Tool/software:
Hi,
The V+ (8pin) and V-(4pin) of the OPA2141AIDGKT were shorted.
The following condition occurs for a period of time. Is this the cause of the shorting? I would like to know the detailed reason why the shorting occurred.
■When the V+ (8pin) was +5 V and the V-(4pin) was floating, the DC component signal was input to ±Inx(2~3pin, 5~6pin) for a period of several 10 seconds to several minutes.
Best Regards,
Nishie
Hi Nishie,
■When the V+ (8pin) was +5 V and the V-(4pin) was floating, the DC component signal was input to ±Inx(2~3pin, 5~6pin) for a period of several 10 seconds to several minutes.
Yes, leaving the supply rails floating can cause the IC's internal damage or abnormal behaviors, including symptoms of resemble shorting.
The following image is the abs. max. ratings prescribed in OPA2141's op amp. If op amp's input voltage exceeds the following EIPD conditions consistently, and no current limiting resistor is implemented at the op amp's input, the input ESD protection diodes may conduct abnormally. Since both V+ and V- pins are floating, the ESD diodes may get damaged due to lack of returned path to GND inside of IC.
When ESD is damaged, it is typically failed in short, and it is possible that V+ and V- are shorted through the op amp's internal structure. This is considered as EIPD (Externally Induced Physical Damage) damage, which it includes EOS, ESD, Latch up related mechanism or events that caused it.
If you have other questions, please let us know.
Best,
Raymond
