Hi, I want to use BTS50080 because it is rated at nominal current for 10A but it's not available (shortage).

I'm able to use BTS6143D but it's nominal current rating is 8A. Its short circuit current is much higher 20-60A at the voltage I will be using it, 12-24V, depending on temperature build up.

What is likely to happen if I go ahead and use BTS6143D at 10A? Do I just have to be careful about heat dissipation?

Datasheets
https://www.infineon.com/dgdl/Infin...N.pdf?fileId=5546d4625a888733015aa435f2d2115b
https://www.infineon.com/dgdl/Infin...N.pdf?fileId=5546d4625a888733015aa3da10821022

 

This seems to imply that given 6cm^2 of copper soldered to the tab a nominal current of 10A is available for BTS6143D?

Someone please help me understand what this means:



Is a junction temperature of 150 degrees expected or a worst case scenario? Why are there no graphs for a current to junction temperature relationship?

 

What is likely to happen if I go ahead and use BTS6143D at 10A? Do I just have to be careful about heat dissipation?

Yes, it would appear that it is the devices junction temperature from I²R heating, as determined by the ambient plus the heat sink temperature the device is mounted on (if any), that determines the maximum current.
How will the device be mounted?

And that's not just a power FET, it is an integrated switch containing a FET.

 

Yes, it would appear that it is the devices junction temperature from I²R heating, as determined by the ambient plus the heat sink temperature the device is mounted on (if any), that determines the maximum current.
How will the device be mounted?

And that's not just a power FET, it is an integrated switch containing a FET.

I was thinking just PCB with Vbb being carried by a large copper pour.

If the PCB traces are thick enough to carry the 10A is that fine or should I do something else to keep temp low at the chip?

 

I was thinking just PCB with Vbb being carried by a large copper pour.

If the PCB traces are thick enough to carry the 10A is that fine or should I do something else to keep temp low at the chip?

Depends upon how long the chip will be carrying the 10A and what the ambient temperature is.
If you put a copper pour under the chip with thermal grease that would help.
Search for PCB thermal resistance articles which should help you determine what you need to do.

 

Depends upon how long the chip will be carrying the 10A and what the ambient temperature is.
If you put a copper pour under the chip with thermal grease that would help.
Search for PCB thermal resistance articles which should help you determine what you need to do.

It's 25 degrees ambient.

I will be using thermal vias, copper pour and thermal grease then.

I noticed that Infineon doesn't have a recommended layout but on their website they list this chip as having a nominal current rating of 10A so I don't think there will be any problems.