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Randy C-GRPY
Joined: 21 Apr 2018
Posts: 26
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 Posted: Sat Feb 22, 2020 9:07 am Post subject: Power Duece Schottky diodes |
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I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
Thanks
Randy
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ceengland7(at)gmail.com
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| Posted: Sat Feb 22, 2020 10:11 am Post subject: Power Duece Schottky diodes |
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On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY <rpulis(at)shaw.ca (rpulis(at)shaw.ca)> wrote:
| Quote: | --> AeroElectric-List message posted by: "Randy C-GRPY" <rpulis(at)shaw.ca (rpulis(at)shaw.ca)>
I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
Thanks
Randy
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There are hundreds of choices on ebay, at prices all over the map (even for the same device). ex: The stps12045tv is a dual 60A 45V device with an electrically isolated base (simpler mounting) that can be found for as much as $75, or as little as 2 for $12, if you're willing to wait a few weeks for them to arrive from China. Mouser (major electronics supplier) has them for $20. If you spend more time searching, you might find some even cheaper; I did several months ago.
If you don't need that much current, you can get a whole bag of them for less than $10 in some cases. Do exercise caution when mounting any metal tabbed device, to be sure the tab isn't electrically common to one of the leads. When browsing, just look for voltage above ~20V, at whatever current you need. Remember that current ratings assume significant heat sinking; if you want to avoid mounting on a heat sink, just oversize the device significantly for the job. A legit heat sink will probably cost a lot more than upsizing the device. 
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dual+schottky+diode&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=stps12045tv
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jluckey(at)pacbell.net
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| Posted: Sat Feb 22, 2020 10:32 am Post subject: Power Duece Schottky diodes |
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Randy,
See if this meets your specs...
https://www.mouser.com/productdetail/stmicroelectronics/stth10002tv1?qs=Cak7mXXNf1WSROaFc2i88g%3D%3D
I'm using them to isolate my main buss in my RV-7.
-Jeff
On Saturday, February 22, 2020, 10:22:16 AM PST, Charlie England <ceengland7(at)gmail.com> wrote:
On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY <rpulis(at)shaw.ca (rpulis(at)shaw.ca)> wrote:
| Quote: | --> AeroElectric-List message posted by: "Randy C-GRPY" <rpulis(at)shaw.ca (rpulis(at)shaw.ca)>
I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
Thanks
Randy
|
There are hundreds of choices on ebay, at prices all over the map (even for the same device). ex: The stps12045tv is a dual 60A 45V device with an electrically isolated base (simpler mounting) that can be found for as much as $75, or as little as 2 for $12, if you're willing to wait a few weeks for them to arrive from China. Mouser (major electronics supplier) has them for $20. If you spend more time searching, you might find some even cheaper; I did several months ago.
If you don't need that much current, you can get a whole bag of them for less than $10 in some cases. Do exercise caution when mounting any metal tabbed device, to be sure the tab isn't electrically common to one of the leads. When browsing, just look for voltage above ~20V, at whatever current you need. Remember that current ratings assume significant heat sinking; if you want to avoid mounting on a heat sink, just oversize the device significantly for the job. A legit heat sink will probably cost a lot more than upsizing the device.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dual+schottky+diode&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=stps12045tv
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Randy C-GRPY
Joined: 21 Apr 2018
Posts: 26
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| Posted: Sat Feb 22, 2020 11:00 am Post subject: Re: Power Duece Schottky diodes |
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| jluckey(at)pacbell.net wrote: | Randy,
See if this meets your specs...
https://www.mouser.com/productdetail/stmicroelectronics/stth10002tv1?qs=Cak7mXXNf1WSROaFc2i88g%3D%3D
I'm using them to isolate my main buss in my RV-7.
