 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Microcontroller and PC projects : IRL7833PBF N-Ch Power MOSFET, 30V 150A
| Author | Message | ||||
| lizby Guru  Joined: 17/05/2016 Location: United StatesPosts: 3480 |
What's not to like? $7.99US for 10 on Amazon. For VGS = 4.5V, ID = 30, RDS(on) is 4.7mOhm max. Datasheet indicates that turn-on at 3V3 should be good. Is there a better N-CH mosfet out there for the picomite for under $1US? (Looking to switch 12V--I know many are adequate--I'm using IRLZ44Ns now.) PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
||||
| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 719 |
I would NOT use the IRLZ44N for 3v3, because of its Vgs @ 4Volts , 3V3 isn't even listed in the datasheet. I would use something like: IRF 7401 MOSFET, N-Channel, 20V, 8,7A, 0,022R, SO-8 (@ 2.7V it switches 3.5A) or IRF6201 (SO8 20V), N-Channel (2.5V @ 22A !!) or IRL6244 (2.5V @ 5.1A) Greetings Daniel All of them are < 1 Euro |
||||
| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3480 |
I understand. However, it's what I had, and it works with no detectable heating (with current less than 3A at 12V). ~ Edited 2022-04-02 03:51 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
||||
| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 719 |
If it works for you it is all good :) I have a lot of them lying around here, but never used them for 3v3 logic, only 5v. But since it is for TTL (IRLZ44N) it may work even down to 3v3. What are you using it for? What does it switch? Greetings Daniel |
||||
| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10620 |
Check figure 3 in the datasheet. This part does 10A at less than 3V. All the IRL parts are specifically logic friendly (IRL). The one downside is that they typically have a highish gate capacitance |
||||
| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 719 |
Still RDS(on) isn't specified at 3.3Volts in the datasheet! The RDS(on) is getting higher the lower you set the voltage. At 4v it is for example 0,035 Ohm. If this isn't a problem it will be ok. But personally I would suggest to put a driver before the mosfet. Logic does not mean always down to 3v. The logic in the datasheet example is 5v. Greetings Daniel Edited 2022-04-02 21:00 by Amnesie |
||||
phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2832 |
Sticking to the specs. is important for a manufacturer but for a one off I just measure what I have to see if it will do the job. On a breadboard hook the mosfet up to a load resistor, apply desired gate voltage and measure its voltage drop. Takes less time than downloading and reading the datasheet. |
||||
| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3480 |
Nothing big: switching 12V for this and this and 12V 15W LED Bulb E27 Lamps, E27 3-bulb & 1-bulb fixtures.  PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
||||
Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8298 |
The end of the world is at hand! The lovely clicky relay is out of fashion! ;) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
||||
| Tinine Guru Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
Price has increased on these things. I got 10 for <16 quid:  Craig |
||||
| Tinine Guru Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
Newsflash: That would be circa 1980  Putting some documentation together, per our chat. Playing with the HC-05 BT right now and quite impressed. I normally use a more sophisticated BT-232 unit but I might just switch to this  Craig |
||||
| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8298 |
Nah - the relay will finally go out of use when there's a normally-closed mosfet that *stays* normally closed, with very close to zero volt drop, indefinitely and without a supply to it. :) I probably need something else to do - I've just about finished the VGA mini version 3.0 now, including the circuit. I've also done a little "PLC" board that will plug directly into any of my IO modules or the VGA mini 3.0. It has 4 opto-isolated digital in, 3 Analogue in that use the same programming modules as my SSD1963 backpack (but not at 5V) and three SPST clicky relay outputs. The I2C is out on pass-through terminals and GP6/GP7 are available on a header because the board plugs directly into the IO module, blocking the socket. The whole thing is the same size as the other IO module PCBs in the series and would fit in a heavily modified case. An external supply is needed for the relay coils as I've not found any that operate at 3V3 at any sensible current. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
||||
| Tinine Guru Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
Oh, I totally agree about the advantages of clicky relays and I am including several for stuff that needs to be fail-to-safe. Can't wait to see the PLC device  At some point I wanna get a handle on this PIO stuff; sounds too cool not to use it for something. The Pico impresses me more and more. Craig |
||||
| phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2832 |
"Nah - the relay will finally go out of use when there's a normally-closed mosfet that *stays* normally closed, with very close to zero volt drop, indefinitely and without a supply to it. :)" And has multiple bi-directional channels with 440VAC isolation between them! |
||||
| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8298 |
Oh, go on then, Craig. :) mini interface 12.zip Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
||||
| Tinine Guru Joined: 30/03/2016 Location: United KingdomPosts: 1646 |
KB814 is discontinued (RS Online)but plenty on Aliexpress. Love the AC input type. This is more of what we need to talk about re: my project. |
||||
| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8298 |
Doesn't surprise me that it's discontinued - it's through-hole DIP. Before long it'll be SMD (the KB814) or don't bother. :( They are still listed at Bitsbox but I don't know what their stock is like. Edited 2022-04-04 02:32 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
||||
 Print this page |
 |
The Back Shed's forum code is written, and hosted, in Australia. | © JAQ Software 2025 |
