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USB TYPE C VBUS Protection

Shmuel Davis
Expert 2920 points
Other Parts Discussed in Thread: TPD6S300, TPD2S300, TPD8S300, HD3SS3220, TPD4EUSB30, TPD2EUSB30, TPD4E02B04-Q1, TPD4E05U06-Q1

What type of protection on the VBUS do you recommend for the USB (3.0/3.1/3.2) Type C connector ? 

In previous USB 2.0 Designs we have used a Littlefuse PGB1010603 PULSE-GUARD® ESD Suppressors

We are using both the TI TPD6S300 and TI TPD2S300 to protect the other USB Type C signals ! 

  • 0
    TI__Genius 10370 points

    Hi Shmuel,

    I believe the question you're asking was answered in a previous thread, which can be found here: https://e2e.ti.com/support/interface/circuit-protection/f/389/t/650941. 

    I recommend placing high-speed ESD diodes (TPD1E5B04DPYR) on each USB3.1 channels. Feel free to look at one of our PD controller EVM schematic, such as the TPS65981-EVM. Page 23 of the user's guide shows the connection of these ESD diodes on the Type-C connector (look below):

    It's also recommended to place a Schottky diode and a 0.1uF cap on each VBUS channel.

    Lastly, I don't beleive you need both the TPD6s300 and TPD2s300. You would need just one of these protection devices per Type-C port.

    TPD2s300: CCx protection

    TPD6s300: CCx, SBUx, and one USB2.0 channel protection

    TPD8s300: CCx, SBUx, and both USB2.0 channel protection

    If this answers your question, PLEASE select  This resolved my issue 

  • 0 in reply to Aramis P. Alvarez
    Expert 2920 points

    Dear Aramis,

    Thank you so much for this reply, it has helped me a lot in getting a better understanding of the circuit protection requirements. I am now looking at the schematic of the TPS65981-EVM and seeing there is a lot more protection on that board that what I have planned ! 

    Firstly we are NOT going to be using \ designing USB PD. To get enough power we have planned to use 2 Type C connectors one for Communication and power and the 2nd connector solely for additional power. This explains why we are using both the  the TPD6s300 and TPD2s300. 

    1. I see that there are Schottky diodes D4-D10, & D12 on the Tx\Rx lines ! For my non-PD design is this required \ recommended ?

    2. In the HD3SS3220 data sheet they mention using "the TI TPD4EUSB30 can be combined with the TI TPD2EUSB30 to provide flow-through ESD protection for both USB2 and USB3 differential signals". (This probably answers my above question ?) WHen I looked at these data sheets they are for USB 3.0 as expected. Would it be better to use a similar device but that give protection for USB 3.1 since we might go to that in the future ? Thus we will only need to stock 1 device if it is compatible with both 3.0 & 3.1 ?! What do you recommend ? Would, lets say TPD4E02B04-Q1 be a better choice ?

    3. We will be using the FTDI FT601 chip to do the interfacing to the USB 3.0 bus. In our previous USB 2.0 design FTDI recommended also PulseGuard ESD Suppressors - PGB1010603 on the USB 2.0 DP/DM signals as well as 10pF Caps to GND. When I asked them about this requirement for this design using the FT601 they claimed that it was necessary as a different PHY is being used. When I looked at the data sheet for the FT601 ESD and Latch-up Specifications :-

    Human Body Mode (HBM)  - JEDEC EIA/JESD22- A114-B, Class 2 - ±2kV 

    Machine mode (MM) - JEDEC EIA/JESD22- A115-A, Class B - ±200V

    Charged Device Mode (CDM) - JEDEC EIA/ JESD22-C101- D, Class-III - ±500V

    Latch-up JESD78, Trigger Class-II - ±200mA

    In your opinion is this enough ? In the TPD4E02B04-Q1 data sheet they recommend on the USB 2.0 lines to use TPD4E05U06-Q1 ? What do you think ?

  • 0 in reply to Shmuel Davis
    TI__Genius 10370 points
    Hi Shmuel,

    I'm always happy to help. The ESD diodes are recommended on the USB 3.1 (USB 3.0, 3.1, and 3.2 are all the same channels and pins on the type-c connector) channels. This will protect these pins from any ESD events. The reason I showed the TPS65981-EVM was to show our protection on the Type-C connector (you can disregard the PD controller design for your application).

    For the TPD4/2EUUSB30 device, could you please re-post your question with that part number in the subject heading, so that this question is routed to the appropriate forum and expert engineers? Thanks in advance :-)