How to select a mosfet for your design || N-MOSFET || IRF740

#mosfet #mosfetselection #choosemosfet
In this video mosfet selection is explained. After watching this video you will be able to select a mosfet for your design.
Thumb Rule in mosfet selection-
1. Vds - 1.5 to 2 times of rated Vds. Also check the de-rating curve of Vds vs temperature.
2. Id - Minimum 3 times of your rated drain current. Incase of higher ambient temperature lets say 85C/105C you must see the Id vs Temperature curve and if needed increase the Id to 5 times of rated drain current.
3. Vgs - Should be the value where Rds(on) is lower. Let say if lower mosfet Rds(on) is rated for 10V (Vgs) then bias your mosfet to operate the mosfet at Vgs = 10V in order to achieve the optimum thermal performance.
4. Vgs(th) is another parameter to decide the minimum ON voltage for mosfet based on your application.
4. Choose mosfet with lower Rds(on). Higher Rds(on) leads the higher temperature rise of mosfet.
5. Always look for mosfet switching characteristics e.g Gate charge, Input and output characteristics of mosfet. Lower input and output capacitor will give higher switching speed of the mosfet.
Input capacitor will help you in sizing the mosfet gate resistor.
6. Always look for safe operating curve(SOA) of mosfet for stability and avoid thermal runway of the mosfet.
7. Check mosfet power dissipation and verify if it meets your design requirement. It is recommended to de-rating curve of power dissipation with respect to ambient temperature.
8. Calculate the temperature rise of the mosfet above ambient. Thermal parameter of mosfet will help to calculate temperature rise in mosfet.
9. Check mosfet body diode characteristics per your current requirement.
This channel offers the mentorship program. Once you sign in for mentorship program you will get opportunity to interact with me directly for your Q&A through online consulting : 96$/month.
You can also schedule 1-1 meeting with me by paying just 19$/meeting.
Please do not raise access request if you have not joined LTspice Simulation Help Membership. The access of ltspice file will be given only to LTspice Simulation Help Members.
Link to Join LTspice Simulation Help Membership : / @electronicscircuithubech
Good Luck !

[@jimbossemi-customs3129]

You are very good at explaining, subscribed and bell on!

[@ElectronicsCircuitHubECH]

Welcome onboard , it would really helpful if you think of supporting by being a member our this community.

[@preetitiwari9765]

Good Job, keep it up.

[@ElectronicsCircuitHubECH]

Thank you, I will

[@electrowashyelect9715]

What about using to drive an inductive load . Max value of vds how does this affect the negative voltage from the back emf

[@ElectronicsCircuitHubECH]

Hi...Reduce the back emf using freewheeling diode or snubber. And have some safety Margin to mosfet Vds.

[@jackykhaw4978]

Hi Master can I ask u some mosfet? The body type AENA SOT-23 u can get the datasheet?

[@ElectronicsCircuitHubECH]

Hey...thanks for question....could you please reach me out on whatsapp?