TPD6E001: Continuous current rating of diodes to positive supply

Chris Belting

Part Number: TPD6E001

Tool/software:

What is the continuous current rating for the diodes between the input signal and the supply rail for the TPD6E001?

For context, when using the TPD6E001 for ESD protection of an RS-422 receiver, there is a possibility a remote driver could be powered when the receiver is not. In this scenario the high-side ESD diode allows the power rail of the receiver to be back-powered, and the remote RS-422 driver will source the current.

For this condition a return or reference connection exists between the driver and receiver in the form of cable shields where local references (GNDs) are connected to the shielded enclosures. For cabling not exceeding 40 feet, the common reference potential suggests minimal common mode voltage between the driver and receiver.

While the usage of the TPD6E001 in this application is questionable, and possibly not recommended, knowing the permissible continuous current is needed.

5 months ago

0 McKenzie Eaker 5 months ago

TI__Expert 8120 points

Hi Chris,

For TPD6E001, the leakage current during normal operation is roughly 1nA and the supply current is max of 100nA.

Best,

McKenzie

0 Chris Belting 5 months ago in reply to McKenzie Eaker

Prodigy 60 points

Sorry McKenzie, the question was not regarding leakage current during normal operation, but the forward current through the high-side diodes during an abnormal condition.

Again, I'm hoping to quantify an acceptable continuous forward current through those diodes - this is not something found on the datasheet, nor is it a condition the part would see if the protected inputs were powered and the Vcc pin had 3.3V to 5V on it with respect to the GND pin. For the abnormal condition of interest, the Vcc pin can be considered connected to GND. Apologies this was not stated more clearly.

0 McKenzie Eaker 5 months ago in reply to Chris Belting

TI__Expert 8120 points

Hi Chris,

Sorry for the misunderstanding. This is an older device in our portfolio, so I don't have much additional data but looking at the test condition for our forward voltage, I would assume the max forward current would be 10mA.

I will reach out to our Design team in India to verify this and see if they have additional information. I will reach back out once I have an answer.

Best,

McKenzie

0 Chris Belting 5 months ago in reply to McKenzie Eaker

Prodigy 60 points

Thanks McKenzie, I appreciate your effort and look forward to hearing their thoughts.

+1 McKenzie Eaker 5 months ago in reply to Chris Belting

TI__Expert 8120 points

Hi Chris,

I was told the max DC forward current through the device during an abnormal condition would be 100-200mA depending on the size of the device.

Best,

McKenzie

0 Chris Belting 5 months ago in reply to McKenzie Eaker

Prodigy 60 points

Thanks so much McKenzie - this is very helpful.

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TPD6E001: Continuous current rating of diodes to positive supply