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1KV Schottky Rectifiers

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Posted on February 27, 2015 at 12:42:23
Triode_Kingdom
Audiophile

Posts: 10037
Location: Central Texas
Joined: September 24, 2006
 Anyone have any experience with the Cree rectifiers at the link below? I think it would be pretty easy to cut a small PCB for these. I just don't know how reliable they are.

EDIT: The link is Vishay, not Cree. Sorry for the confusion. I was looking at Cree at the same time.


 

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RE: 1KV Schottky Rectifiers, posted on February 27, 2015 at 13:08:30
Maxamillion
Audiophile

Posts: 856
Location: New Jersey
Joined: May 26, 2006
 No experience with those surface mount diodes but I've used these 1200V TO-220 Cree Schottky diodes in my 833C amp to rectify the 2.5kV supply. 5 in series on each leg with a cap across each has worked like a charm for more than a year now.




 

Ditto for the 1200V part,..., posted on February 27, 2015 at 13:28:29
Lew
Audiophile

Posts: 10911
Location: Bethesda, Maryland
Joined: December 11, 2000
 in both of my monoblock amplifiers, where B+ = 400V.

 

Wow! $0.15 each in 1,000 quantity, posted on February 27, 2015 at 13:42:37
Chip647
Audiophile

Posts: 2645
Location: The South
Joined: December 24, 2012
 A lifetime supply of 1Kv Schottkys for $150.

I have never had a failure with their through-hole parts.

 

RE: 1KV Schottky Rectifiers, posted on February 27, 2015 at 14:29:00
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
 Surface mount parts are tricky and even tho the price is tempting,go the other route of the conventional leaded parts.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

Schottky Rectifiers in series, posted on February 27, 2015 at 17:05:15
RayP
Audiophile

Posts: 727
Location: Maryland
Joined: June 30, 2005
 Past posts suggested that Schottkys in series was not recommended but I see you are using cap bypasses. What value are you using?

ray

 

RE: Schottky Rectifiers in series, posted on February 27, 2015 at 21:43:37
JKT
Audiophile

Posts: 612
Location: Midwest
Joined: November 26, 2002
 I have series connected pairs of 1200PIV HEXFREDs in a hybrid bridge. I use 4.7M high voltage flame proof resistors across the diodes to equalize the voltage across them. Each pair is has a .01uF 1600V polypropylene across it. The equalizing resistors work. Haven't had a failure since replacing single rectifiers with series connected pairs.


"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln

 

It's not really a Schottky., posted on February 27, 2015 at 21:46:58
Paul Joppa
Industry Professional

Posts: 7295
Location: Seattle, WA
Joined: April 23, 2001
 Mouser has a lot of errors in their database, and this is obviously one of them. The specs are the same as the 1N400x series of leaded silicon diodes. Download the data sheet and search for the word schottky - it's not there anywhere.

BTW this came up a few months ago, IIRC.

 

You're right, they're not Schottky :(, posted on February 27, 2015 at 22:58:35
Triode_Kingdom
Audiophile

Posts: 10037
Location: Central Texas
Joined: September 24, 2006
 Are these the same diodes we discussed some time back? I remember the thread, but I thought they were something else. Anyway, I went to the Vishay site, and these are listed in the "Fast Recovery" category, not as Schottky. Like you say, it's a Mouser error. Guess I need to keep looking...


 

RE: 1KV Schottky Rectifiers, posted on February 27, 2015 at 23:39:19
xaudiomanx
Audiophile

Posts: 3647
Joined: August 16, 2004
 I understand the need for the five in series for each leg of the bridge but why the caps?

 

RE: 1KV Schottky Rectifiers, posted on February 28, 2015 at 09:17:10
Maxamillion
Audiophile

Posts: 856
Location: New Jersey
Joined: May 26, 2006
 The caps help equalize the voltage across the stack, and also help to snub resonant spikes and shunt noise. I use .01uF, 1600V film caps.

Recommended by the Valve Wizard, see link.

 

RE: Schottky Rectifiers in series, posted on February 28, 2015 at 09:28:30
Maxamillion
Audiophile

Posts: 856
Location: New Jersey
Joined: May 26, 2006
 .01uF caps. Haven't had any issues in over one year of heavy use.

 

Amazing. Here's my humble offering (picture), posted on March 1, 2015 at 07:09:06
PeterI
Audiophile

Posts: 1432
Location: Colorado
Joined: October 17, 2006



Cree schottky diode bridge for monoblock amplifiers (I made two).

Pete

 

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