The ōpa 1642 o kono kairo ni saiyō shite iru. Motomoto wa OP 275 o tsukatte ita, saikin no rotto ni wa ōpa 1642 o saiyō shita. Onaji mono o 10 yunitto tsukutta ga, sonōchi 5 yunitto de ōpa 1642 ga koshō shita. Koshō jōtai o kakunin suruto 1 unit wa Pin 8 + sapurai to Pin 5 + INPUT to Pin 4 - sapurai no 3ttsu no pin ga ōpa 1642 no naibu de shōto shite shimatte ita. 4Tsu no yunitto wa Pin 8 + sapurai to Pin 5 + INPUT no 2tsu no pin no ma ga naibu de shōto shite shimatte ita. Motomoto no OP 275 de hako no yōna fuguai wa ichido mo hassei shite inai. LME 49720 ni okikaeta mono mo nan-dai ka aru ga, kore mo koshō shita keiken wanai. Ōpa 1642 no yunitto ni kagitte koshō ga okite iru no ka fushigidesu. Koshō no mekanizumu o shiritaidesu. Ōpa 1642 wa kono yōto ni wa muiteinai no ka? Ōpa 1642 o tsukau sai ni chūi surubeki ten ga arimasu ka? Pin 8 + sapurai to Pin 5 + INPUT no 2tsu no pin no ma ga naibu de shōto.
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 at 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?
