I am looking for help in selecting a proper MOSFET for our project. We will be utilizing a MOSFET to switch higher current up to 5A at 24V to a coil. We will be utilizing a microcontroller to control the gate voltage to determine the current across the coil. So the VGS(th) will need to be quite l…

Hello, welcome to the TechForum! Would something like 497-13975-5-ND work for you?

I would suggest looking at this forum post. [image] How to Interface a Microcontroller with a Relay Using a MOSFET Maker, DIY A microcontroller is a low-power logic device. By itself, it is generally incapable of directly driving a relay. A single N-channel MOSFET may be …

Thank you @Steven_14444 , An alternative for @Apex4446 is to use a Darlington. They are a bit easier to drive directly from a microcontroller. Also, it is possible to place devices in parallel for even more current provided a small emitter resistor is used. Ref: [image] Driving a …

Sorry for the late response, notifications were going to junk mail. But thanks guys, ill read through all of this stuff and come back with any questions. Really appreciate it. This project has been a struggle and even more so finding the help along the way so really appreciate it.

Read through all that stuff and continued to do some more research into Darlington pairs. Definitely feel this is the way to go. But I’ll be honest trying to understand some of the graphs on the datasheets gets intimidating. Would something like the BDW93C work. My worry is the output current fr…

Hello @Apex4446 , To summarize, you are looking to switch a 5 A inductive load (coil) operating at 24 VDC. You desire a simple to use interface between the microcontroller and the coil. One more question, is turn on and off speed important to you? Assuming no, I recommend using an interposing rela…

Yea we have a coil where our max current is 5A at 24V. We are generating a magnetic field and by controlling the current across the coil we can change the magnetic fields. Switching speeds is very important. The current will be changing rapidly (ms range) to varying conditions based on telemetry s…

If linearly variable current control with any degree of precision is the objective, something slightly more involved than a plain 'ol transistor is likely going to be needed. One approach may be a circuit of the sort below: [image] The concept here would be to fake an analog signal by filtering …

Very interesting, thanks rick. I’ll run this one though multisim and play around with it.

Hello @Apex4446 , The circuit described by @rick_1976 is a classic and reliable solution. It works very well, but I once forgot the heatsink and burned my finger on the BJT. Let me add two more thoughts to this conversation: The speed of turn on an off is dominated by the coil inductance. This a…

Help in selecting MOSFET for Project needs

Semiconductor Discrete Semiconductor Products

Steven_14444 April 2, 2025, 6:50pm 3

I would suggest looking at this forum post.

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Help in selecting MOSFET for Project needs

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