-Jeff
On Saturday, February 22, 2020, 10:22:16 AM PST, Charlie England <ceengland7> wrote:
On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY <rpulis> wrote:
| Quote: | --> AeroElectric-List message posted by: "Randy C-GRPY" <rpulis>
I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
Thanks
Randy
|
There are hundreds of choices on ebay, at prices all over the map (even for the same device). ex: The stps12045tv is a dual 60A 45V device with an electrically isolated base (simpler mounting) that can be found for as much as $75, or as little as 2 for $12, if you're willing to wait a few weeks for them to arrive from China. Mouser (major electronics supplier) has them for $20. If you spend more time searching, you might find some even cheaper; I did several months ago.
If you don't need that much current, you can get a whole bag of them for less than $10 in some cases. Do exercise caution when mounting any metal tabbed device, to be sure the tab isn't electrically common to one of the leads. When browsing, just look for voltage above ~20V, at whatever current you need. Remember that current ratings assume significant heat sinking; if you want to avoid mounting on a heat sink, just oversize the device significantly for the job. A legit heat sink will probably cost a lot more than upsizing the device.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dual+schottky+diode&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=stps12045tv |
Thanks Jeff. That would probably work for my engine bus. It looks like that one has two power inputs with two discrete outputs. I was more thinking two power inputs with one power output.
I’m not too fussy about the 1V forward drop of that particular item. Also, no it might be oversized for what I need it for. I’m looking at components that draw 10 amps at 12v at most.
Randy
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Randy C-GRPY
Joined: 21 Apr 2018
Posts: 26
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| Posted: Sat Feb 22, 2020 11:36 am Post subject: Re: Power Duece Schottky diodes |
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| ceengland7(at)gmail.com wrote: | On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY <rpulis> wrote:
| Quote: | --> AeroElectric-List message posted by: "Randy C-GRPY" <rpulis>
I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
Thanks
Randy
|
There are hundreds of choices on ebay, at prices all over the map (even for the same device). ex: The stps12045tv is a dual 60A 45V device with an electrically isolated base (simpler mounting) that can be found for as much as $75, or as little as 2 for $12, if you're willing to wait a few weeks for them to arrive from China. Mouser (major electronics supplier) has them for $20. If you spend more time searching, you might find some even cheaper; I did several months ago.
If you don't need that much current, you can get a whole bag of them for less than $10 in some cases. Do exercise caution when mounting any metal tabbed device, to be sure the tab isn't electrically common to one of the leads. When browsing, just look for voltage above ~20V, at whatever current you need. Remember that current ratings assume significant heat sinking; if you want to avoid mounting on a heat sink, just oversize the device significantly for the job. A legit heat sink will probably cost a lot more than upsizing the device.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dual+schottky+diode&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=stps12045tv |
Thanks Charlie. I will look into the link you provided.
Randy
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Sat Feb 22, 2020 11:45 am Post subject: Power Duece Schottky diodes |
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That would work, but with a Vf of .7V, I think the idea that he
has is likely to use the Schottky for less voltage drop.
You can get similar Schottky diodes for similar prices and
only end up with .2 or .3V drop.
Tim
On 2/22/20 12:28 PM, Jeff Luckey wrote:
| Quote: | Randy,
See if this meets your specs...
https://www.mouser.com/productdetail/stmicroelectronics/stth10002tv1?qs=Cak7mXXNf1WSROaFc2i88g%3D%3D
I'm using them to isolate my main buss in my RV-7.
-Jeff
On Saturday, February 22, 2020, 10:22:16 AM PST, Charlie England
<ceengland7(at)gmail.com> wrote:
On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY <rpulis(at)shaw.ca
<mailto:rpulis(at)shaw.ca>> wrote:
<rpulis(at)shaw.ca <mailto:rpulis(at)shaw.ca>>
I want dual diodes to feed alternate power to critical components
with only one power input. The ones sold by Perihelion Designs seem
to fit the bill well but are quite pricey. Are they worth the cost
or are there equally good, cheaper solutions to be considered?
