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TCAN4550-Q1: TCAN4550-Q1 Mission profile

j s
Prodigy 20 points

Part Number: TCAN4550-Q1
Other Parts Discussed in Thread: TCAN4550

Hi TI Team,

we are interested into using the TCAN4550-Q1 in our application, but are a bit concerned, if the device would withstand required lifetime.

There are two possible mission profiles. Can you please check if TCAN4550-Q1 could withstand any of them? There is also an option, that we could shut-off the component at higher temperature.
Temperature in the following tables is expected on the housing of the component.

Component T [°C] Duration [h]
93 9600
100 16950
102 2100
104 750
140 600

Component T [°C] Duration [h]
75 10000
98 5000
107 3000
117 1400
129 500
138 100

BR,
John

  • 0
    TI__Guru 53535 points

    Hi John,

    TCAN4550 specifies an absolute maximum junction temperature of 150C. Because none of these profiles exceed this specification, I don't expect a shut-off device would experience significant lifetime degradation. When the device is operational and dissipating power as heat, its junction temperature may exceed this limit in the more extreme profiles. In such cases, if the device temperature exceeds the Tsdr temperature, it will automatically shut down to allow itself to cool. In this state, since the ambient temperature does not exceed the absolute maximum specification and the device will not be dissipating energy from operation, it should return below the max temperature to avoid any effect on device reliability. 

    I will note that most device parameters are characterised between -40C and 125C. So when operating at Ta above 125C, such as in these profiles, you may expect some device behaviors to drive outside of specified ranges. The most likely parameters to be effected are timing parameters, output voltages, and supply and leakage currents. 

    I hope you find this information helpful. Let me know if there are any other questions you or your team have.

    Regards,
    Eric Schott

  • 0 in reply to Eric Schott1
    Prodigy 20 points

    Hi Eric,

    thank you for your answer. But maybe more than just the temperature higher than 125°C, we are concerned about the life time itself, because the device is constantly on quite high temperature. And basic calculations for Grade1 device show that device will not withstand the mission profile. Can you provide your calculations for the profile that we provided and if you can share some MTBF calcualtions.

    Best regards,

    John

  • 0 in reply to j s
    TI__Guru 74302 points

    Hey John,

    We are looking into this with our quality team, thank you very much for your patience on this.

    Regards,

  • 0 in reply to Eric Hackett
    TI__Guru 74302 points

    John,

    This will be handled offline, so I'll be closing this thread and emailing you directly.

    Regards,