Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Be careful as the cathode may be connected to the tab...

Posted by Al Sekela (A) on December 31, 2006 at 13:52:48

In Reply to: Hex Fred diodes help..... posted by ABliss on December 31, 2006 at 11:12:47:

If your diodes look like the one in the link below, beware that the mounting tab is electrically connected to the cathode (-) side of the diode. Any heat sink attached to it will also be electrically connected unless you mount the diodes with insulating mica wafers. You can get TO-220 mounting kits that contain the mica washers and insulating sleeves for the mounting bolts from electronics supply houses.

Heat-sink mounting is a good idea, as HexFRED diodes do not have overload capacity like conventional diodes. The inrush current upon power-up may burn them out.

You can solder them with the skinny legs (with care), but the diode can then vibrate easily unless it is held down in some fashion.

• I-R datasheet (pdf) for HexFRED   (Open in New Window)

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