Diode identification?

D

DaveC

Guest
From Japanese SMPS, looks like regular 1A rectifier diode. Labeled B320219
(the "02" is larger type than the others).

Can't find cross-reference. Any help would be greatly appreciated.

Thanks,
--
DaveC
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DaveC wrote:
From Japanese SMPS, looks like regular 1A rectifier diode. Labeled B320219
(the "02" is larger type than the others).

Can't find cross-reference. Any help would be greatly appreciated.

Any chance of reverse-engineering the bit of the circuit it is used in,
Click to expand...
and producing a bit of a circuit diagram?

--
Sue
 
Palindr?me wrote:

DaveC wrote:
From Japanese SMPS, looks like regular 1A rectifier diode. Labeled B320219
(the "02" is larger type than the others).

Can't find cross-reference. Any help would be greatly appreciated.

Any chance of reverse-engineering the bit of the circuit it is used in,
and producing a bit of a circuit diagram?
Click to expand...
It's probably not too tricky to acertain it's likely rating and speed by
judicious examination of where it lies in the gubbins.

Graham
 
Thus spake Palindr☝me:

Any chance of reverse-engineering the bit of the circuit it is used in, and
producing a bit of a circuit diagram?
Click to expand...
Not very good at this... just a component-test monkey (c:

But it (and its partner) seems to be across a c.t. winding of the SMPS
transformer. Electrolytic filter caps "downstream" from these are rated at
25v.

There are a dozen more of this type of diode in this SMPS, across other
trans. windings.

This is a multiple-voltage ps inside a 240v ac motor controller in a Japanese
printing press.

Thanks,
--
DaveC
me@privacy.net
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"DaveC" <me@privacy.net> wrote in message
news:0001HW.C08779B30007055EF02845B0@news.readfreenews.net...
Thus spake Palindrâ~ťme:

Any chance of reverse-engineering the bit of the circuit it is used in,
and
producing a bit of a circuit diagram?

Not very good at this... just a component-test monkey (c:

But it (and its partner) seems to be across a c.t. winding of the SMPS
transformer. Electrolytic filter caps "downstream" from these are rated at
25v.

There are a dozen more of this type of diode in this SMPS, across other
trans. windings.

This is a multiple-voltage ps inside a 240v ac motor controller in a
Japanese
printing press.

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group

If it's on the secondary side, it will not be a 'normal' 1A diode. It will
Click to expand...
be a high speed Schottky type. If you try to use a standard silicon
rectifier diode, it will run very hot and fail, in short order.

Arfa
 
"DaveC" <me@privacy.net> wrote in message
news:0001HW.C0876DCF00043BFAF02845B0@news.readfreenews.net...
From Japanese SMPS, looks like regular 1A rectifier diode. Labeled B320219
(the "02" is larger type than the others).

Can't find cross-reference. Any help would be greatly appreciated.

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
Click to expand...
If testing it shows slight reverse leakage - it could be a Shottky-barrier
type, Most DMMs have a diode forward voltage test if the Vf is less than
about 0.4V and more than 0.1V it almost certainly is SB, if its glass
encapsulated - consider the possibility it's a zener, these show Vf about
0.7V, regular diodes show about 0.6V and fast silicon types usually
somewhere around 0.55V.

But if any of these tests pass - it's probably OK anyway!
 
Thus spake ian field:

If testing it shows slight reverse leakage - it could be a Shottky-barrier
type, Most DMMs have a diode forward voltage test if the Vf is less than
about 0.4V and more than 0.1V it almost certainly is SB, if its glass
encapsulated - consider the possibility it's a zener, these show Vf about
0.7V, regular diodes show about 0.6V and fast silicon types usually somewhere

around 0.55V.
Click to expand...
The other diode ("good" one) in the circuit measures 0.4v in DMM diode test
(Fluke meter). Not glass, epoxy (black stuff).

But if any of these tests pass - it's probably OK anyway!
Click to expand...
Infinite both directions, according to diode test on the DMM.

Is SB type used as rectifier in SMPS? Or is vanilla Schottky used in this
application?

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
 
"DaveC" <me@privacy.net> wrote in message
news:0001HW.C08780B00008A890F02845B0@news.readfreenews.net...
Thus spake ian field:

If testing it shows slight reverse leakage - it could be a
Shottky-barrier
type, Most DMMs have a diode forward voltage test if the Vf is less than
about 0.4V and more than 0.1V it almost certainly is SB, if its glass
encapsulated - consider the possibility it's a zener, these show Vf about
0.7V, regular diodes show about 0.6V and fast silicon types usually
somewhere

around 0.55V.

The other diode ("good" one) in the circuit measures 0.4v in DMM diode
test
(Fluke meter). Not glass, epoxy (black stuff).

But if any of these tests pass - it's probably OK anyway!

Infinite both directions, according to diode test on the DMM.

Is SB type used as rectifier in SMPS? Or is vanilla Schottky used in this
application?

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
Click to expand...
Is "the other one" with 0.4Vf identical to the one you've taken out?
 
Thus spake ian field:

Is "the other one" with 0.4Vf identical to the one you've taken out?
Click to expand...
Yes, same markings. They're apparently a backward-connected set of rectifiers
across a SMPS ct transformer secondary.

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
 
DaveC wrote:

Thus spake Palindr☝me:

Any chance of reverse-engineering the bit of the circuit it is used in, and
producing a bit of a circuit diagram?

