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TVS3300: good choice for protecting 28V/20A (6S LiPo) input?

Thomas Bewley
Expert 1030 points
Part Number: TVS3300
Other Parts Discussed in Thread: CSD18510Q5B, LM74700-Q1, , TVS3301

I am planning on using a TI LM74700-Q1 ideal diode controller to control a TI CSD18510Q5B power MOSFET to protect a PCB with up to 28V input, at up to 15A continuous, 20A peak (or thereabouts...).  The power source will typically be 6S LiPos with high C ratings, so they can deliver quite a jolt.

Reading the TI LM74700-Q1 datasheet, it seems the Littelfuse SMBJ33CA is an appropriate TVS diode to protect this PCB against power surges in the above-described system.

Is the TI TVS3300 an adequate substitute for the Littelfuse SMBJ33CA for such an application?  Any benefits or concerns with this choice?  The DSBGA version is adorably compact...

  • 0
    TI__Genius 13760 points

    Hi Thomas,

    Welcome to E2E!

    The TVS3300 is a unidirectional device, so I would position the TVS3301 which is bidirectional like the SMBJ33CA.

    A major difference is that the TVS3301 surge capabilities is specified according to both the IEC 61643-321 and IEC 61000-4-5 standards while the SMBJ33CA is only specified against the IEC 61643-321. Each standard offers protection to a different pulse. In some cases the end product will have a required standard that must be meet between the ones previously mentioned or will pick the one that best matches the measured fault conditions.

    In the datasheet of the LM74700-Q1 they tested the SMBJ33CA against a different set of standards (ISO) for automotive applications. The TVS3301 was not tested against this standard. If your application resembles the application described in the datasheet I would not recommended substituting the TVS diodes tested for the TVS3301. For your application you would have to pick the TVS device that specifies according to the standard that best matches your fault condition, or that has been tested like in the datasheet.

    Best regards,

    Andy Robles

  • 0 in reply to Andy Robles
    Expert 1030 points

    Thanks Andy!  I clearly still have much to learn about my anticipated fault condition(s), and the set of ISO standards that might be expected for my application areas...  cheers - Tom