INA240-Q1: INA240-Q1 Max Common mode voltage clamped?

Vitaliy Mosesov

Part Number: INA240-Q1

The in the absolute value table in the datasheet, this IC is capable of handling -6V, and +90V steady state common mode voltage. We have a test condition where the ~200 microsecond transient will reach -9.1V and I’d like to understand the effect on this IC. Are there diode clamps inside the IC for -6V and +90V? Thank you

over 4 years ago

0 Guang Zhou over 4 years ago

TI__Mastermind 27590 points

Hi,

You’re correct, the diode clamps restrict the input common mode range: -6V to +90V.

Regards, Guang

0 Vitaliy Mosesov over 4 years ago in reply to Guang Zhou

Prodigy 110 points

Thank you for your reply. If the transient pulse (~200 micro sec) will reach -9.1V (-3.1V below -6V), in your opinion

will this IC survive? I now there's no guarantee and understand this will exceed absolute rating.

I believe these ICs have internal 3k resistors at the input pins possibly limiting the transient current.

0 Guang Zhou over 4 years ago in reply to Vitaliy Mosesov

TI__Mastermind 27590 points

Hi,

Internal to the device, there are no current limiting resistors. The 3K you mentioned are not in the path of ESD diodes. Between the -9.1V external voltage and ground are the ESD diode and parasitic trace resistance only.

200uS is a long time; probably enough to cause damage to the device even if this is a one-time occurrence.

Regards, Guang

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INA240-Q1: INA240-Q1 Max Common mode voltage clamped?