Thanks
Randy
There are hundreds of choices on ebay, at prices all over the map (even
for the same device). ex: The stps12045tv is a dual 60A 45V device with
an electrically isolated base (simpler mounting) that can be found for
as much as $75, or as little as 2 for $12, if you're willing to wait a
few weeks for them to arrive from China. Mouser (major electronics
supplier) has them for $20. If you spend more time searching, you might
find some even cheaper; I did several months ago.
If you don't need that much current, you can get a whole bag of them for
less than $10 in some cases. Do exercise caution when mounting any metal
tabbed device, to be sure the tab isn't electrically common to one of
the leads. When browsing, just look for voltage above ~20V, at whatever
current you need. Remember that current ratings assume significant heat
sinking; if you want to avoid mounting on a heat sink, just oversize the
device significantly for the job. A legit heat sink will probably cost a
lot more than upsizing the device.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dual+schottky+diode&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=stps12045tv
|
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ceengland7(at)gmail.com
Guest
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| Posted: Sat Feb 22, 2020 11:53 am Post subject: Power Duece Schottky diodes |
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On 2/22/2020 1:00 PM, Randy C-GRPY wrote:
| Quote: |
jluckey(at)pacbell.net wrote:
> Randy,
> See if this meets your specs...
> https://www.mouser.com/productdetail/stmicroelectronics/stth10002tv1?qs=Cak7mXXNf1WSROaFc2i88g%3D%3D (https://www.mouser.com/productdetail/stmicroelectronics/stth10002tv1?qs=Cak7mXXNf1WSROaFc2i88g%3D%3D)
>
> I'm using them to isolate my main buss in my RV-7.
> -Jeff
>
> On Saturday, February 22, 2020, 10:22:16 AM PST, Charlie England wrote:
>
>
>
>
>
>
> On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY wrote:
>>
>>
>> I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
>>
>> Thanks
>> Randy
>>
>>
>
> There are hundreds of choices on ebay, at prices all over the map (even for the same device). ex: The stps12045tv is a dual 60A 45V device with an electrically isolated base (simpler mounting) that can be found for as much as $75, or as little as 2 for $12, if you're willing to wait a few weeks for them to arrive from China. Mouser (major electronics supplier) has them for $20. If you spend more time searching, you might find some even cheaper; I did several months ago.
> If you don't need that much current, you can get a whole bag of them for less than $10 in some cases. Do exercise caution when mounting any metal tabbed device, to be sure the tab isn't electrically common to one of the leads. When browsing, just look for voltage above ~20V, at whatever current you need. Remember that current ratings assume significant heat sinking; if you want to avoid mounting on a heat sink, just oversize the device significantly for the job. A legit heat sink will probably cost a lot more than upsizing the device.
> https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dual+schottky+diode&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=stps12045tv (https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dual+schottky+diode&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=stps12045tv)
Thanks Jeff. That would probably work for my engine bus. It looks like that one has two power inputs with two discrete outputs. I was more thinking two power inputs with one power output.
Randy
The part # I quoted, and the link Jeff sent, are the same package.
|
Jeff's version is 50A current handling instead of 60A and 200V instead
of 40V. Either one can do what you want by simply tying the cathodes
together. It'll cost you an extra ring terminal (and a butt splice, if
you feed the output through a few inches of 'ballast' wire off each
terminal).
Charlie
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jluckey(at)pacbell.net
Guest
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| Posted: Sat Feb 22, 2020 12:51 pm Post subject: Power Duece Schottky diodes |
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Randy,
It's a 2 diode package. You can wire it any way you want.
