mosfet compatibility

Thread Starter

brad20

Joined Apr 7, 2013
12
Can you mix 200v 50a with 200v 69a, 250v 62a rated nch mosfets in a power inverter's output section either modified or pure sine?
 

wayneh

Joined Sep 9, 2010
17,496
Each MOSFET needs to meet (and exceed) the minimum specs needed for its application. A MOSFET will work fine under milder conditions as long as it is not damaged by excessive voltage or current. So if it's rated to 200V but only sees 50V, that is no problem.

So without more information, the short answer is yes, mixing is not per se a problem.
 

bertus

Joined Apr 5, 2008
22,270
Hello,

There are more specifications needed to select a mosfet.
You have the Rds, the Vgs (gate threshold), the gate capacitance that can be different for the mosfets.

Bertus
 

wayneh

Joined Sep 9, 2010
17,496
Agreed. I didn't mean to imply my example specifications were the only ones you need to look at. We just cannot tell what's important without a lot more detail.
 

Thread Starter

brad20

Joined Apr 7, 2013
12
The output section is using a 250v capacitor. Would that mean It would have to be a 250v mosfet or could it use a 200v rated mosfet FDA70n20 or fdL100n50 orig mosfets used are irfp264n 250v 44a mosfet.
 
Last edited:

Thread Starter

brad20

Joined Apr 7, 2013
12
The output section is using a 250v capacitor. Would that mean It would have to be a 250v mosfet or could it use a 200v rated mosfet FDA70n20 or fdL100n50 orig mosfets used are irfp264n 250v 44a mosfet.

irfb264n
250V
Current - Continuous Drain (Id) @ 25°C 44A (Tc)
Rds On (Max) @ Id, Vgs 60 mOhm @ 25A, 10V
Vgs(th) (Max) @ Id 4V @ 250µA
Gate Charge (Qg) @ Vgs 210nC @ 10V
Input Capacitance (Ciss) @ Vds 3860pF @ 25V
Power - Max 380W
200V

fda70n20
200v
Current - Continuous Drain (Id) @ 25°C 70A (Tc)
Rds On (Max) @ Id, Vgs 35 mOhm @ 35A, 10V
Vgs(th) (Max) @ Id 5V @ 250µA
Gate Charge (Qg) @ Vgs 86nC @ 10V
Input Capacitance (Ciss) @ Vds 3970pF @ 25V
Power - Max 417W

100n50
500V
Current - Continuous Drain (Id) @ 25°C 100A (Tc)
Rds On (Max) @ Id, Vgs 55 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id 5V @ 250µA
Gate Charge (Qg) @ Vgs 238nC @ 10V
Input Capacitance (Ciss) @ Vds 12000pF @ 25V
Power - Max 2500W
 

wayneh

Joined Sep 9, 2010
17,496
It's impossible to know for sure without more information. But to be safe without that information, anything less than 250V becomes a risk.
 
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