Re: MUR1660 Question.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Zagarus Rashkae <arbitrarily_random-at-yahoo-dot-com> 


--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: Robynsaddiction-at-aol-dot-com
 >
 > Hello,
 >
 >         I am building a half bridge, and am ready to
 > install that MUR1660
 > diodes. However, I have a question about
 > installation. The case is TO-220;
 > pin 1 & 3 are anodes, while pin 2 is the cathode.
 > Anyhow, I am just
 > wondering how the middle pin can just be neglected.
 > For instance, in my
 > Plasma Sonic board the only legs of the case that
 > are soldered to the board
 > are the two anodes. The (K) cathode was clipped. Did
 > I get the wrong diodes
 > or what? -Richard
 >
 >


No, this is normal and the cathode is the tab of the
TO-220. It should be attached to the board with a
screw, since the pad on the board is the cathode
contact. Also, there should be a small heatsink on the device.