Diode Dilemma!

Guest
Here's a question that bears some thought. The common 1N400x family of
diodes is available in a wide range of breakdown voltages, and, in most
catalogs, they are all close to, or the same price! Yup, the 200 PIV
unit and the 1KV part are both about the same price. Now, besides the
PIV, what's the difference? The factory specs show all the 1N400x
diodes on the same sheet, all the specs are the same except for the PIV
rating.

So the dilemma...Forget about batch testing, and sorting at the
factory. This is about us! Why would you use the lower PIV diode if
the higher rated unit, with a wider safety margin, is available at the
same cost?
Is there some black magic that after 40+ years in this business I have
yet to learn?

Any takers......
 
In article <1124089006.105475.211820@g14g2000cwa.googlegroups.com>,
lenp@electdiv.com wrote:

Here's a question that bears some thought. The common 1N400x family of
diodes is available in a wide range of breakdown voltages, and, in most
catalogs, they are all close to, or the same price! Yup, the 200 PIV
unit and the 1KV part are both about the same price. Now, besides the
PIV, what's the difference? The factory specs show all the 1N400x
diodes on the same sheet, all the specs are the same except for the PIV
rating.

So the dilemma...Forget about batch testing, and sorting at the
factory. This is about us! Why would you use the lower PIV diode if
the higher rated unit, with a wider safety margin, is available at the
same cost?
Is there some black magic that after 40+ years in this business I have
yet to learn?

Any takers......
Click to expand...
Dunno, but I DO know that when I've had 1N400X diodes to replace, the
replacements that get put in are, more often than not, 1N4007s, unless
the original was "bigger".

So I guess that means I tend toward the "same price? Overkill it, baby!"
end of the spectrum.

--
Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004.
Short form: I'm trashing EVERY E-mail that doesn't contain a password in the
subject unless it comes from a "whitelisted" (pre-approved by me) address.
See <http://www.sonic.net/~dakidd/main/contact.html> for full details.
 
On 14 Aug 2005 23:56:46 -0700, the renowned lenp@electdiv.com wrote:

Here's a question that bears some thought. The common 1N400x family of
diodes is available in a wide range of breakdown voltages, and, in most
catalogs, they are all close to, or the same price! Yup, the 200 PIV
unit and the 1KV part are both about the same price. Now, besides the
PIV, what's the difference? The factory specs show all the 1N400x
diodes on the same sheet, all the specs are the same except for the PIV
rating.

So the dilemma...Forget about batch testing, and sorting at the
factory. This is about us! Why would you use the lower PIV diode if
the higher rated unit, with a wider safety margin, is available at the
same cost?
Is there some black magic that after 40+ years in this business I have
yet to learn?
Click to expand...
According to old Motorola data, there appear to be two dies. One for
1N4001-4005 and another for 1N4006-7. The recovery times are much
slower (and the junction capacitance less) for the higher voltage die.

Probably not much difference between the two unless you're doing
something like a high-audio-frequency C-W voltage multiplier.

There also is a tiny difference in price, and it continues up into the
zillion unit price with generic rectifiers. I tend to use the 1N4005
for everything low voltage (not mains voltage or above).

Any takers......
Click to expand...

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
Where can I get the specs for the 1N4003. I have 50 of them I'd like
to sell, but am unsure of the specs.

Ken WB6QWF
ohio microwave dottttt commmmm

On 14 Aug 2005 23:56:46 -0700, lenp@electdiv.com wrote:

Here's a question that bears some thought. The common 1N400x family of
diodes is available in a wide range of breakdown voltages, and, in most
catalogs, they are all close to, or the same price! Yup, the 200 PIV
unit and the 1KV part are both about the same price. Now, besides the
PIV, what's the difference? The factory specs show all the 1N400x
diodes on the same sheet, all the specs are the same except for the PIV
rating.

So the dilemma...Forget about batch testing, and sorting at the
factory. This is about us! Why would you use the lower PIV diode if
the higher rated unit, with a wider safety margin, is available at the
same cost?
Is there some black magic that after 40+ years in this business I have
yet to learn?

Any takers......
Click to expand...
 
