BY500-800 diode vs 1N4007?

9/12/2005 4:35:04 PMspecops56

Is anyone familiar with this diode:

Part: BY500-800
Description: 800 V, 5 A, Soft Recovery Fast Switching Plastic Rectifier

How does it compare with the 1N4007 as a replacement for a selenium rectifier?

Terry

9/12/2005 4:53:08 PMNorm Leal

Hi Terry

A 1N4007 is rated 100 v @ 1 amp.

Selenium rectifiers are usually rated to 380 PIV at currents from 50 ma to 750 ma for some TV's.

Either type diode will be ok to replace a selenium rectifier. You should add some series resistance to reduce surge current and drop a few volts. A silicon diode has a voltage drop around .7 volts. Selenium rectifier 7-9 volts.

Norm

:Is anyone familiar with this diode:
:
:Part: BY500-800
:Description: 800 V, 5 A, Soft Recovery Fast Switching Plastic Rectifier
:
:How does it compare with the 1N4007 as a replacement for a selenium rectifier?
:
:Terry

9/12/2005 5:09:30 PMNorm Leal

Oops left off a zero A 1N007 is rated 1000 PIV @ 1 amp.

Norm

:Hi Terry
:
: A 1N4007 is rated 100 v @ 1 amp.
:
: Selenium rectifiers are usually rated to 380 PIV at currents from 50 ma to 750 ma for some TV's.
:
: Either type diode will be ok to replace a selenium rectifier. You should add some series resistance to reduce surge current and drop a few volts. A silicon diode has a voltage drop around .7 volts. Selenium rectifier 7-9 volts.
:
:Norm
:
::Is anyone familiar with this diode:
::
::Part: BY500-800
::Description: 800 V, 5 A, Soft Recovery Fast Switching Plastic Rectifier
::
::How does it compare with the 1N4007 as a replacement for a selenium rectifier?
::
::Terry

9/13/2005 12:05:35 AMspecops56

:Thanks Norm! I happened to run across a European site where the guy had used it to replace the selenium on the same radio,(Zenith A835) that I'm working on. I just wondered if there was any advantage to using it. Reckon I'll use the 1N4007 since I have a bunch of those.

Terry

9/13/2005 12:51:54 AMRich, W3HWJ

::Thanks Norm! I happened to run across a European site where the guy had used it to replace the selenium on the same radio,(Zenith A835) that I'm working on. I just wondered if there was any advantage to using it. Reckon I'll use the 1N4007 since I have a bunch of those.
:
:Terry

As Norm says, the BY part should work fine, but it is a needless expense. The BY is a fast recovery device intended for switch-mode power supplies operating above 20 KHz. If you have 1N4007s... use 'em. Don't pay 5x more for something you don't need. Rich