max232 getting damaged frequently

[m2babaey]

Hi
In my experience, max232 gets damaged frequently. It works, but after a few days it may get damaged
I have tried using original products, but it hasn't helped yet
This is the schematic we usually use:


What is your experience?
Any suggestions?

 

[nitishn5]

I've not had such a situation.

What are your operating conditions?

 

[m2babaey]

Normal conditions, at home
I control it with atmega128 and connect it to computer using a usb2serial converter (FAT232)

 

[alexan_e]

Why do you use higher capacitor values than the ones suggested in the datasheet?
Maybe they stress the chip and they are the cause of fail.

 

[nitishn5]

Higher value caps can be a problem.
Larger caps means a larger switching current to charge and discharge the caps.
The caps in the max232 are for the charge pump for changing the voltage levels. This involves fast switching.

 

[udhay_cit]

1.Use capacitor 10uF or below.
2.Check the part from supplier original...

 

[m2babaey]

I reviewed the datasheet again, it seems 1uF should be used
I don't know why I had seen 10-22uF suggestions elsewhere
Thanks

 

[klystron]

Give more detail on the atmega128 and interfaces to the micro-processor. How long is the RS232 cable?

 

[m2babaey]

Give more detail on the atmega128 and interfaces to the micro-processor. How long is the RS232 cable?

Not long, maybe 1 meter
I think using smaller capacitors will fix my problem. Thanks all