OPA828: Electrostatic discharge

Shotaro Sakai

Part Number: OPA828
Other Parts Discussed in Thread: OPA192,

Tool/software:

Hello team,

My customer is evaluating OPA828. The electrostatic discharge of OP828 is ±2000V. But some opamp (ex OPA192) cases are ±4000V.

Is this due to the difference in protection circuits inside opamp?
Can we improve ESD immunity by external components?

Best regards,

Shotaro

10 days ago

0 Clemens Ladisch 10 days ago

Guru 283330 points

1. Yes.

2. Yes.

In general, built-in ESD protection is designed only for ESD events that happen during automated manufacturing, and for applications where the signals can be touched by a human or are (un)plugged, you need additional protection.

0 Shotaro Sakai 10 days ago in reply to Clemens Ladisch

TI__Intellectual 2930 points

What is a recommended circuit to reproduce good ESD immunity?

0 Clemens Ladisch 9 days ago in reply to Shotaro Sakai

Guru 283330 points

That depends on how much ESD you expect (in the test or for real), and how much capacitance/resistance you can afford on the signal line.

0 Art Kay 9 days ago in reply to Shotaro Sakai

TI__Mastermind 22017 points

Shotaro,

I agree with Clemens. Thanks to his excellent comments and support.

Here are some discrete ESD protection devices: https://www.ti.com/passive-discrete/diodes/esd-protection-diodes/products.html

Here are some TVS (transient voltage suppressor diodes): https://www.ti.com/passive-discrete/diodes/tvs-diodes/products.html

Both can be effective against ESD however TVS diodes are designed to help protect against a wide range of different overstress events, but ESD protection diodes are more limited to ESD protection only.

Normally this kind of protection also includes a series resistor to limit current under fault conditions. Op amp precision labs covers input protection under the ESD and EOS sections.

best regards, Art

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OPA828: Electrostatic discharge