Let me know if you have any questions,
-Jeff
On Saturday, February 22, 2020, 11:11:46 AM PST, Randy C-GRPY <rpulis(at)shaw.ca> wrote:
--> AeroElectric-List message posted by: "Randy C-GRPY" <rpulis(at)shaw.ca (rpulis(at)shaw.ca)>
jluckey(at)pacbell.net wrote:
| Quote: | See if this meets your specs...
|
| Quote: | I'm using them to isolate my main buss in my RV-7.
|
| Quote: | On Saturday, February 22, 2020, 10:22:16 AM PST, Charlie England wrote:
|
| Quote: | On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY wrote:
|
| Quote: | > --> AeroElectric-List message posted by: "Randy C-GRPY"
|
| Quote: | > I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
|
| Quote: | There are hundreds of choices on ebay, at prices all over the map (even for the same device). ex: The stps12045tv is a dual 60A 45V device with an electrically isolated base (simpler mounting) that can be found for as much as $75, or as little as 2 for $12, if you're willing to wait a few weeks for them to arrive from China. Mouser (major electronics supplier) has them for $20. If you spend more time searching, you might find some even cheaper; I did several months ago.
|
| Quote: | If you don't need that much current, you can get a whole bag of them for less than $10 in some cases. Do exercise caution when mounting any metal tabbed device, to be sure the tab isn't electrically common to one of the leads. When browsing, just look for voltage above ~20V, at whatever current you need. Remember that current ratings assume significant heat sinking; if you want to avoid mounting on a heat sink, just oversize the device significantly for the job. A legit heat sink will probably cost a lot more than upsizing the device.
|
Thanks Jeff. That would probably work for my engine bus. It looks like that one has two power inputs with two discrete outputs. I was more thinking two power inputs with one power output.
Randy
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Sat Feb 22, 2020 12:53 pm Post subject: Re: Power Duece Schottky diodes |
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Mouser part: 511-STPS200170TV1Y
Mouser part: 78-VS-QA250FA20
Mouser part: 863-MBRF20L45CTG only costs $0.83
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chaskuss(at)yahoo.com
Guest
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| Posted: Sat Feb 22, 2020 2:41 pm Post subject: Power Duece Schottky diodes |
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Jeff and Randy, The diode pack that Jeff supplied the link to is not ideal for our purposes. It's really designed for heavy duty welding equipment. It has a seven tenths of a volt dro forward. That means that when power is being supplied through that diode pack you lose seven tenths of a volt. You want to try and find one of these things that only has a 0.2 or 0.3 volt drop in the forward Direction. Pull up the product data sheet for any of these that interest you. Then look on the datasheet for VF. That is the forward voltage drop rating for that device.
Charlie
Sent from Yahoo Mail on Android
| Quote: | On Sat, Feb 22, 2020 at 4:57 PM, Randy C-GRPY
<rpulis(at)shaw.ca> wrote:
--> AeroElectric-List message posted by: "Randy C-GRPY" <rpulis(at)shaw.ca (rpulis(at)shaw.ca)>
jluckey(at)pacbell.net wrote:
| Quote: | See if this meets your specs...
|
| Quote: | I'm using them to isolate my main buss in my RV-7.
|
| Quote: | On Saturday, February 22, 2020, 10:22:16 AM PST, Charlie England wrote:
|
| Quote: | On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY wrote:
|
| Quote: | > --> AeroElectric-List message posted by: "Randy C-GRPY"
|
| Quote: | > I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
|
| Quote: | There are hundreds of choices on ebay, at prices all over the map (even for the same device). ex: The stps12045tv is a dual 60A 45V device with an electrically isolated base (simpler mounting) that can be found for as much as $75, or as little as 2 for $12, if you're willing to wait a few weeks for them to arrive from China. Mouser (major electronics supplier) has them for $20. If you spend more time searching, you might find some even cheaper; I did several months ago.
|
| Quote: | If you don't need that much current, you can get a whole bag of them for less than $10 in some cases. Do exercise caution when mounting any metal tabbed device, to be sure the tab isn't electrically common to one of the leads. When browsing, just look for voltage above ~20V, at whatever current you need. Remember that current ratings assume significant heat sinking; if you want to avoid mounting on a heat sink, just oversize the device significantly for the job. A legit heat sink will probably cost a lot more than upsizing the device.
|
Thanks Jeff. That would probably work for my engine bus. It looks like that one has two power inputs with two discrete outputs. I was more thinking two power inputs with one power output.
