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Found on a decoder for digital model trains.

Acts probably as a driver to power the motor. There a two of this kind on the board. One burned, the train drives only in one direction.

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  • \$\begingroup\$ Welcome to SE EE, unfortunately questions like this (where can I buy this component?) are off topic, see: electronics.stackexchange.com/help/dont-ask \$\endgroup\$ – Bimpelrekkie Oct 26 '17 at 8:03
  • \$\begingroup\$ Okay, I revised it. \$\endgroup\$ – Rainer Oct 26 '17 at 8:07
  • \$\begingroup\$ I can't tell what I see here. It might as well be a fet or transistor. Can you post a sharp photo of a larger area of the board the chip is used on? Or trace some of the signals going to it, that would certainly help matching pin-outs. \$\endgroup\$ – Jeroen3 Oct 26 '17 at 8:10
  • \$\begingroup\$ Related: electronics.stackexchange.com/questions/334128/… \$\endgroup\$ – laptop2d Oct 29 '17 at 4:25
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The decoder

I searched ebay for "darlington dfn8" and found a "AON 7200" chip. A 30V N-Channel MOS-FET, where 4 pins of one side are internally connected. So I have to measure if it is this type. Tecnically it might be that...

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  • \$\begingroup\$ Draw circuit diagram basing on the board layout and component pinout and share it. People will be able to give you better idea then. \$\endgroup\$ – Anonymous Nov 2 '17 at 21:34

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