Other Parts Discussed in Thread: STRIKE
The OPA 1642 is adopted for this circuit.
Originally we used OP 275, we adopted OPA 1642 for recent lot.
We made 10 units of the same, of which 5 units failed OPA 1642.
After confirming the fault condition
Three pins of Pin 8 + Supply, Pin 5 + INPUT, and Pin 4 - Supply were short-circuited inside the OPA 1642 in 1 unit.
Four units shorted internally between Pin 8 + Supply and Pin 5 + INPUT 2 pins.
In the original OP 275, such trouble has never occurred.
There are also some things replaced by LME 49720, but this has never been broken.
It is mysterious that a failure is occurring only in the unit of OPA 1642.
I want to know the mechanism of failure.
Is OPA 1642 not suitable for this use?
Is there anything to keep in mind when using OPA 1642?