Randy
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=494947#494947
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Randy C-GRPY
Joined: 21 Apr 2018
Posts: 26
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| Posted: Sat Feb 22, 2020 3:04 pm Post subject: Re: Power Duece Schottky diodes |
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Thanks fellas for chiming in. I'm on the steep part of the learning curve. I was thinking about using the DSS2X61-0045A although I'm still planning on browsing for less expensive alternatives that will do the job adequately. I like the style of the one referenced simply because it looks ready to connect and mount.
One question: For low current applications such as those in our aircraft, watts should be pretty low. How do I determine if a heat sink is required?
Also, how are the electrical connections made to the pins of the diode typically?
The diodes with the prongs look like there should be a matching plug.
Randy
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Sat Feb 22, 2020 4:31 pm Post subject: Re: Power Duece Schottky diodes |
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Most of the diodes discussed above will drop about 0.5 volts at 10 amps.
The power loss will be 0.5 x 10 = 5 watts. That will produce lots of heat.
Have you ever touched a 3 watt incandescent night light?
So yes, use a heat sink with heat conductive paste.
The aircraft structure can serve as a heat sink if it is aluminum.
If the diode mounting surface is not electrically insulated from the diode terminals, then some
type of dielectric heat conductive film must be used between the diode and mounting surface.
If a TO−220 diode is used, solder wires to the 3 terminals.
A coating of E6000 will insulate and protect the terminals from vibration.
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johnbright
Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA
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| Posted: Sat Feb 22, 2020 4:43 pm Post subject: Re: Power Duece Schottky diodes |
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| Randy C-GRPY wrote: | Also, how are the electrical connections made to the pins of the diode typically?
The diodes with the prongs look like there should be a matching plug.
Randy |
Hi Randy, those are TO-220 cases designed for circuit board mount. They have their very own Wikipedia page. https://en.m.wikipedia.org/wiki/TO-220
I suggest soldering to them like this: http://www.aeroelectric.com/articles/Solder_Lap_Splicing/Solder_Lap_Splices.html
Apply heat as quickly as possible to avoid damaging the diode.
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_________________
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
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Randy C-GRPY
Joined: 21 Apr 2018
Posts: 26
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| Posted: Sat Feb 22, 2020 9:17 pm Post subject: Re: Power Duece Schottky diodes |
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| user9253 wrote: | Most of the diodes discussed above will drop about 0.5 volts at 10 amps.
The power loss will be 0.5 x 10 = 5 watts. That will produce lots of heat.
Have you ever touched a 3 watt incandescent night light?
So yes, use a heat sink with heat conductive paste.
The aircraft structure can serve as a heat sink if it is aluminum.
If the diode mounting surface is not electrically insulated from the diode terminals, then some
type of dielectric heat conductive film must be used between the diode and mounting surface.
If a TO−220 diode is used, solder wires to the 3 terminals.
A coating of E6000 will insulate and protect the terminals from vibration. |
Thank you Joe. I'm going to be mounting the diodes on the subpanel which is aluminium and most of the components will be less than 5 amps. Based on what you just said, I think that a heat sink likely isn't necessary other than using the panel.
Randy
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ceengland7(at)gmail.com
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| Posted: Sun Feb 23, 2020 6:24 am Post subject: Power Duece Schottky diodes |
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On Sat, Feb 22, 2020 at 11:24 PM Randy C-GRPY <rpulis(at)shaw.ca> wrote:
[quote]
user9253 wrote:
> Most of the diodes discussed above will drop about 0.5 volts at 10 amps
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rv8iator
Joined: 11 Apr 2006
Posts: 145
Location: Newberg, OR
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| Posted: Mon Feb 24, 2020 5:19 am Post subject: Power Duece Schottky diodes |
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Beware of counterfeit semiconductors on EBay...
https://www.electro-tech-online.com/blog-entries/watch-out-for-counterfeit-transistors.78Â
I purchased some 2N3055 power bipolors. cut them open and they were counterfeit. Tiny die compared to the original STMicro parts. This may be the case when you see bargain low ball prices for other semiconductors. The modus operandi seems to be to re label parts that look identical to the original but are of lower power higher noise spec.
