1N457 need equivalent
1N457 need equivalent
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.
Re: 1N457 need equivalent
Here's the datasheet.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.
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?
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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Re: 1N457 need equivalent
Hi Artur,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.
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
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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 Electronics Carries the 1N457, But you must order 2000 & $0.012 each
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.
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
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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!
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!
Re: 1N457 need equivalent
The battery charger is based on a linear regulatorJanitor 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.
(not a switcher). The diode is an ordinary signal diode,
and just about any substitute will do. 1N4148 comes to mind.
Problem is that it is scaled to car battery with a 2A fast chargeArtur wrote:I'm going to use it to charge a small lead acid battery non automotive the type used in hallway emergency lights.
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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I got it from this search on the Digikey Web Site.Dean Huster wrote: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 Electronics Carries the 1N457, But you must order 2000 & $0.012 each
Dean
http://search.digikey.com/scripts/DkSea ... &x=19&y=15
Hmm.......Bigglez wrote:The battery charger is based on a linear regulatorJanitor 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.
(not a switcher). The diode is an ordinary signal diode,
and just about any substitute will do. 1N4148 comes to mind.
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.
Signed: Janitor Tzap
Digikey has dropped the $25 minimum order requirement (asDean Huster wrote: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 Electronics Carries the 1N457, But you must order 2000 & $0.012 each
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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Re: 1N457 need equivalent
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...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.
Signed: Janitor Tzap
Edit: oh, sorry, just saw that the topic is quite old.
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Re: 1N457 need equivalent
Use 1N4148 to replace a 1N457.
Whose support is a mess? And, says who?
Whose support is a mess? And, says who?
Dale Y
Re: 1N457 need equivalent
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
BTW, what kind of reviews on Ebay discuss vendors outside ebay and then lead here? can you post a link
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