Not very good at this... just a component-test monkey (c:

But it (and its partner) seems to be across a c.t. winding of the SMPS
transformer. Electrolytic filter caps "downstream" from these are rated at
25v.
Click to expand...
You mean the anode ( or cathode ) of the diode is directly connected to a
reservoir cap ? It'll be a rectifier on the secondary side. It needs to be a high
speed type and from your mention of 25V, I'd probably use a 200V part ( for
safety's sake ). Current rating - you say it looks like 1A - would suggest a
UF4003 replacement. Are you sure about the current rating though ?
http://www.chipdocs.com/datasheets/datasheet-pdf/MCC/UF4001.html

Graham
 
Arfa Daily wrote:

"DaveC" <me@privacy.net> wrote in message
news:0001HW.C08779B30007055EF02845B0@news.readfreenews.net...
Thus spake Palindrâ~ťme:

Any chance of reverse-engineering the bit of the circuit it is used in,
and
producing a bit of a circuit diagram?

Not very good at this... just a component-test monkey (c:

But it (and its partner) seems to be across a c.t. winding of the SMPS
transformer. Electrolytic filter caps "downstream" from these are rated at
25v.

There are a dozen more of this type of diode in this SMPS, across other
trans. windings.

This is a multiple-voltage ps inside a 240v ac motor controller in a
Japanese
printing press.

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group

If it's on the secondary side, it will not be a 'normal' 1A diode. It will
be a high speed Schottky type.
Click to expand...
Not necessarily Shottky actually. ( btw - is it *meant* to have a 'c' in it or
not ? )

If you try to use a standard silicon
rectifier diode, it will run very hot and fail, in short order.
Click to expand...
Oh I don't know. A subcontractor once fitted a 1N4004 where I'd specified a
UF4004 on a lightly loaded secondary. It ran for many hours before failing !

They did it second time round too ! I reckon that purchasing looked at the part
number and reckoned they could substitute. Lovely stuff working with Asians.

Funny thing was, my colleagues looked glum since it was our first smps design. I
( in my infinite wisdom ! ) smelt a rat and went to it almost straight off. It
was shorted. Just made the thing go into hiccup mode.

Graham
 
Thus spake Pooh Bear:

http://www.chipdocs.com/datasheets/datasheet-pdf/MCC/UF4001.html
Click to expand...
(That's a paid-subscription link...)

Re. the current rating, I'm just comparing the unit in question with a
non-schottky, vanilla 1A rectifier. They are similar in size.

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
 
DaveC wrote:

Thus spake ian field:

If testing it shows slight reverse leakage - it could be a Shottky-barrier
type, Most DMMs have a diode forward voltage test if the Vf is less than
about 0.4V and more than 0.1V it almost certainly is SB, if its glass
encapsulated - consider the possibility it's a zener, these show Vf about
0.7V, regular diodes show about 0.6V and fast silicon types usually somewhere

around 0.55V.

The other diode ("good" one) in the circuit measures 0.4v in DMM diode test
(Fluke meter). Not glass, epoxy (black stuff).

But if any of these tests pass - it's probably OK anyway!

Infinite both directions, according to diode test on the DMM.

Is SB type used as rectifier in SMPS? Or is vanilla Schottky used in this
application?
Click to expand...
SB = Shottky barrier. Techy speak for 'shottky'.

Graham
 
DaveC wrote:

Thus spake Pooh Bear:

http://www.chipdocs.com/datasheets/datasheet-pdf/MCC/UF4001.html

(That's a paid-subscription link...)
Click to expand...
Yabbut.... It gave a list of UF400x devices which I didn't find anywhere else
quickly. You can get the data easily with a bit of common sense. Oh sod it.....
http://www.fairchildsemi.com/pf/UF/UF4003.html get the pdf

Re. the current rating, I'm just comparing the unit in question with a
non-schottky, vanilla 1A rectifier. They are similar in size.
Click to expand...
I ask for a reason. Do you know the current draw on the supply ? It pays to fit
a beefier device if unsure.

Graham
 
DaveC wrote:
Thus spake Pooh Bear:


http://www.chipdocs.com/datasheets/datasheet-pdf/MCC/UF4001.html


(That's a paid-subscription link...)

Re. the current rating, I'm just comparing the unit in question with a
non-schottky, vanilla 1A rectifier. They are similar in size.

The thickness of the wires coming out is often a better indication than
Click to expand...
the size of the body.

IIUC, you aren't going into production with this thing, just trying to
get it working. So you can afford to err on the side of safety and put
in a well over-spec'ed schottky, even though a much lower spec'ed (i.e.
lot cheaper) device would be fine too.

Any idea why it failed?

--
Sue
 
Thus spake Palindr☝me:

Any idea why it failed?
Click to expand...
Nope. There are 4 identical controllers. They've all been purring along for
near 10 years without a hiccup.
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
 
Thus spake Pooh Bear:

SB = Shottky barrier. Techy speak for 'shottky'.
Click to expand...
Not to get too bogged down in terminology, but
sb = schottky barrier = schottky ?

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
 
Thus spake Pooh Bear:

I ask for a reason. Do you know the current draw on the supply ? It pays to
fit a beefier device if unsure.
Click to expand...
Like this?:
http://www.nteinc.com/specs/500to599/pdf/nte580.pdf

I need it today and nte is the only maker available locally over-the-counter.


Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group
 
DaveC wrote:

Thus spake Palindr☝me:

Any idea why it failed?

Nope. There are 4 identical controllers. They've all been purring along for
near 10 years without a hiccup.
Click to expand...
Stuff gives up after a while sometimes !

Graham
 
DaveC wrote:

Thus spake Pooh Bear:

SB = Shottky barrier. Techy speak for 'shottky'.

Not to get too bogged down in terminology, but
sb = schottky barrier = schottky ?
Click to expand...
Yes. The barrier bit is optional if you like. It's about the junction inside the
device. Like pn junctions. Except this one is a barrier. If one cares to be
verbose, ordinary silicon diodes could be called junction diodes.

Graham
 
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