[About the opa445]

The datasheet lists their thermal resistance differences.
==> Thank you.

The temperature of the OPA445AP is quite high.

[About the opa445]

Dear all,



i have two questions about the OPA445.



First, about the "package-lead", there are 4 kind of the package,

"DIP-8", "SO-8 Surface-Mount", "SO-8 PowerPAD" and "TO-99 8-Pin".

What's the difference in the performance between these 4 kinds of the package?



The second question is, recently, I bought a OPA445AP to design a power amplifier.

The power amplifier is chose to be inverting power amplifier.

The input resistor and output resistor are 3M Ohm and 12M Ohm, so the gain is 12M/3M=4 if neglecting the minus sign.

According to the datasheet of OPA445, the supply voltages of OPA445 could as high as +/- 45V.

However, when applying +/- 40V, in addition to the output signal is disappeared from the oscillator scope, 

the temperature of the OPA445AP is quite high.

But, when applying +/-30V, the performance is quite well and the temperature is moderate.

So, what's the problem in the OPA445 or my circuit ?

Is anyone can help me?

Thank you very much.









Truman