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SN65HVDA1040A-Q1 - IEC Standards

R11
Expert 1485 points
Other Parts Discussed in Thread: SN65HVDA1040A-Q1, SN65HVD255

Would the transceiver be capable of passing the following or would additional external clamping be required?  If external clamping is required, what is the internal clamping level of the SN65HVDA1040A-Q1?

  1. IEC61000-4-4 (Burst)

                                                               i.      Burst on Signal Ports (Line to Earth Capacitive Clamp)…+/- 1kV 5/50 Tr/Th ns, 5KHz repetition

  1. IEC61000-4-5 (Surge)

                                                               i.      Surge on I/O Ports (Line to Earth)…+/- 1kV

  • 0
    TI__Mastermind 20590 points

    Hi Rustin,

    The SN65HVDx1040x devices are specified as a -27V to +40V absolute maximum device. The actual clamping voltage levels of the integrated protection of the device are not published but are set with margin to guarantee the -27V to +40V required by the datasheet and the ISO11898-2 and -5 CAN standards.  We have customer systems passing well both the IEC61k-4 and -5 tests using these devices with external protection TVS diodes.  The TVS diodes should be chosen to clamp hard with as low of a voltage as is possible in your system with a balance of the working DC voltage you may need.  For example with a 12V power supply the SM712 or MMBZ12 or MMBZ15 type TVS may work quite well.  NUP2105 or MMBZ27 is another choice if you may need to have 24V DC.  There are equivalent varistors from TDK and others that could also be use. 

    There are newer generation devices that have state of the art ESD and transient protect:  SN65HVD255/6/7 and HVDA551/3-Q1 that are designed to work to the next level with external TVS solutions for system level IEC tests like Burst and Surge.

    -- Scott