TPD4E1U06: ESD Protection for MIDI

Hideki Hayashi1

Genius 9330 points

Part Number: TPD4E1U06
Other Parts Discussed in Thread: ESD122, TPD2E2U06

Hi team,

I'm looking for ESD protection for MIDI port. Is TPD4E1U06 suitable for this use-case?

You can refer https://mitxela.com/other/ca33.pdf for understanding MIDI standard.

Regards,
Hideki

over 4 years ago

0 Matt Smith over 4 years ago

TI__Genius 13046 points

Hi Hideki,

Are you using the 5 V or 3.3 V signaling? Also, are you protecting just one MIDI port? If so, you wouldn't need a 4 channel device like TPD4E1U06 since there's only 2 pins that need protection.

Regards,

Matt Smith

0 Hideki Hayashi1 over 4 years ago in reply to Matt Smith

TI__Genius 9330 points

Hi Matt,

There are 2 MIDI port, one is MIDI OUT another is MIDI IN. So, If I understand correctly, 4 channel device (2 channel *2) is good selection. But I don't know which bi-directional and uni-directional are better.

Regarding the signal voltage, I didn't know which. If it is 3.3V, customer can choose lower Vrwm devices, correct?

I forgot to attach what kind of EE. https://www.ti.com/solution/piano-keyboard-synthesizer

Regards,

Hideki

+1 Matt Smith over 4 years ago in reply to Hideki Hayashi1

TI__Genius 13046 points

Hi Hideki,

I would still go with a 2 channel device and put one on each MIDI port. It looks like the ports are on different sides of the board. This will cause high parasitic inductance if the traces are too long connecting the ports to the ESD device. You can read more about this here: https://www.ti.com/lit/an/slvaex9/slvaex9.pdf?ts=1624458902636&ref_url=https%253A%252F%252Fwww.ti.com%252Finterface%252Fcircuit-protection%252Fesd-protection-and-tvs-surge-diodes%252Ftechnical-documents.html

Unidirectional devices usually offer better clamping if the signal does not go below ground during normal operation which seems to be the case for this application. However, we do have bidirectional diodes that might offer better specs than some unidirectional diodes like higher IEC 61000-4-2 rating or lower capacitance.

You are correct on the Vrwm statement. You want the Vrwm of the ESD device to be as close to the normal operating voltage levels as possible.

If you are using the 3.3 V signaling, I would recommend ESD122, and for the 5 V signaling, I would recommend TPD2E2U06.

Let me know if you have any more questions on this.

Regards,

Matt Smith

0 Hideki Hayashi1 over 4 years ago in reply to Matt Smith

TI__Genius 9330 points

Hi Matt,

I greatly appreciated your explanation and the attached document. Thank you.

Regards,

Hideki

Interface

Interface forum

TPD4E1U06: ESD Protection for MIDI