LM2904B-Q1: maximum current of internal ESD diodes in unpowered mode

Michael Daimer

Intellectual 1195 points

Part Number: LM2904B-Q1
Other Parts Discussed in Thread: LM2904-N, LM2904, LM2904B

Hi team,

I have a question on the maximum allowed current through the internal ESD diode structure, in case the IC is unpowered?

Thanks and best regards,

Michael

7 months ago

0 Clemens Ladisch 7 months ago

Guru 271300 points

The datasheet of the LM2904-N (originally from National Semiconductor) specifies 50 mA.
The datasheet of the LM2904/LM2904B does not have this information. (An application note says that less than 1 mA prevents phase inversion.)

Please note that this device has overvoltage-tolerant inputs, so a current flows only for voltages below GND.

+1 Ron Michallick 7 months ago

TI__Guru*** 145766 points

Hello Michael,

No current will flow for positive input voltage. For negative input voltage, only -0.3V is allowed. No negative current is specified. It is very reasonable to assume -1mA is safe.

For output voltage, no unpowered current is specified. +/-1mA should not be harmful.

0 Michael Daimer 7 months ago in reply to Ron Michallick

TI__Intellectual 1195 points

Hello Ron, Clemens,

thanks for your feedback and the answers.

Best regards,

Michael

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LM2904B-Q1: maximum current of internal ESD diodes in unpowered mode