I want to do a composite video mod for a Colecovision. The mod (http://www.benheck.com/Games/Coleco/Video_Mod.htm) calls for an NPN 2N4401-ND.

The only NPN transistor I currently have is the 2N3904. However, the pins are reversed.

Could I simply flip the transistor around and use it? So that the pin that goes to the collector goes to my collector, etc.?


  • 2
    \$\begingroup\$ The 2n3904 & 2n4401 have the same pinout. We use them interchangeably in places where either will work. \$\endgroup\$ – Dwayne Reid Apr 7 '15 at 0:09

According to these two datasheets, one for the 2N3904 and the other for the 2N4401, they have the same pin configuration, namely E B C with the flat side facing you.

enter image description here

Looking at the other parameters of the datasheets, they look very similar (the h\$_{FE}\$ of the 2N3904 is just slightly higher), so you should be able to get by with the substitution.

| improve this answer | |
  • \$\begingroup\$ Yep. I must have had the wrong datasheet or something because I read it as being opposite. But the video mod worked like a treat with that transistor. Now I have composite video/audio on my ColecoVision! Sweet. \$\endgroup\$ – cbmeeks Apr 8 '15 at 12:19

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