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SN75240: PCN regarding rev.I

Daisuke Higa
Genius 3475 points
Part Number: SN75240
Other Parts Discussed in Thread: SN65220, , SN65240

Hi support team.

I have received the following inquiries from my customers who are already using this device in mass production.

1. In DESCRIPTION (page1), it changed as follows.
I would like to know when and why the change was made.
Rev.F
The SN65220 is a single transient voltage suppressor and
the SN65240 and SN75240 are dual transient voltage
suppressors designed to provide electrical noise transient
protection to Universal Serial Bus (USB) 1.1 ports.

Rev.I
The SN65220 device is a dual, and the SN65240
and SN75240 devices are quadruple, unidirectional
transient voltage suppressors (TVS). These devices
provide electrical noise transient protection to
Universal Serial Bus (USB) low and full-speed ports.


2. In ABSOLUTE MAXIMUM RATING
Rev.F has a description of Continuous power dissipation,
It is no longer Rev.I.
Could you tell me the reason for this?

Thank you for your cooperation.

Best regards

Higa

  • +1
    Guru 243220 points

    As shown in section 9.2, there are two or four TVS diodes. The devices have never changed; the description in the datasheet was corrected.

    The table in section 5 still has the 'wrong' description. The schematic on page 1 of the rev. F datasheet shows that one suppressor corresponds to two TVS diodes. (Apparently, one suppressor was meant to handle one USB port with two signals.)

    Specifying the continuous power dissipation is pointless because the devices do not dissipate any noteworthy amount of power during normal operation, and transient voltages are not continuous.

  • +1 in reply to Clemens Ladisch
    TI__Expert 8471 points

    Hi Higa and Clemens,

    Clemens is correct. The description was corrected but the table in section 5 was not. Thank you for pointing this out. It has been noted and will be corrected. The power dissipation comment is also accurate. These devices are meant to be transient suppressors, not continuous voltage clamps.  

    Regards,

    Matt Smith 

  • 0 in reply to Matt Smith3
    Genius 3475 points

    Hi Clemens-san Matt-san

    Thank you for your help.

    Best regards,

    Higa