1N457 need equivalent

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Artur
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1N457 need equivalent

Post by Artur » Sat Sep 27, 2008 7:26 am

Hi guys, I can't seem to find this diode (1N457) or I have to buy a minimum of 150 pieces. I need it for a battery charger that I'm building, an equivalent diode would be great but I'm having trouble with that too. any help would be appreciated.

Bigglez
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Re: 1N457 need equivalent

Post by Bigglez » Sat Sep 27, 2008 9:48 am

Artur wrote:Hi guys, I can't seem to find this diode (1N457) or I have to buy a minimum of 150 pieces. I need it for a battery charger that I'm building, an equivalent diode would be great but I'm having trouble with that too. any help would be appreciated.
Here's the datasheet.
This appears to be a common small signal diode with
a 200mA current and 70V PIV rating.

Any silicon diode could be used (such as 1N4002), unless
your circuit is relying upon unusual properties of the
subject diode.

Was this your own design or did you get the circuit from
another source? To help us help you, can you post the
schematic here?

Artur
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Post by Artur » Sat Sep 27, 2008 4:03 pm

Hi, this is a design I found online, I'm going to use it to charge a small lead acid battery non automotive the type used in hallway emergency lights. Here is the link http://www.electronics-project-design.c ... arger.html

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Janitor Tzap
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Re: 1N457 need equivalent

Post by Janitor Tzap » Sat Sep 27, 2008 5:17 pm

Artur wrote:Hi guys, I can't seem to find this diode (1N457) or I have to buy a minimum of 150 pieces. I need it for a battery charger that I'm building, an equivalent diode would be great but I'm having trouble with that too. any help would be appreciated.
Hi Artur,

I've looked at that Schematic for the battery charger.
That is a Switching Diode.
And in this application, a regular 1N4002 won't do.

But NTE has a cross for it.
NTE177.
MCM Electronics carries it for $1.13.
Mouser Electronics carries it for $1.08.
Jameco Electronics has the 1N457, But you must order 10 & $0.012 each.
{I think that's a typo, and it's more like $0.12 each.}
DigiKey Electronics Carries the 1N457, But you must order 2000 & $0.012 each.

Well, good luck with the build.


Signed: Janitor Tzap

Dean Huster
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Post by Dean Huster » Sat Sep 27, 2008 7:33 pm

DigiKey Electronics Carries the 1N457, But you must order 2000 & $0.012 each
Where are you getting that? I've never known Digi-Key to force you to order more than one of an electronic part. They have surcharges and such depending upon the amount of the order, but no quantity demands.

Dean
Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).

R.I.P.

Robert Reed
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Post by Robert Reed » Sat Sep 27, 2008 8:29 pm

Hello Artur
I really think any garden variety diode from a 1N914 signal diode to a 1N4002 mid power diode would work in your case. U2 appears to be a comparator that trips when the charging current reduces to the point that pin 2 voltage becomes more positive than pin 3 voltage forcing the output pin 6 to a negative voltage which turns on D1. No super fast switching required here. At that point Q1 conducts to light the LED and R6 is intoduced to the regulators adjust circuit by parrelleling R2 and reducing regulator output to 12.5V instead of 14.5v.

BTW - its a nifty circuit!

Bigglez
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Re: 1N457 need equivalent

Post by Bigglez » Sun Sep 28, 2008 1:25 am

Janitor Tzap wrote:I've looked at that Schematic for the battery charger. That is a Switching Diode.
And in this application, a regular 1N4002 won't do.
The battery charger is based on a linear regulator
(not a switcher). The diode is an ordinary signal diode,
and just about any substitute will do. 1N4148 comes to mind.

Bigglez
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Post by Bigglez » Sun Sep 28, 2008 1:38 am

Artur wrote:I'm going to use it to charge a small lead acid battery non automotive the type used in hallway emergency lights.
Problem is that it is scaled to car battery with a 2A fast charge
and about 150mA trickle charge. Your battery is probably much
smaller capacity and may have a lower charge current limit.

