TVS diode for IC 5V protection

[aless2056]

Hello, guys I have a very simple circuit with a PIC16F628 connected directly to a digital potentiometer MAX5386. All powered by a 5V source through an LM7805.

Initially, I had a problem with the Max5386, which returned the resistance to the initial position, after I put a 100nF capacitor between Vcc and the IC's gnd, the problem resolved. But now after a few days on, the Max5389 always burns, I believe it is some transient in the power supply.

Can putting a TVS diode on can prevent this from happening?
Which TVS diode would be indicated?

 

[KlausST]

Hi,

show your schematic and a photo.

Klaus

 

[FvM]

Although a TVS diode can't guarantee a supply voltage below maximum rating of 6V, it will typically reduce the risk of overvoltage damage. Choose 5.6 V or even 5V TVS, the latter will already show some leakage at noominal supply voltage.

It's however not said that supply overvoltage is damaging your device, overvoltage at the analog terminals is possible as well.

 

[aless2056]

Although a TVS diode can't guarantee a supply voltage below maximum rating of 6V, it will typically reduce the risk of overvoltage damage. Choose 5.6 V or even 5V TVS, the latter will already show some leakage at noominal supply voltage.

It's however not said that supply overvoltage is damaging your device, overvoltage at the analog terminals is possible as well.

In case the Max5389 power supply is 5V, can a 1N5908 or a 1N6373 help me?

In the TVS datasheet, I don't know very well which values are important and when the TVS does the voltage clamping

--- Updated Oct 10, 2022 ---

What would be the TVS Diode options to protect the MAX5389 when it is powered by a 5V source?