RE: Good IGBT List?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Alan Majernick" <rainylake@xxxxxxx>

Hi Everyone:

Just a note. I sell to lots of subscribers of the list. Thanks for your
business.  I have never used the list as an advertising tool because I don't
feel it's in the best interest of anyone (plus I'm sure Terry would censor
me anyway, just kidding) The items I sell on my eBay site "TeslaStuff"
http://stores.ebay.com/TeslaStuff are all top quality. My 942 caps are just
as Dr. R says, they come direct from CDE but are made by their Asian
manufacturer to their specs, CDE sells no other 942 caps (I called them).
I'm sure there are cheap seconds out there, but they are not mine. I have
never had a negative feedback from a buyer, and it's going to stay that way.

Alan

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Monday, November 06, 2006 8:56 PM
To: tesla@xxxxxxxxxx
Subject: Re: Good IGBT List?

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Some semiconductor magazines will have articles regarding parts (good
parts vs. the cheap parts). It wasn't too long ago that I read an
article on a part where the manufacturer explicitly explained and
showed (with pictures) the difference between a good manufacturer
part and a cheap replica. It looks identical on the outside, but the
internal dies were like 70% smaller). I couldn't believe how poorly
the replica was made.

The familiar line "parts are parts" is not true in electronics. I
guess the term (equivalent or replica) means that it looks like the
original on the outside (but that's about it). I'm sure there are
true equivalents, but it may be worth an optopsy to be sure.

Take care,
Bart

Tesla list wrote:

>Original poster: "resonance" <resonance@xxxxxxxxxxxx>
>
>Another mistake experimenters make, in being economically frugal, it
>to buy their semiconductors off E-Bay or from a surplus house.  Many
>of these are factory "seconds" that do not meet the normal
>manufacturer's standards. Sometimes it's only cosmetic, but other
>times it has flaws which will cause electrical failure.
>
>I've seen people degrade manufacturers for bad products when they
>have purchased "seconds" that failed.
>
>Also, most Tesla experimenters are operating the IGBTs at or above
>their rated values.  This also can cause premature failure of the
>semiconductor.
>
>If you are on a tight budget you must be willing to accept
>occassional failures.
>
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>Dr. Resonance
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>>I would have to agree with Steve here. The only way you get to
>>reduce the number of failed semi's is through a better
>>understanding of how they work. Search the manufacturer's websites
>>for application notes, and detailed datasheets.
>>
>>Having blown up many single IGBT modules worth upwards of $2000
>>each in my research, I have learned the hard way that the
>>manufacturers do not necessarily know everything either however.
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