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Panasonic schottky or not ?

In the Panasonic schottky diode catalog, there are a number of parts that don't state that the parts are schottky, though the top of the catalog page still carries the schottky barrier diode heading. They share similar part numbering structures and descriptions as parts in the ultrafast rectifier line.

Schottky parts are fabbed using the same 'planar' process, but the 'epitaxial' description seems out of place here.

A possible confusion is aggravated by Panasonic's tendency to describe the reverse recovery time of schottky parts, when positioned in the standard Trr test circuit, where performance is basically an RC effect.

eg:

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Does anyone out there have actual experience in weeding out small signal and rectifier schottkys from UFRs in the Panasonic line-up?

I've only ever used a few of their schottky parts. Conventional fast diodes are easily supplied by more prominent mfrs, so there's never been an issue. Vendors seem only to have the same ambiguous data sheets to draw from. They appear to have no trouble correcting Panasonic's faulty package drawing designations - but descriptions of 'schottky or not' follows the data sheet page catalog section's header.

RL

Reply to
legg
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Well, just look at the forward voltage drop, and you should be able to easily separate Schottky from P-N junction diodes.

Jon

Reply to
Jon Elson

I was looking on ebay at some 6 Amp diodes. There seems to be hundreds of them being sold on ebay, and sold as rectifiers. I dont do much design work, just some repairs, so I have not run across this till now. I just thought a diode is a diode as far as those being sold for rectifiers. And that generally refers to diodes rated at 1A or more.

My intended use at the moment is for a diode to use on a piece of machinery and used to prevent 12 volts DC from back feeding in an alternator charging circuit. One part number that I thought might fit my needs for voltage and amperage was Schottky diode 1N5817. (Which was too light duty for my needs). There are also a whole bunch of diodes being sold for "Solar panel" use, with numbers such as 6A10 (6 amp) or 10A10 (10 amp). There seems to be a ton of them listed on ebay. However both these 6A10 and 10A10, as well as 1N5817 are ALL listed as Schottky. Yet over half of the listings on ebay DO NOT contain that word.

This made me question the suitability of this type of diode for my application. I ended up reading up on the schottky diodes, to learn what makes them different from common diodes. I learned their characteristics, but was left not knowing if they would suit my needs in this charging circuit or not. My guess is that they probably would work just fine, but I'm no expert on circuit design, and dont take chances on something like this, where a costly alternator or the gas engine itself could be damaged by using the wrong diode. I ended up buying a different numbered common diode for this use.

But what gets me, is that close to half the ebay listings do not even use the word "schottky" in their listings. So what would happen if I was building a power supply and used schottky diodes where common diodes were intended? Once again, it looks like they would probably work, but "probably" is not good enough for me. So, selling these without using that word, should not be allowed.

It appears that schottky diodes are probably superior to common silicon diodes, but are they directly interchangable? I dont know????

Reply to
oldschool

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