The 7Ahr 12V Ex-emergency lighting lead-acid battery I keep
on my work bench has a charge limit of 2.1A and 15.0V for fast
charging.

Modding that charger circuit for lower current is little
more than a resistor change or two.

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Janitor Tzap
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Post by Janitor Tzap » Sun Sep 28, 2008 8:35 am

Dean Huster wrote:
DigiKey Electronics Carries the 1N457, But you must order 2000 & $0.012 each
Where are you getting that? I've never known Digi-Key to force you to order more than one of an electronic part. They have surcharges and such depending upon the amount of the order, but no quantity demands.

Dean
I got it from this search on the Digikey Web Site.
http://search.digikey.com/scripts/DkSea ... &x=19&y=15
Bigglez wrote:
Janitor Tzap wrote:
I've looked at that Schematic for the battery charger. That is a Switching Diode.
And in this application, a regular 1N4002 won't do.
The battery charger is based on a linear regulator
(not a switcher). The diode is an ordinary signal diode,
and just about any substitute will do. 1N4148 comes to mind.
Hmm.......

Well I've had to repair power supplies, and audio equipment that some other guy went,
and just put in any old diode or transistor.
Just to get it working, and out the door.
Thus, when I get too see it when it has stopped working again.
It's not just the diode or transistor that has to be replaced. :lol:


Signed: Janitor Tzap

Bigglez
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Post by Bigglez » Mon Sep 29, 2008 11:56 am

Dean Huster wrote:
DigiKey Electronics Carries the 1N457, But you must order 2000 & $0.012 each
Where are you getting that? I've never known Digi-Key to force you to order more than one of an electronic part. They have surcharges and such depending upon the amount of the order, but no quantity demands.
Digikey has dropped the $25 minimum order requirement (as
of May08, IIRC).

Digikey does not stock every item in the catalog or website.
Some items are only available in min qty lots.

When items that were in the general catalog fail to meet
expectations for inventory turns the item is flagged as
no longer carried, although the balance of the inventory
is still available (often in single qty), and the item can be
re-ordered at the new minimum qty.

This has been a problem for me as I picked a few parts
expecting them to be around for a while, and now they are
min qty buys.

Here's an example of "Non-stock" "Min-buys" at Digikey

The internet has improved my efficiency as a buyer, its
only fair that the same technology has improved Digikey
(and many others) ability as a seller. They only sell what
the majority of customers want and buy often - pick an
odd ball item and one is SOL.

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franklucido
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Re: 1N457 need equivalent

Post by franklucido » Wed Jun 05, 2019 10:38 pm

Janitor Tzap wrote:

I got it from this search on the Digikey Web Site.
http://search.digikey.com/scripts/DkSea ... ll?lang=en site US&cheap essay&keywords...&x=19&y=15

Hmm.......

Well I've had to repair power supplies, and audio equipment that some other guy went,
and just put in any old diode or transistor.
Just to get it working, and out the door.
Thus, when I get too see it when it has stopped working again.
It's not just the diode or transistor that has to be replaced. :lol:


Signed: Janitor Tzap
I've been referred here by the Ebay review on DigiKey. I've just checked several customer reviews and mostly people say their support is a mess. I wanted to order a controller, but I'm not sure now...

Edit: oh, sorry, just saw that the topic is quite old.

dyarker
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Re: 1N457 need equivalent

Post by dyarker » Thu Jun 06, 2019 9:26 am

Use 1N4148 to replace a 1N457.

Whose support is a mess? And, says who?
Dale Y

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haklesup
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Re: 1N457 need equivalent

Post by haklesup » Thu Jun 06, 2019 1:02 pm

Digikey was a good website 11 years ago, its even better now. As for support, expect limits, they are not design engineers, they can cross reference and help you find or buy stuff but they probably cannot recommend part numbers based on application or design questions.

BTW, what kind of reviews on Ebay discuss vendors outside ebay and then lead here? can you post a link

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