Chris
RV-8 twice
On Sat, Feb 22, 2020 at 10:17 AM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: |
On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY <rpulis(at)shaw.ca (rpulis(at)shaw.ca)> wrote:
| Quote: | --> AeroElectric-List message posted by: "Randy C-GRPY" <rpulis(at)shaw.ca (rpulis(at)shaw.ca)>
I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
Thanks
Randy
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There are hundreds of choices on ebay, at prices all over the map (even for the same device). ex: The stps12045tv is a dual 60A 45V device with an electrically isolated base (simpler mounting) that can be found for as much as $75, or as little as 2 for $12, if you're willing to wait a few weeks for them to arrive from China. Mouser (major electronics supplier) has them for $20. If you spend more time searching, you might find some even cheaper; I did several months ago.
If you don't need that much current, you can get a whole bag of them for less than $10 in some cases. Do exercise caution when mounting any metal tabbed device, to be sure the tab isn't electrically common to one of the leads. When browsing, just look for voltage above ~20V, at whatever current you need. Remember that current ratings assume significant heat sinking; if you want to avoid mounting on a heat sink, just oversize the device significantly for the job. A legit heat sink will probably cost a lot more than upsizing the device.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dual+schottky+diode&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=stps12045tv
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C. Stone (RV8iator) |
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Randy C-GRPY
Joined: 21 Apr 2018
Posts: 26
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| Posted: Mon Feb 24, 2020 7:15 pm Post subject: Re: Power Duece Schottky diodes |
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| rv8iator wrote: | Beware of counterfeit semiconductors on EBay...
https://www.electro-tech-online.com/blog-entries/watch-out-for-counterfeit-transistors.78Â
I purchased some 2N3055 power bipolors. cut them open and they were counterfeit. Tiny die compared to the original STMicro parts. This may be the case when you see bargain low ball prices for other semiconductors. The modus operandi seems to be to re label parts that look identical to the original but are of lower power higher noise spec.
Chris
RV-8 twice
On Sat, Feb 22, 2020 at 10:17 AM Charlie England <ceengland7> wrote:
| Quote: |
On Sat, Feb 22, 2020 at 11:14 AM Randy C-GRPY <rpulis> wrote:
| Quote: | --> AeroElectric-List message posted by: "Randy C-GRPY" <rpulis>
I want dual diodes to feed alternate power to critical components with only one power input. The ones sold by Perihelion Designs seem to fit the bill well but are quite pricey. Are they worth the cost or are there equally good, cheaper solutions to be considered?
Thanks
Randy
|
There are hundreds of choices on ebay, at prices all over the map (even for the same device). ex: The stps12045tv is a dual 60A 45V device with an electrically isolated base (simpler mounting) that can be found for as much as $75, or as little as 2 for $12, if you're willing to wait a few weeks for them to arrive from China. Mouser (major electronics supplier) has them for $20. If you spend more time searching, you might find some even cheaper; I did several months ago.
If you don't need that much current, you can get a whole bag of them for less than $10 in some cases. Do exercise caution when mounting any metal tabbed device, to be sure the tab isn't electrically common to one of the leads. When browsing, just look for voltage above ~20V, at whatever current you need. Remember that current ratings assume significant heat sinking; if you want to avoid mounting on a heat sink, just oversize the device significantly for the job. A legit heat sink will probably cost a lot more than upsizing the device.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dual+schottky+diode&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=stps12045tv
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Thanks for the heads up. I think I will stick to Digikey, Mouser, or Newark. I’m thinking they don’t buy from unknown suppliers.
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