Electronics > Repair

Unusual diode package

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ebastler:
I am repairing a 1980s linear power supply (FG Elektronik NMC 8006, used in a small-series German computer). One of the diodes in the 5V rectifier has become conductive.

The diode comes in a package I have not seen before -- see the attached photo: The body is a flat disk, 10 mm diameter, 4.5 mm tall. The terminals are flat and circular too, a tad less than 6 mm diameter. There is no lettering on the package, just a red color code for the anode side, and "10 A diodes" silkscreened on the PCB.

FG Elektronik have done a nice job mounting these diodes, with good heat transfer both to the PCB and to a mounting/connecting tab on the opposite side. Two diodes share one connecting tab -- one of these is also shown in the photo. Hence I would like to replace the diode with one in the same package.

I have scrolled through many catalog pages of diodes at Mouser but can't find this type of package. Any hints how it might be called? Thank you!

T3sl4co1l:
Possibly some of these?
https://www.digikey.com/en/products/filter/diodes-rectifiers-single/press-fit/280?s=N4IgjCBcpgbFoDGUBmBDANgZwKYBoQA3AOygBcAnAV3xAHsoBtEAFlgGYWBOdkAXQIAHMlBABlSgEtiAcxABfRUA

You might have to search far and wide for an exact equivalent, or NOS originals.  Also, depending on which side of Germany that was, consider ex/Soviet sources?

If nothing else you could keep the block and stuff an SMT schottky underneath, almost no one's the wiser?  (Schottky just for the poorer on-board heat dissipation, save a bit of temp rise.)

Tim

mzacharias:
Looks more like a button cell battery to me.

wasedadoc:

--- Quote from: mzacharias on March 23, 2023, 01:37:19 pm ---Looks more like a button cell battery to me.

--- End quote ---
There is a saying "Looks can be deceiving".  Applicable to you in this case.   :)

They are rectifiers.  I have some of that package type.

simba15:
I was able to find a few examples with the keyword "Press-pack Diode".

Seems to be available from the typical rectifier manufactures IXYS, Infineon Little fuse etc. but it seems they are mostly larger than your example.

Hope you can find a suitable one.

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