EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: vlad777 on December 24, 2016, 07:40:06 pm
-
What type of componets are Darlington, Sziklai, IGBT, SCR(Thyristor), TRIAC
These are technically integrated circuits, but nobody calls them ICs.
But how would you call them?
What type they belong to?
" Composite components " ?
" Combined components "?
I suppose one calls them simply transistor pairs.
But what about TRIACs they theoretically consist of four transistors, and we don't consider them ICs?
Many Thanks.
-
If anything, they're topologies / arrangements. Technically, the only one that's manufactured as an actual component, are Darlington pairs. I don't think i've heard of Sziklai pairs / CFPs ever manufactured as a single device.
https://en.wikipedia.org/wiki/Darlington_transistor
https://en.wikipedia.org/wiki/Sziklai_pair
Some of the denominations may well stem from their actual functions, rather than their compositions. TRIACs would be a sort of semi-controllable diodes, if you think about it.
Also, statistically, IC's are more often (rather complex) small-signal devices, while SCRs, IGBTs and such are (viewed as) quite simple, single-function monolithic power devices.
... But that's just my view :)
-
Yes Sziklais are not single devices.
Another example came to mind.
All MOSFETs have protection diodes. So two components in one package on one die , IC or what?
-
No, not all MOSFETs have protection diodes.
True, all MOSFETs have that parasitic so-called "body diode" between drain and source, but that's only a consequence / side-effect of the physical construction of the device.
Some MOSFETs have an internal (possibly Zener?) clamp between gate and source - that's what i'd count as "protection diode".
http://www.ixys.com/Documents/AppNotes/IXAN0061.pdf (http://www.ixys.com/Documents/AppNotes/IXAN0061.pdf) - page 2.
Another example came to mind.
All MOSFETs have protection diodes. So two components in one package on one die , IC or what?
-
Thanks for the pdf, i didn't know that body diodes are parasitic components.
Some MOSFETs ... , IC or what?
-
It really depends. A quick google for "mosfet protected gate" produced several (types of) results:
http://www.onsemi.com/pub_link/Collateral/AND8202-D.PDF (http://www.onsemi.com/pub_link/Collateral/AND8202-D.PDF)
http://www.st.com/content/ccc/resource/technical/document/datasheet/5e/25/44/34/36/e7/49/93/CD00045633.pdf/files/CD00045633.pdf/jcr:content/translations/en.CD00045633.pdf (http://www.st.com/content/ccc/resource/technical/document/datasheet/5e/25/44/34/36/e7/49/93/CD00045633.pdf/files/CD00045633.pdf/jcr:content/translations/en.CD00045633.pdf)
-
Well if it has temperature and current limiting , for me that is definitely an IC.
What about just two or three simple components on a die?
-
It really depends. A quick google for "mosfet protected gate"
If you want a protected gate you basically have to dig through datasheets, it's rarely mentioned in the text. Most of the time you can only see it in the diagram and the absolute max gate currents. Sometimes the protection doesn't even show up in the diagram and all you get is the max gate current.