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Unknown Surface Mount Device

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CapnCavey

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:mrgreen: I have a small circular surface mount device with four pins connected to the four sides, north, south, east and west, as seen in the picture below. The device appears to be a FET and the only markings I see are E5 written on the top. It is part of an amplifier circuit but I don't think it is a transistor, since the board location is listed with a U instead of a Q. I've been trying for days to find the part number, with no success. I know it's not alot of information to go on, but if anyone can help me, it would be most appreciated.
 

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Exo

Active Member
You might give the SMD codebook a try
http://www.marsport.demon.co.uk/smd/mainframe.htm

but every manufacturer pick's his own markings, so there could be dozens of E5 devices out there, all diffirent...

The only way to be sure is to get a scematic or at least know the manufacturer or its like looking for a needle in a haystack
 

CapnCavey

New Member
I've tried several codebooks allready. Unfortunately, I don't have any schematics and won't be able to get any. The part is used in the final amplification stage of an RF card belonging to a Terayon Teralink 1000 Proprietary Modem Controller. When the part fails, I still get an output, albeit a at a much lower level than I need.
 

CapnCavey

New Member
Thanks guys, I've found the MAR series, it's made by Mini-Circuits. I'm ordering a few samples of the MSA, MAR and the ERA series, also by Mini-Circuits, and see which one matches my part the closest. :D
 
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