Which MOSFET should I choose?

Discussion in 'The Projects Forum' started by varundua, Jun 23, 2015.

  1. varundua

    Thread Starter New Member

    Jun 15, 2015

    I have to choose an e-mosfet which acts a switch and is connected to an inductance coil which requires 900mA to charge. The coil is connected to the drain of the e-mosfet and a diode is connected parallel to the coil. The source is grounded and the gate gets an input from the output of IC555 timer of 12V.

    So which model of mosfet should I choose in this case?
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    Choose a FET with a low Rds(on) spec (e.g. less than 200mΩ), a power rating of several Watts and a Vds rating at least twice the coil supply voltage, in a case style you're comfortable with. The main vendors' web-sites have parametric search functions to help you choose.
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    IRF640 is a good N-fet