1
\$\begingroup\$

How can I know the maximum voltage input for transistor. I look at datasheet. But confusing me little bit. Which is for maximum voltage. Afraid that might burn the transistor. Btw, my input circuit is 48V and current needed is 30mA. enter image description here

\$\endgroup\$

2 Answers 2

0
\$\begingroup\$

Use Vceo for general purpose requirements.

That kind of 8050-type transistor is optimized for lower voltages.

If you actually need to switch the 48V at low current, then a 160V MMBT5551 is a reasonable low-cost and multiple-sourced choice.

If your input is 48V and you are switching lower voltage than 25V (minus a safety margin) then the one you’ve shown will work, but as always, you will need a base resistor to limit the current since the Vbe will be about 0.7V when on (and applying much more than that will destroy the transistor).

\$\endgroup\$
0
\$\begingroup\$

The parameter that matters is collector-emitter voltage (Vceo). This is listed at 25V. You will need a different transistor to work with 48V.

Emitter-base voltage won’t be much more than 0.7V normally.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.