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Registered Member #1538
Joined: Thu Jun 12 2008, 07:28PM
Location: Bonn, Germany
Posts: 28
Hi
The HGTG40N60A4 seems to be the TO 247 version. I guess what most people are referring to, when talking about “40N60â€, might be the HGT1N40N60A4 / HGT1N40N60A4D. These come in the SOT 227 “mini-brick†package. But because I never used them yet, maybe someone else knows better.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
The problem is, SOT227 is very hard to get today for little people. Actually it's easier and cheaper silicon/cost to get CM300 and bigger bricks which are abundant on ebay!
One thing I'm interested about for drsstc's, what power levels can you guys generally attain with TO247 with use of sil pads? I wouldn't think more than like 300W would be possible, but I may be wrong... 1000W doesn't sound realistic?
Only way to go with TO247 packages is separate isolated heatsink for each device and clamp mounting, which is rather complex in comparison to simply slapping 4 SOT227 packages onto a big heatsink.
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Dr.quitting the dr. thing wrote ...
Only way to go with TO247 packages is separate isolated heatsink for each device and clamp mounting, which is rather complex in comparison to simply slapping 4 SOT227 packages onto a big heatsink.
Let me just make sure I'm clear on this; the reasoning here is because the metal tab on the SOT227 is isolated, whereas TO247 has it tied to the collector, correct?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Dr.quitting the dr. thing wrote ...
The problem is, SOT227 is very hard to get today for little people. Actually it's easier and cheaper silicon/cost to get CM300 and bigger bricks which are abundant on ebay!
One thing I'm interested about for drsstc's, what power levels can you guys generally attain with TO247 with use of sil pads? I wouldn't think more than like 300W would be possible, but I may be wrong... 1000W doesn't sound realistic?
Only way to go with TO247 packages is separate isolated heatsink for each device and clamp mounting, which is rather complex in comparison to simply slapping 4 SOT227 packages onto a big heatsink.
Marko
I've run DRSSTCs using TO-247 IGBTs at power levels exceeding 1000 watts. Of course, thermal design is absolutely critical and can be quite complex for these power levels. For my TO-247 (i actually used the SMT version TO-268 or D3PAK), the IGBTs were attached to an IMS board (Integrated Metal Substrate) board which is basically an aluminum circuit board, with thermal vias which allow heat to spread out very effectively. However, for TO-247 mounted to a heatsink directly, i would suspect much less performance.
Just remember - the MOST important part of heatsinking those TO-247s is the INTERFACE between the device and the heatsink. Many people don't realize this, but most of your thermal impedance (and resulting delta T) from junction to heatsink is within this interface.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
But i guess, that To247 (here is To-247MAx, no maintain hole) have same silicon lust, but SOT227 have bigger area, which attach to heat sink.... to solve this problem , i will use best isolators (ceramic), and i believe i don't have problems with Heat taking... datasheet
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
wrote ...
i will use best isolators (ceramic), and i believe i don't have problems with Heat taking...
You don't want to use something like that. You need something which will conform to the irregularities of the heatsink and back of the device. Something like a soft sil-pad or phase change material works well. Thermal grease would probably work okay too, but its not isolating.
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