In article <9nr3g19eh005tm82a66b323d30c4mcl5b3@4ax.com>,
kenspam@notmyisp.com wrote:

Where can I get the specs for the 1N4003. I have 50 of them I'd like
to sell, but am unsure of the specs.
Click to expand...
If you get more than about a buck and a half for *ALL* of them, I'll be
surprised. Postage to ship them to the buyer is likely to be multiples
of the sale price. As in "You're wasting your time".

As for specs for 'em, googling on 1N4003 will give you as many hits for
them as you care to read through. Betcha one of the first 5 is to a
datasheet that covers the whole 1N400X series.

--
Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004.
Short form: I'm trashing EVERY E-mail that doesn't contain a password in the
subject unless it comes from a "whitelisted" (pre-approved by me) address.
See <http://www.sonic.net/~dakidd/main/contact.html> for full details.
 
On Tue, 16 Aug 2005 13:50:17 GMT, the renowned kenspam@notmyisp.com
wrote:

Where can I get the specs for the 1N4003. I have 50 of them I'd like
to sell, but am unsure of the specs.
Click to expand...
Google on the part number, first hit gives you a PDF datasheet.

But they're hardly worth selling. You'll probably do better looking
for loose change on the sidewalk.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
kenspam@notmyisp.com wrote:
Where can I get the specs for the 1N4003. I have 50 of them I'd like
to sell, but am unsure of the specs.

Ken WB6QWF
ohio microwave dottttt commmmm
Click to expand...

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=pdf+datasheet+1N4003&btnG=Google+Search
has links to datasheets from a number of manufacturers, but they are
common 2000 PIV 1A rectifiers.


Now, I have a question for you. I have a tray of 10 NOS Magnum
Microwave MH22T oscillator modules that were used in the Microdyne
1100-LPR C-Band Sat TV receivers, and I have been looking for the specs.

--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida
 
"Michael A. Terrell" wrote:
kenspam@notmyisp.com wrote:

Where can I get the specs for the 1N4003. I have 50 of them I'd like
to sell, but am unsure of the specs.

Ken WB6QWF
ohio microwave dottttt commmmm

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=pdf+datasheet+1N4003&btnG=Google+Search
has links to datasheets from a number of manufacturers, but they are
common 2000 PIV 1A rectifiers.

Now, I have a question for you. I have a tray of 10 NOS Magnum
Microwave MH22T oscillator modules that were used in the Microdyne
1100-LPR C-Band Sat TV receivers, and I have been looking for the specs.

--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida
Click to expand...

I'm sorry, the MH22T is a 4 GHz mixer in a four lead can a little
larger than a TO-5. I was in a hurry to leave and didn't realize I had
posted the wrong description till I was on the highway.

--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida
 
<lenp@electdiv.com> wrote in message
news:1124089006.105475.211820@g14g2000cwa.googlegroups.com...
Here's a question that bears some thought. The common 1N400x family
of
diodes is available in a wide range of breakdown voltages, and, in
most
catalogs, they are all close to, or the same price! Yup, the 200 PIV
unit and the 1KV part are both about the same price. Now, besides the
PIV, what's the difference? The factory specs show all the 1N400x
diodes on the same sheet, all the specs are the same except for the
PIV
rating.

So the dilemma...Forget about batch testing, and sorting at the
factory. This is about us! Why would you use the lower PIV diode if
the higher rated unit, with a wider safety margin, is available at the
same cost?
Is there some black magic that after 40+ years in this business I have
yet to learn?

Any takers......
Click to expand...
I'm not sure if this applies to the 1N4001 diodes, but it does to the
1N5817 thru 19. The higher voltage ones have slightly higher V drop at
1 amp, so it pays to use the lower V ones if you don't need the higher
V.

With things like switching power supplies, the reverse recovery becomes
important. You really should not use the 1N4001 series with these. But
the reverse recovery and leakage does make some contribution to the
power dissipated by the diode, so using a higher V one might be wise.
 
"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com> wrote
in message news:11g5vlb5skgp45@corp.supernews.com...
I'm not sure if this applies to the 1N4001 diodes, but it does to the
1N5817 thru 19. The higher voltage ones have slightly higher V drop at
1 amp, so it pays to use the lower V ones if you don't need the higher
V.
Click to expand...
Years ago I was told by a Moto FAE that the higher voltage 1N400x parts have
a higher dynamic Z figure. I've personally seen higher V drops in "real
circuits", too, with the higher v parts.

TJL
 
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