Author Topic: TO247 mounting  (Read 1278 times)

Offline Mathieu thm

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TO247 mounting
« on: September 18, 2022, 06:32:10 PM »
Hello, I will show you a tip to mount IGBTs in TO247 package to perform better heat dissipation.

If the IGBT mounting screw is used with an insulating pad, the IGBT may crush the pad at the screw and lift the other side of the IGBT (where there is the die), and the heat transfer is not good.
The main idea is to apply pressure just above the IGBT die for better heat dissipation.

I made metal tabs from this piece of metal, the next pictures are enough to understand without comment :














« Last Edit: September 18, 2022, 06:38:22 PM by mthome4 »

Offline Weston

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Re: TO247 mounting
« Reply #1 on: September 19, 2022, 09:58:56 PM »
Looks like a cool idea! I have seen some similar clips in commercial products.

One thing I would be worried about is the compliance of the strap you are using, if its not springy it might just deform under load and not have much clamping force, especially after a few thermal cycles. A spring washer might help.

Luckily it does not require too much clamping force, it just has to be in the right place. A M3 screw tightened to the suggested torque provides ~200+ PSI of force on the area of the thermal pad and can warp the package, as you mentioned. But you really only need 25 - 50PSI on most thermal pads to get the minimum thermal resistance.

Offline davekni

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Re: TO247 mounting
« Reply #2 on: September 20, 2022, 05:15:35 AM »
Quote
Looks like a cool idea! I have seen some similar clips in commercial products.

One thing I would be worried about is the compliance of the strap you are using, if its not springy it might just deform under load and not have much clamping force, especially after a few thermal cycles. A spring washer might help.
Yes, nice implementation.  Much better than just a screw for mounting even without much springiness.  A spring washer under the screw head is a great addition.

A commercial version of a spring clip like this is MAX08NG as mentioned in this post:
    https://highvoltageforum.net/index.php?topic=2786.msg20050#msg20050
MAX08NG clips are available from normal electronics distribution and other outlets.
« Last Edit: February 04, 2024, 09:24:00 PM by davekni »
David Knierim

High Voltage Forum

Re: TO247 mounting
« Reply #2 on: September 20, 2022, 05:15:35 AM »

 


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