Replace IGBTs FF200R12KS4 with FF300R12KS

[Abdel_Rahman]

Hello
We have an Induction Heater has two IGBTS, one of them was defected (FF200R12KS4)... In our Stock there is (FF300R12KS4), an experienced Technician says it is alternative to the defected part, but there is some differences in the data sheet, can any one advice us for using it or not?
As my experience of electronics is not very good, What is the effect of these parameters?

Parameter : FF200R12KS4 , FF300R12KS
internal Gate Resistance : 2.5 , 1
gate Charge : 2.1 , 1.0
Input Capacitance : 13.0 , 20.0
Reverse Transfer capacitance : 0.9 , 1.4

 

[(*steve*)]

How fast (I.e. Frequency) are you switching the load?

 

[Sunnysky]

as @(*steve*) implied, switching speed or slew rate may be affected if driver does not have similar drop in resistor value to match drop in gate resistance. Most likely Ok. Thermal dynamics are unknown of complete circuit.

However output will have corresponding improved lower Rce at 200amps since it is rated for same voltage drop with 300A.

Switching speed can affect dynamic losses if not fast enough, but if fast enough, should run cooler. So complete design details are needed to confirm.

The fact that you stated that it is "defective" ( not defected from country ) implies the design may have overheated. So design details or operation history before/during failure are needed.

 

[Abdel_Rahman]

Thank you for your reply.

How fast (I.e. Frequency) are you switching the load?

As it is an old machine, It has not any manuals, but similar machine has frequency (30-100 kHz).

as @(*steve*)
The fact that you stated that it is "defective" ( not defected from country ) implies the design may have overheated. So design details or operation history before/during failure are needed.

I am sorry, It is defected, but my English is somewhat "defective"
It has been defected due to overloaded , after checking we found that there is a problem in the temperature sensor.

 

[Sunnysky]

It is worth trying and compare device temps to ensure operating <<=85'C

 

[Abdel_Rahman]

It is worth trying and compare device temps to ensure operating <<=85'C

But I am afraid of trying, May trying affect the module??

 

[Sunnysky]

it depends. if in doubt, get help.

 

[Abdel_Rahman]

it depends. if in doubt, get help.

What do you mean by getting help

 

[Sunnysky]

someone who knows how to replace correctly and test