0
\$\begingroup\$

I'm trying to create my own circuit around this schematic. Its from a Waveshare 1,54inch E-paper display. I want to create my own board for this display, but I'm confused about what MOSFET this circuit uses.

It clearly lists that a Si1304BDL from Vishay Siliconix is used which is a N-channel enhancement mode MOSFET, but the symbol in the circuit diagram specifies a N-channel depletion mode MOSFET.

Here is an image of the MOSFET and the part number lines up with that of the datasheet.

MOSFET on Waveshare E-paper development board

I'm pretty sure it's a N-channel enhancement mode MOSFET, but I just want to be sure.

Thanks for your time!

\$\endgroup\$
2
  • 2
    \$\begingroup\$ Very likely they just drew the circuit diagram wrong. It's much less likely they got the part number wrong, while the wrong symbol used can be just sloppiness/carelessness. \$\endgroup\$
    – anrieff
    Jul 3, 2018 at 21:13
  • \$\begingroup\$ The symbol for MOSFETs is a bit of a strange one. While there are strict standards saying how to make it and what it means, people butcher it all the times - sometimes with more valid reasons than others. Seeing people draw the ''depletion mode'' symbol for enhancement mode is something I see a lot, and many don't even realize there is a difference. \$\endgroup\$
    – Joren Vaes
    Jul 4, 2018 at 5:33

2 Answers 2

Reset to default
2
\$\begingroup\$

You can use a 'DMN3067LW' as replacement for the obsolete SI1304. It works fine on our selfmade boards.

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

Somebody made an error in choosing the library symbol for an old obsolete part.

enter image description here

\$\endgroup\$

Your Answer

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

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