Guess This Graph

[Tim Williams]

It's time for another round of:

Guess This Graph!

See the following datasheet:
http://www.infineon.com/dgdl/IDH04G...a1bd3&fileId=db3a304339dcf4b1013a033ff5d95947
(apparently they don't have shorter links; part is IDH04G65C5XKSA1)
Bottom right page 6, forward characteristics (surge).

The region below 3V is clearly the stuff magnified to the left, but what
the hell is the linear region about (>3.8V @ 175C, >5.4V @ -55C)?

Tim

 

[RipeCrisbies]

http://www.infineon.com/dgdl/IDH04G65C5_Final_Datasheet_v_2_1.pdf? folderId=db3a30431ddc9372011ed0010fda1bd3&fileId=db3a304339dcf4b1013a033ff5d95947
(apparently they don't have shorter links; part is IDH04G65C5XKSA1)

How about http://tinyurl.com/ar2q5ys



--
M0WYM
www.radiowymsey.org

Sales @ radiowymsey
http://stores.ebay.co.uk/Sales-At-Radio-Wymsey/

 

[Fred Abse]

It's time for another round of:

Guess This Graph!

See the following datasheet:
http://www.infineon.com/dgdl/IDH04G...a1bd3&fileId=db3a304339dcf4b1013a033ff5d95947
(apparently they don't have shorter links; part is IDH04G65C5XKSA1)
Bottom right page 6, forward characteristics (surge).

The region below 3V is clearly the stuff magnified to the left, but what
the hell is the linear region about (>3.8V @ 175C, >5.4V @ -55C)?

Interesting characteristic. The divergence above about 32.5A is
interesting, too.

Needless to say, the Infineon Spice model doesn't reflect this behavior.

I guess I shall have to buy one and CT it.

 

[Robert Baer]

It's time for another round of:

Guess This Graph!

See the following datasheet:
http://www.infineon.com/dgdl/IDH04G...a1bd3&fileId=db3a304339dcf4b1013a033ff5d95947
(apparently they don't have shorter links; part is IDH04G65C5XKSA1)
Bottom right page 6, forward characteristics (surge).

The region below 3V is clearly the stuff magnified to the left, but what
the hell is the linear region about (>3.8V @ 175C,>5.4V @ -55C)?

Tim

Am guessing that is the resistivity of the bulk (doped) silicon.

 

[Tim Williams]

Am guessing that is the resistivity of the bulk (doped) silicon.

But isn't that the normal stuff under 8A, with a typical positive tempco?
What about the re-bunching? It's just.... weird!!

Tim

 

[Rocky]

It's time for another round of:

Guess This Graph!

See the following datasheet:

http://www.infineon.com/dgdl/IDH04G...a1bd3&fileId=db3a304339dcf4b1013a033ff5d95947

Looks like it would make quite a nice varicap diode. 1v to 10v rev bias gives a nice change in capacitance from about 140pF to 60pF.

 

[Tim Williams]

Looks like it would make quite a nice varicap diode. 1v to 10v rev bias
gives a nice change in capacitance from about 140pF to 60pF.

That's nothing new -- big power schottkies will do 30nF at zero bias down
to a few nF at rated voltage. They tend to stink as varactors though.
That said, SiC may have lower dielectric loss!

Tim

 

[Tim Williams]

Infineon replied!

Apparently, it's due to P-N junctions kicking in, perhaps guard ring stuff or something like that. Suffice it to say, an SiC schottky isn't a crystal with a layer of metal glued to it, they do more work to them than that.

They also gave me a reference:
Heinze/Neumeister/Rupp: Surge Current Ruggedness of Silicon Carbide Schottky- and Merged-PiN-Schottky Diodes, ISPSD 2008

So if you're still curious, and have access to IEEE,
http://ieeexplore.ieee.org/xpl/arti...r=4538944&contentType=Conference+Publications
you can get some more answers.

Tim