What is the optimal solution for mounting my IRFP240 transistors?
I have to drill the screws direct into the alloy.
My questions:
- Which screw (M3???, Lenght???)
- Do I need a washer???
- Which insulating (Kapton foil???)
- How much torque???
Any recommendations for a torque controlled screwer instrument? (GER: Drehmoment Schraubendreher)
Do I have to insulate the screw against the transistor??? (GER: Isolierhülse)
Links to vendors are highly appreciated!!!
Dirk
I have to drill the screws direct into the alloy.
My questions:
- Which screw (M3???, Lenght???)
- Do I need a washer???
- Which insulating (Kapton foil???)
- How much torque???
Any recommendations for a torque controlled screwer instrument? (GER: Drehmoment Schraubendreher)
Do I have to insulate the screw against the transistor??? (GER: Isolierhülse)
Links to vendors are highly appreciated!!!
Dirk
Hello,
optimal depends on the implementation. Kapton + goo is a good solution(but messy). Kerafol is also very good (see zoufang's posts).
M3 is correct and the length depends on the heatsink. You will need the depth of the tap (Gewindetiefe im KK) or just the Transistor+washer+Sink+washer+nut+~1mm for safty.
Torque... nach fest kommt ab 🙂 Therefore be careful but give it a good crunch.
No Isolierhülse for the TO247. The mounting hole is already isolated from the baseplate.
BTW: There is an auction for 33cmx100cm of 0,05mm Kapton foil on ebay Germany. (not related to me in any way, just found it the other day)
Best regards
Josch
optimal depends on the implementation. Kapton + goo is a good solution(but messy). Kerafol is also very good (see zoufang's posts).
M3 is correct and the length depends on the heatsink. You will need the depth of the tap (Gewindetiefe im KK) or just the Transistor+washer+Sink+washer+nut+~1mm for safty.
Torque... nach fest kommt ab 🙂 Therefore be careful but give it a good crunch.
No Isolierhülse for the TO247. The mounting hole is already isolated from the baseplate.
BTW: There is an auction for 33cmx100cm of 0,05mm Kapton foil on ebay Germany. (not related to me in any way, just found it the other day)
Best regards
Josch
There are heatsinks for transistors wich will be available in the German Conrad.
Example: Koelplaat SK 482 100 SA + 4x THFU 2 - Profiel-koellichamen - Conrad Electronic
Sometimes the torque can be found in datasheets but never overdo the screwing. You will feel when your screw is in place.
The lenght of the screwes depends, if you have a big heatsink they'll need to be longer, wich sound logical to me.
Good luck!
Example: Koelplaat SK 482 100 SA + 4x THFU 2 - Profiel-koellichamen - Conrad Electronic
Sometimes the torque can be found in datasheets but never overdo the screwing. You will feel when your screw is in place.
The lenght of the screwes depends, if you have a big heatsink they'll need to be longer, wich sound logical to me.
Good luck!
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