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Unknown electronic component

 
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harisA



Joined: 03 Jul 2011
Posts: 443
Location: Greece

PostPosted: Mon Dec 04, 2017 10:03 am    Post subject: Unknown electronic component Reply with quote

This came from an electronic device's motherboard. Hope someone can identifu it.

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Jacek



Joined: 02 Oct 2011
Posts: 4715
Location: Poland

PostPosted: Thu Dec 07, 2017 10:22 am    Post subject: Reply with quote

Very nice photo
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rjlittlefield
Site Admin


Joined: 01 Aug 2006
Posts: 18252
Location: Richland, Washington State, USA

PostPosted: Thu Dec 07, 2017 12:24 pm    Post subject: Reply with quote

That's a very interesting marking technique! Looks like a welding track, complete with discoloration. Some sort of electric arc process?

I do not recognize the component.

--Rik
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genera



Joined: 05 Oct 2011
Posts: 68
Location: California, USA

PostPosted: Thu Dec 07, 2017 3:01 pm    Post subject: Reply with quote

If it's off a PC motherboard it may be a crystal oscillator. Just a wild guess.

The weld around the perimeter was possibly done with a laser welder or a TIG welder in a vacuum or inert atmosphere. I say that because there's no heat discoloration. The ID markings were probably done with a laser welder but in a normal atmosphere resulting in oxidation from the heat.
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-Gene
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mawyatt



Joined: 22 Aug 2013
Posts: 985

PostPosted: Thu Dec 07, 2017 3:33 pm    Post subject: Reply with quote

Can you post a picture of the entire component? Doesn't have to be a "quality" shot though. This could help identify it. BTW 26.0 is not a standard number you see on non-accurate components like typical resistors and capacitors which use 22 and 27.
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harisA



Joined: 03 Jul 2011
Posts: 443
Location: Greece

PostPosted: Fri Dec 08, 2017 7:36 am    Post subject: Reply with quote

Here is some additional information. Initial photo was taken with 10x objective so approx.. dimensions of the component are 1.9mmx2.5mm.

This came from mobile phone motherboard. Here are some 5x images.

1)Bright field




2)Bright field with cross polarizers (focus on board plane reveals 4 wire connections)





3)Dark field


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mawyatt



Joined: 22 Aug 2013
Posts: 985

PostPosted: Fri Dec 08, 2017 1:05 pm    Post subject: Reply with quote

Looks like a crystal oscillator to me, probably 26.0 MHz.
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Smokedaddy



Joined: 07 Oct 2006
Posts: 800
Location: Phoenix, Arizona

PostPosted: Fri Dec 08, 2017 5:21 pm    Post subject: Reply with quote

Interesting.
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mawyatt



Joined: 22 Aug 2013
Posts: 985

PostPosted: Sat Dec 09, 2017 8:09 am    Post subject: Reply with quote

Note that apparently only 3 electrical connections are used, the lower right "pad" doesn't seem to be connected. This would follow a simple oscillator, since only +Vcc, Ground and the output are needed.
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