Electronics > Beginners
Selecting MOSFET
permal:
So based on @Spec's list, I'm looking at Si2374DS for an N-channel version. Searching for similar chips, but P-channel, I found SI2323CDS which looks nearly identical to my untrained mind, except the mode.
* Any objections to these?
* Both datasheets specify "Continuous Drain Current" in their Abs Max section, with the caveat that t=5S. How is that "continuous"?
* As I'm going to need eight of each and they'll all be placed on a row (at the I/O connectors), I'm just wondering if another model in dual/quad package is a better option?
spec:
--- Quote from: permal on January 15, 2019, 08:24:16 pm ---So based on @Spec's list, I'm looking at Si2374DS for an N-channel version. Searching for similar chips, but P-channel, I found SI2323CDS which looks nearly identical to my untrained mind, except the mode.
* Any objections to these?
* Both datasheets specify "Continuous Drain Current" in their Abs Max section, with the caveat that t=5S. How is that "continuous"?
* As I'm going to need eight of each and they'll all be placed on a row (at the I/O connectors), I'm just wondering if another model in dual/quad package is a better option?
--- End quote ---
Your choice is fine, but I would recommend the Si2312CD (NMOSFET), and Si2323CDS (PMOSFET) (as you chose) because they are the latest MOSFETs from Vishay.
You can get dual MOSFETs in one case, but I would advise sticking to singles. They are in an SOT23 case which is pretty compact, but bigger than most cases these days, so easier to handle.
spec:
--- Quote from: permal on January 15, 2019, 07:02:50 pm ---
--- Quote from: spec on January 15, 2019, 08:11:00 am ---Attached below is a snapshot of my directory for PMOSFETs up to 10A, which you may be interested in:
--- End quote ---
You should put them up on Github or some such, I'm sure other people like me also struggle with this.
--- End quote ---
Hmm that's an idea. The thing is that the list changes frequently as new devices become available. Also I have multiple lists for most components so where would it end. :)
(The NMOSFET table took 12 hours to do, so it is not a quick task.)
permal:
--- Quote from: spec on January 15, 2019, 09:39:31 pm ---Your choice is fine, but I would recommend the Si2312CD (NMOSFET), and Si2323CDS (PMOSFET) (as you chose) because they are the latest MOSFETs from Vishay.
You can get dual MOSFETs in one case, but I would advise sticking to singles. They are in an SOT23 case which is pretty compact, but bigger than most cases these days, so easier to handle.
--- End quote ---
Ok, I'll go with your recommendation :) Finally I can make some progress on this project :)
--- Quote from: spec on January 15, 2019, 09:49:17 pm ---Hmm that's an idea. The thing is that the list changes frequently as new devices become available. Also I have multiple lists for most components so where would it end. :)
(The NMOSFET table took 12 hours to do, so it is not a quick task.)
--- End quote ---
I have no idea how you do it, but I keep all my documents, code and such in Git. It not only gives you revision history, it also acts as an extra backup. I've found this to be helpful even for schematics although they are not as easy to compare as source code, but it is doable. I've lost count of the times where I've reverted back to a previous version to start over. Perhaps commercial tools have this built in, KiCad does not.
I'm not surprised it takes a lot time to compile the list, god knows I've spent hours just trying to select these and I had good help from you.
spec:
--- Quote from: permal on January 16, 2019, 08:06:04 am ---
--- Quote from: spec on January 15, 2019, 09:39:31 pm ---Your choice is fine, but I would recommend the Si2312CD (NMOSFET), and Si2323CDS (PMOSFET) (as you chose) because they are the latest MOSFETs from Vishay.
You can get dual MOSFETs in one case, but I would advise sticking to singles. They are in an SOT23 case which is pretty compact, but bigger than most cases these days, so easier to handle.
--- End quote ---
Ok, I'll go with your recommendation :) Finally I can make some progress on this project :)
--- Quote from: spec on January 15, 2019, 09:49:17 pm ---Hmm that's an idea. The thing is that the list changes frequently as new devices become available. Also I have multiple lists for most components so where would it end. :)
(The NMOSFET table took 12 hours to do, so it is not a quick task.)
--- End quote ---
I have no idea how you do it, but I keep all my documents, code and such in Git. It not only gives you revision history, it also acts as an extra backup. I've found this to be helpful even for schematics although they are not as easy to compare as source code, but it is doable. I've lost count of the times where I've reverted back to a previous version to start over. Perhaps commercial tools have this built in, KiCad does not.
--- End quote ---
I have been burnt a couple of times with using the cloud, either when the vendor puts their price up to ridiculous levels, or throttles their service, so I now use a NAS, with dual redundancy.
Configuration control is not that difficult: just give all your items a date and issue, and anything that you think may be vaguely useful just save it and start a new issue.
--- Quote from: permal on January 16, 2019, 08:06:04 am ---I'm not surprised it takes a lot time to compile the list, god knows I've spent hours just trying to select these and I had good help from you.
--- End quote ---
Glad the list was a help.
I have kept lists of useful components since before home computers or the internet were even thought of. The way it works is that if I see a component that looks useful, I just store the datasheet. For example many EEV members mention components that are interesting.
On a new project I, or someone else, generates a list of preferred components for that project, so that everyone working on the project chooses components from the project preferred list first. For example, all decoupling capacitors may be 100nF, 35V working, X7R.
Then there are component lists of potential components for a particular design, as in the list of 3V3 logic level NMOSFETs.
All this may sound pretty heavy, but it pays big dividends and saves a lot of time in the long run. And if you are just keeping lists for home electronics, there should not be that many components anyway.
It can be quite interesting, at least I think so, learning about new components, some of which, like the OPA192 series of opamps, depletion mode NMOSFETs, and the relatively new GaN MOSFETs, which are becoming available at a reasonable price, are game-changers and open up new design avenues.
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