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Thread: Teensy 4.1 replacement Capacitor?

  1. #1

    Teensy 4.1 replacement Capacitor?


    I have a teensy 4.1 that was dead on arrival, I noticed a capacitor seems broken so will try to replace it.
    But I need to figure out the value, its the one closest to the usb plug on the bottom, see pictures below
    Any hint to the part number or capacitance value and package of this one? Thanks!

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  2. #2
    Senior Member+ defragster's Avatar
    Join Date
    Feb 2015
    See Component Locations here :

    Looks like C27

    2.2 uF on schematic

  3. #3
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    That looks like C27. Scroll to the bottom of the Teensy 4.1 page the schematic and parts placement diagrams.

  4. #4
    Oups missed that doc thanks! and is the package 0603?
    Would this be a critical component that if broken would explain that the teensy is dead? or is it a non critical decoupling cap?

  5. #5
    Senior Member
    Join Date
    Jul 2020
    Probably still has most of its capacitance - unless its actually shorted I'd leave it as is. These caps
    are a stack of parallel plates, losing some of the plates just reduces the capacitance. Ceramic fractures
    tend to be very clean so I suspect its not shorting - but measure it to be sure!

  6. #6
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    Yes, 0603 size.

    It's only a decoupling capacitor for the USB voltage. The board should probably still work without it, especially if used with a short USB cable.

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