I have a Seagate ST3120026A, 120GB, F8.01. One of the components is burnt. I am looking to replace it if I can identify it. Can anyone identify the component circled in the attached image, and let me know size/rating etc..

thanks,

Its a TVS, simply remove it.
If you want more info, search this forum for TVS.
Hope nothing else is damaged.

Best regards,

Dobre

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Whats the black colored component between the yellow circle and the screw at top right of PCB?

Cheers

-Al

Here's a better photo:
http://longdata.ru/images/Seagate/ST3120026A_PCB.jpg

The component you are referring to is a 12V, 600W, unidirectional TVS diode, marking code BUX, made by ST Microelectronics.

The BU? marking code appears to be used by ST Microelectronics in their SMBJ series 600W Transil (TVS) range. The "C" appears to be the manufacturing location, followed by a numeric YWW date code.

Here is the datasheet:
http://www.st.com/stonline/products/lit ... s/5616.pdf

The component circled in yellow is a 5V, 400W, unidirectional TVS diode, marking code QE, made by ON Semiconductor. Its part number is 1SMA5.0AT3.

Here is the datasheet:
http://www.datasheetarchive.com/pdf-dat ... DSA-4543...

ON TVS/Zener Device Data Book:
http://www.mosaico-eng.com.br/arquivos/ ... 0Zener.pdf

If, for continued protection, you want to replace the diode, try Farnell or RS Components.

Look for the SMBJ series (600W) or SMAJ (400W).

I have this disk ST3120026A , still need help ?

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Please (free) help :
http://rzr.online.fr/q/hdd#
how to unlock/format ST3120026A in max security ?
"ALPINE - 1_Disk M.14 01-16-03 11:51"

HI.... i found a Seagate ST340015A with same trouble; but the burned component is located near the motor. This hard drive was producing a short circuit in the power supply.
Reading this forum i found that this component is a diode ... then i proceed to desolder it. Now the drive works perfectly. Thank you very much.

Thank you for the advice
I cant find that TVS´s in my city but ... then i found a equivalent VDR ... very similar ... just having a slower response speed.
Hopefully serve.

I have this drive too

viewtopic.php?f=1&t=14545&p=201380&hilit=ST3120026A#p201380

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--
Please (free) help :
http://rzr.online.fr/q/hdd#
how to unlock/format ST3120026A in max security ?
"ALPINE - 1_Disk M.14 01-16-03 11:51"