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Generators & Electric Motors General Discussion

Diode Specs


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  #1  
Old 10-15-2011, 01:10:31 PM
David K David K is offline
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Default Diode Specs

I'm trying to find the specs on a CR38148 diode. I Google'd "diode cr38148" & "cr38148" and didn't find anything. Does anybody know the specs on this diode or where I can find it? Thanks.

Dave
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Old 10-15-2011, 01:35:38 PM
Fred M. Fred M. is offline
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Default Re: diode specs

David-

There may be more than one diode with the same part number. It would be helpful to know what it is used in.

I Googled 38148 diode. Does it look like the CR3814800 at the bottom of this page?
http://www.pecrectifier.com/semiconductors.html

I also found CR38148 mentioned with no specs at
http://www.industrialsemi.com/invent...tter=C&page=12

Fred
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Old 10-15-2011, 07:58:04 PM
K D Redd K D Redd is offline
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Default Re: diode specs

NOT to ask a stupid question BUT is this CR38148 on the old diode you have or is this number on the circuit board by the diode. If this number is on the circuit board, This number is it's circuit reference designator NOT the diode's Part Number. Most circuit board mark diodes as CR and then a number. Sometime CR is even used for Zener diodes but sometimes ZD is used for zener diodes.

Kent
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Old 10-15-2011, 10:05:34 PM
Arkie Arkie is offline
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Default Re: diode specs

And sometimes GE, Motorola, etc, use their own numbers on diodes, and transistors and you cannot cross refernce such! They make the diodes etc, in bulk and sell to companys that assemble the control equipment.
(and 5 numbers is not normal for a diode, normally only 4)

If you don't see it at mouser, Digitech or Allied it's most likely you won't find any specs.

What kind of equipment is it used in or do you know that input volts and output loading???
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Old 10-16-2011, 07:35:22 AM
armandh armandh is offline
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Default Re: diode specs

modern diodes are easy to substitute

diodes have a current rating [A]
this rating should be higher than any expected current or protective fuze

diodes have a peak inverse voltage rating [piv]
this rating should be higher than any ac peak [not RMS] voltage

exceeding these ratings is not harmful given space and cost considerations
using a 10 A @ 200 Volts where you only needed a 5 A @ 100 will likely work just fine
huge over rating is expensive, wont fit, and may involve other problems.

it easiest to use diodes in a similar package [axial, bridge package, etc]
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Old 10-16-2011, 09:44:14 PM
David K David K is offline
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Default Re: diode specs

Quote:
Originally Posted by Fred M. View Post
Does it look like the CR3814800 at the bottom of this page?
Yes, it does. Is it safe to say that CR38148 and CR3814800 are the same? And that CR38148's are 300A and 600V?

To all those who asked.... I'm not looking for a CR38148. Instead I found a bunch of them at surplus price. I was going to buy some of them for future projects or maybe I'll buy all of them and try to make a buck or two on ebay. What do these things go for new?

Dave
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Old 10-16-2011, 09:53:57 PM
David K David K is offline
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Default Re: Diode Specs

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Old 10-17-2011, 06:04:54 AM
Arkie Arkie is offline
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Default Re: Diode Specs

You could compare prices using the 300amp at 600 piv specs at the vendors I named above!

Hobbiest that are into DC welders, and those would be great as a replacement for the diodes in the large automotive battery chargers, type chargers for starting vechicles. Also if they are all same polarity they would not sell as good. (all common Anode or Common cathode) If some are Reversed polarity they are more user friendly. I've also used the high amperage silcon diodes (usually in the 100amp @ 100 PIV range) as replacements in the old style automotive variable switch output selectable charge rate battery chargers that used the old obselete selenium rectifiers. I would have to shop and get them as surplus to keep the price down with-in reason.

Sometimes the large diodes don't sell very fast in large amounts! You can find similiar on e-bay and watch and see a selling/buying price!
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Old 10-17-2011, 08:28:47 AM
K D Redd K D Redd is offline
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Default Re: Diode Specs

NTE6356 cathode to case and NTE6357 anode to case 300 Amp/600Prv. NTE 6102 cathode/NTE6103 Anode 550 Amp/600Prv. Both have 3/4 inch by 16 tpi studs.

Kent
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Old 10-20-2011, 11:35:29 PM
Motorwinder Motorwinder is offline
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Default Re: Diode Specs

http://www.galco.com/scripts/cgiip.e...um=CR38148-NBR
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Old 10-21-2011, 11:30:10 AM
Fred M. Fred M. is offline
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Default Re: Diode Specs

I followed that link, which led to Process Electronics company, which is the PEC link (http://www.pecrectifier.com/semiconductors.html). I could not find any specifications other than the basic voltage and current.

They might not be the original manufacturer. It could be a rebranded part from some other power rectifier company like International Rectifier.

There should be a diode symbol on the body to indicate polarity. Note that the same number with an R0 suffix is the reverse diode. If you obtain them from a surplus electronics source, there might be a mixture of polarity in any given batch.

Fred
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