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SN754410: SN754410NE

ARUN S PANICKER
Prodigy 120 points
Part Number: SN754410

Dear Sir,

During lightning test Level-3 Waveform 3 and 4 pin injection test (both positive and negative pulse) our SN754410NE ic got damaged.
The schematic and datasheet for the same is attached herewith. During testing we have shorted chassis and analog ground.
We request you to please provide your technical assistance for the same.

Regards,
Arun PSN754410NE.pdfSN754410NE.pdf

  • 0
    TI__Guru** 114905 points

    Hi Arun,

    The SN754410 contain ESD protection for HBM, CDM and MM ESD events, but no other ESD events.

    Have you measured the voltages at pins 3 and 4 during the test? If the voltage exceeds the absolute maximum ratings, the device could be damaged.

  • 0 in reply to Rick Duncan
    Prodigy 120 points

    Dear Sir,

    We have to perform lightning test level-3 waveform 3 and waveform -4  as mentioned in RTCA-DO160F, section -22 as a part of Qualification test.

    During test we have measured voltages for waveform-3 ( +57.80V was a clamp voltage after TVS diode for positive test cycles and -38.10V for negative cycles) .

    The motor driver ic cant withstand more than 39V as mentioned in datasheet , we want to add protection circuit on all the four output channels.

    In view of the above we request you to please suggest the part which can be added in series or parallel to protect the device from lightning test.

    Rgds,

    Arun P

  • 0 in reply to ARUN S PANICKER
    TI__Guru** 114905 points

    Hi Arun,

    We do not provide guidance on how to protect the device from lightning. Most customers have much more experience protecting the system/device than we do.

    May I suggest working with a TVS manufacturer? Many can be found by searching "TVS diode manufacturers" online.

    In general, using a unidirectional TVS on each motor lead is a good starting point. Unidirectional should limit the negative voltage.