Announcement

Collapse
No announcement yet.

AON7403 Mosfet Equivalent

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    AON7403 Mosfet Equivalent

    Hellow guys,

    I am trying to replace an AON7403 Mosfet but i dot not have in my stock the same. So i wonder if there is any equivalent to this Mosfet.

    Thank you very much.
    Tags: None
    #2
    Very common to replace. Almost all motherboards feature 2 x DCin mosfets which are N-channel; 30v rated mosfets if the motherboard is fitted with the BQ charger IC (Texas Instruments). Hunt for them on your donor boards. If the part fits physically, check to be sure they are indeed N-channel type and you should be fine to use as a replacement for the above. If purchasing new, consider the relatively higher grade parts from Texas Instruments with the very low Rds on resistance which means higher current can be passed through the devices.

    Comment

      #3
      According to its Datasheet its P-Channel 30 V. This is the second mosfet in the DC-In Section . The First is a 7401. So if i can not find 7403, i DO have 7401 to replace! Think it will work?

      Comment

        #4
        My bad, N-channel is far more common than P-channel mosfets. Have you confirmed that the 7403 mosfet is defective?

        Test it as follows - remove all power. Meter in resistance mode.

        Measure the resistance across the mosfet legs:

        source (1-2-3) & drain (5-6-7-8)
        source (1-2-3) & gate (4)
        gate (4) & drain (5-6-7-8)

        Post each measurement. If the meter reports 'OL' = over limit, switch to a higher scale of resistance. Each measurement should be hundreds of K ohms or higher. If not is not, flux and remove the part - with care. Then allow the part to cool down on our work bench and measure it again while the part is off the logic board. If the measurements remain low, the part is defective.

        Comment

          #5
          Hellow, i did all the measurements. On-Board -> Source to Drain 25.2 K Ohms
          Gate to Source -> 5 M Ohms
          Gate to Dain --> 6 M Ohms
          Outside of the board all measurements are on the Scale of M Ohms,

          So i guess its not the Mosfet, I also replace it with a 7401 P - Channel same results.

          Anyway now with the thermal cam seems to have problem the 3-5 V power supply. Rabit Hole i guess.

          Thank you very much for your help.

          Comment

          Previous template Next
          Working...