- Quote ---Initially I wanted to reduce the number of components, that's why I found those chips interesting.

--- End quote ---

Nah. General purpose transistors with generic resistors are much more interesting - because you can use them any way you want, in this project and in next to come.
janoc:

--- Quote from: Tantalum on March 19, 2019, 03:12:05 pm ---1. Wrong math...
2. Earth is round, do you know that?

But anyway, thanks to have upped my topic again  :-+

--- End quote ---

My bad, missed that am/pm mark. Still, this is extremely annoying and a bad form. If you are in such a hurry, hire a consultant!
bionic:
I recommend that you fiddle around with biasing a BJT. It is a good practice when it comes to analogue calculations or discrete in this case.
Pete66:
I have used DTC143E for this in the past.  I don't recommend using these.  The problem is they cannot be tested in diode mode like regular transistors.  So if you have an issue good luck testing them.

Here are the ones I used:
https://www.rohm.com/products/transistors/digital-transistors/standard/dtc143ee-product
Tantalum:
Thanks for your answer. I switched back to mosfet  :)
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