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USB2ANY: Support temperature

Part Number: USB2ANY

Hi team,

My customer is going to use USB2ANY for their prototype evaluation. The expected ambient temperature is -40 to 85c.

Is it okay that they put their prototype together with USB2ANY in the oven?

Regards,

  • Hi ,

    I have a feeling that the plastic casing in USB2ANY may not be able to survive 85C in an oven. It may distort its shape if the part is soaked at 85C for too long. 

    In the situation like this, I tend to use longer flexible (smaller diameter one, if you are able to find), and pass through a side of door or other available port passage in an oven or the chamber. If it is not doable, I would convert the USB cable in flat ribbon type and pass it out of the door's edges of a testing chamber. Typically, these chamber has silicon rubber gasket sealed at the perimeters of door. 

    If you need further assistant, please let us know. 

    Best,

    Raymond

  • Raymond-san,

    Thank you for your reply.

    I think the plastic casing can be removed easily. Do you think they can put the bare PCB of USB2ANY in the oven?

    Regards,

  • Hi -san,

    That should work as well.

    Please make sure that the bare PCB is not going to be in contact with metal shelves in the chamber or placed the PCB on a piece of electrical insulator (wood,  plastic board etc.). Tie it down with zip tie, since the PCB may move around inside of chamber due to air flow. Some of larger ovens have very strong circulating air flow in order to maintain temperature uniformity inside of a chamber. 

    Best,

    Raymond 

  • Hi Atsushi,

    the PCB and all the components on it should easily withstand 85°C, with the exception of C13. Try to exchange C13 with a 105°C or 125°C variant. You can also mount a X7R. But add a series resistor of 1R or so.

    Having said this, many ovens have a large "tidal" range (large temperature fluctuations when controlling the temperature). Here again C13 is in danger and all components which are only rated for 85°C maximum temperature. The maximum temperature of FR4-PCB is about 100°C which should not be exceeded for more than a few minutes. Otherwise the solder joints begin to oxidize and become grey. The vias of PCB begin to suffer as well. So you risk a severe damage at temperatures well above 85°C for longer perdiods :-(

    Kai

  • Hi Kai,

    Do you know the part number and temperature ratings of the 30 pin cable that comes with the USB2ANY?

    Thanks,

    David

  • Hi David,

    The cable shown below is a standard 0.1" pitch, 1 to 1 ribbon cable. Any electronic grade flat ribbon cable is rated up to 85C in temperature. There are some teflon and high temperature rated ribbon cable  as well. You may either buy the ribbon cable and crimp it yourself or buy it already made cable from store, such as amazon, mouser, digikey etc. The cable enclosed in the adapter is 6" in length, and can be found on p.15 of the user guide. 

    https://www.ti.com/lit/ug/snau228/snau228.pdf?ts=1594738053894&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FUSB2ANY

    If you have the connector and ribbon cables more than 30 pins, then you should be able to make it yourself. If you make it yourself, pay attention to pin 1 and red line of the ribbon cable and connector. Enclosed is a link from Amazon, if you want to purchase it directly.  

    https://www.amazon.com/Sydien-2-54mm-Connector-Rainbow-Ribbon/dp/B07Q2SGFWM/ref=sr_1_1?dchild=1&keywords=30+pin+ribbon+cable&qid=1594738316&sr=8-1

    Best,

    Raymond

  • Hi David,

    We haven't heard from you in a while. We hope the issue was resolved. I am going to close thing thread now, please reply to reopen if you have any additional questions / information.