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Old 28th December 2005, 03:48 PM   #1
Netlist is offline Netlist  Belgium
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Default Unknown SMD

I found this broken SMD in a plotter board, in the regulator stage.
One side carries 40VDC, the other is connected to ground.
Rectifier->fuse->SMD->ground.
The fuse is broken as I measure a short across both leads of the device.
If you look carefully, you see a sign of a half sine wave and the letters M R. R might be B

As usual, any help is appreciated.

/Hugo
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Old 29th December 2005, 03:26 PM   #2
Onra is offline Onra  Germany
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Hi,
it,s a SEMITRON device (now Littlefuse).
The marking code can be found at:
http://clivetec.superihost.com/SMD_CodesM.htm
and should be a SMB40 unidirectional transient suppressor with a voltage limit of 40V.

Onra
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Old 29th December 2005, 05:58 PM   #3
Netlist is offline Netlist  Belgium
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Onra,
thank you very much. Page bookmarked.

/Hugo
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Old 30th December 2005, 01:02 PM   #4
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These devices failsafe shorted
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