BYT56 Questions

  • Thread starter Watson A.Name - "Watt Sun
  • Start date
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Watson A.Name - "Watt Sun

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I got a couple BYT56 rectifier diodes from a SMPS, and I've got a
couple Qs.

The two diodes were in series on the PC bd but there were no high
voltage parts with them, just a SPMS with some 160V caps, etc.

I googled and found the data sheet at
http://www.vishay.com/diodes/list/product-86032/

Problem is that the ones I have are marked
BYT56 KTFK

with no A, B, etc, suffix. I would expect the KTFK to not be part of
the part number, maybe a date code, or mfgr. Google gives nothing
with the KTFK.

Then I found www.elektro-obecnice.cz/data/pdf/BY/BYT56.pdf which is
apparently the same data sheet as above, but with TEMIC as the name,
instead of Telefunken or Vishay. I'm not sure what the story is with
the different names or who bought out who, or when.

But the first data sheet calls them fast avalanche, the second data
sheet calls them fast mesa rectifiers. I can't remember seeing a
rectifier called avalanche. That's how a zener works.

Anyhow, I'm still looking around for more info, mainly what breakdown
voltage these might be. For the moment I'm assuming they're the
lowest one in the data sheet - probably a prudent decision..
Thanks.

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"Watson A.Name - Watt Sun" schrieb:

BYT56 KTFK
Click to expand...
Read it as BYT56K TFK (800V rating, made by Telefunken).


Then I found www.elektro-obecnice.cz/data/pdf/BY/BYT56.pdf which is
apparently the same data sheet as above, but with TEMIC as the name,
instead of Telefunken or Vishay. I'm not sure what the story is with
the different names or who bought out who, or when.
Click to expand...
Telefunken was bought by Daimler Benz and they changed the name to
TEMIC, later they sold the semiconductor section to Vishay.


But the first data sheet calls them fast avalanche, the second data
sheet calls them fast mesa rectifiers. I can't remember seeing a
rectifier called avalanche. That's how a zener works.
Click to expand...
You are right, BYT56 are mesa rectifiers.


Regards,
Dieter

Dieter
 
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"Watson A.Name - Watt Sun" wrote:
I got a couple BYT56 rectifier diodes from a SMPS, and I've got a
couple Qs.

The two diodes were in series on the PC bd but there were no high
voltage parts with them, just a SPMS with some 160V caps, etc.

I googled and found the data sheet at
http://www.vishay.com/diodes/list/product-86032/

Problem is that the ones I have are marked
BYT56 KTFK

with no A, B, etc, suffix. I would expect the KTFK to not be part of
the part number, maybe a date code, or mfgr. Google gives nothing
with the KTFK.

Then I found www.elektro-obecnice.cz/data/pdf/BY/BYT56.pdf which is
apparently the same data sheet as above, but with TEMIC as the name,
instead of Telefunken or Vishay. I'm not sure what the story is with
the different names or who bought out who, or when.
Click to expand...
Dieter explained that already. BYT56K is a fast Si rectifier diode in a
SOD-64 sintered glass package. Ratings: 800V, 3A, 100 ns. Fast reverse
recovery is needed to keep losses low in an SMPS.

But the first data sheet calls them fast avalanche, the second data
sheet calls them fast mesa rectifiers. I can't remember seeing a
rectifier called avalanche. That's how a zener works.
Click to expand...
There is no contradiction here. "Mesa" refers to sloped edges of a Si
chip produced by etching. Mesa geometry helps to obtain "controlled
avalanche" characteristics. This means that reverse breakdown occurs
evenly across the whole junction area.

In ordinary "non-avalanche" diodes, by contrast, reverse breakdown
concentrates in a single hot spot (because a local temperature rise
amplifies a local breakdown), and the junction gets punctured quickly.

Avalanche rectifiers may be operated in reverse breakdown for brief
times, the allowed duration depending on heat capacity and thermal
conduction as for forward operation. Controlled avalanche
characteristics are useful if you want an SMPS to withstand brief line
voltage transients.

Martin.


Anyhow, I'm still looking around for more info, mainly what breakdown
voltage these might be. For the moment I'm assuming they're the
lowest one in the data sheet - probably a prudent decision..
Thanks.
Click to expand...

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In article <3F605183.636CAE6@t-online.de>, Dieter.Wiedmann@t-online.de
mentioned...
"Watson A.Name - Watt Sun" schrieb:

BYT56 KTFK

Read it as BYT56K TFK (800V rating, made by Telefunken).
Click to expand...
Well, thank you. Now that you show me how to decipher it, it makes
sense. Now you've really made me start scratching my head, because
the two were in series and I didn't see any other high voltage
components around these two. And they're high current, so at 1600
volts total and 3 amps, this is some serious power! But why would
they need that kind of ratings in a cheap monitor, or any piece of
consumer electronics? Weird. If I get a chance, I'll look at the
board and see what's happening.

Then I found www.elektro-obecnice.cz/data/pdf/BY/BYT56.pdf which is
apparently the same data sheet as above, but with TEMIC as the name,
instead of Telefunken or Vishay. I'm not sure what the story is with
the different names or who bought out who, or when.

Telefunken was bought by Daimler Benz and they changed the name to
TEMIC, later they sold the semiconductor section to Vishay.
Click to expand...
I've heard of TEMIC, and what you've said is that they are no longer
called TEMIC, but just a division of Vishay. Cute. They're getting
as bad as AT&T/Lucent/Avaya..

But the first data sheet calls them fast avalanche, the second data
sheet calls them fast mesa rectifiers. I can't remember seeing a
rectifier called avalanche. That's how a zener works.

You are right, BYT56 are mesa rectifiers.
Click to expand...
Thanks.

Regards,
Dieter

Dieter
Click to expand...
--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
 
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