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Discussion in 'Electronic Basics' started by Ed, Dec 4, 2003.

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  1. Ed

    Ed Guest


    I need to use a 3.3V device with the 5V I2C bus. In the I2C
    specification it recommends using MOSFET's to do the level conversion.
    Can anyone recommend any MOSFET's to do it? I need to run at 400KHz.


  2. Your post is kind of terse but I assume you are trying to do level shifting
    like demonstrated in figure 2 of this document:

    If my assumption is true and you are trying to use this most crafty scheme
    (it makes use of the integral body diode of the MOSFET) then any small
    MOSFET with a low threshold voltage should work. Something like the BSS138
    for instance might be a good choice.
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