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28th December 2005, 02:48 PM
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#1 |
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diyAudio Moderator Emeritus
Join Date: Jan 2003
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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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29th December 2005, 02:26 PM
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#2 |
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diyAudio Member
Join Date: Jul 2005
Location: near Frankfurt/M
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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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