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Failed component

This part may be damaged (outwardly it’s intact). It comes from a proprietary video card from 18+ years ago I’m trying to fix (finding another card has been a challenge).

This component currently only has a diode connection between one of the leg pair and the third leg. I think the other combinations are open circuit.

The part appears to sit between two different voltage rails (on the leg pair). I assume it uses a lower voltage (5 V) to signal a 12 V part or enable line.

The marking seems fairly clear but unless I’m reading to backwards or something I cannot find any SMD book, online search, or catalog with this marking.

To me it starts with “N” and appears to have a small case “o” & “s”. With a data code going sideways.

I’ve seen biased transistors on something like N05 with this marking layout. But outside the layout the actual letters don’t correspond to any data sheet I can find.

I’m hoping this component gets me closer to fixing my item.

Null
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Josh
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  • "The part appears to sit between two different voltage rails (on the leg pair). I assume it uses a lower voltage (5 V) to signal a 12 V part or enable line." - is it connected directly to the rails? Or to signals that are derived from those rails? Or through a resistor? etc? – nanofarad Nov 05 '21 at 15:22
  • This part has been suggested to be a Vishay TN0200T N-channel MOSFET. However the markings still aren’t quite right to me. I’m going to try to test that assumption. I tracked this component using only ohms down the 5v and 12v rails. While the specs claim it’s suppose to be pulsed in operation, I didn’t see an obvious pulse-sending mechanism (hence unsure if it’s a mosfet). This area has lots of 1K and some 2K resistor arrays, so yes, a lot of the current is limited through very small resistor arrays for these components. – Josh Nov 05 '21 at 18:22
  • A measurable diode connection and possible base resistors around could suggest a BJT (potentially with a damaged collector if this part only reads one diode drop and open ckt on the third pin), but I am not certain by any means. – nanofarad Nov 05 '21 at 18:54
  • We’ll whatever it is, it’s likely some form of mosfet as I can switch it in and off, I don’t think it’s biased as I don’t see kilohms of resistance anywhere. Since it works I’m placing it back, darn, I thought I was into something. – Josh Nov 05 '21 at 19:58

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