Alternative for TIP120 and IRF9Z24N

Forums Forum Alternative for TIP120 and IRF9Z24N

This topic contains 3 replies, has 2 voices, and was last updated by  Martyn 1 year, 6 months ago.

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  • #1945 Reply

    techcoze

    TIP120 is not available in local stores, instead i found TIP122. On other forums i read that this alternative can work by changing resistor value. Can you please confirm if I can ise TIP122 and what changes i will have to do in circuit diagram?

    Also IRF9Z24N is not available in local stores, what alternative can i use for same?

    #1947 Reply

    Martyn
    Keymaster

    TIP122’s can be used and can be used with the same resistor or a smaller one to get better saturation (150 – 180 ohm).

    I’m not at home and don’t have the information on the IRF9Z24N with me, but this was chosen primarily due to the low RDS(on) value. The requirements are not too great, P-channel, 5V, and low amps. So any similar mosfet will be suitable.

    It should be noted that I include the IRF9Z24N as a why to prevent reverse voltage which I think is a problem due to using Nano clones (I buy the very cheapest possible). You can also use a diode like a 1N4001 but this has a higher voltage drop of about 0.7v – 1.0v.

    • This reply was modified 1 year, 6 months ago by  Martyn.
    • This reply was modified 1 year, 6 months ago by  Martyn.
    #1950 Reply

    techcoze

    Thanks for quick reply, Till i get correct mosfet, what if i don’t add mosfet / diode for the moment, and take care to not connect external power supply when USB is connected (and vice versa). So can I skip mosfet / diode if such precaution is taken?

    #1951 Reply

    Martyn
    Keymaster

    That’s fine.

    Although not in time to help you, I will try to put together a list of alternative components. The next iteration of the dropController is likely to use mosfets rather than TIPs. I really only used TIPs because I had a lot of them.

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