fet suppliers

[bobmcree]

for some reason i do not understand, a member recently made negative comments about my suggesting http://www.irtronix.com as a supplier of fets when i suggested that their price on the 4110 of $2.60 was great. people have their own reasons for preferring one supplier over another, but this guy tried to say that we should use more cheap fets rather than fewer good ones, and that we should only buy them from the big vendors like arrow or future. my response to this is "bs"

i recently posted that irtronix had the 4110 at this great price, and people apparently snapped them up, because they are now out, but they will be getting 2k more at the same price in a couple of weeks for those who missed out on this batch. call mike n. at 310-787-1100 to place an order.

i see that the 4310 is now being more widely used, and they normally have these in stock for about 2.40

if people prefer to buy their fets at a higher price elsewhere that is fine with me, but for those of us who want premium quality at bargain prices i continue to heartily recommend irtronix

 

[fechter]

Thanks Bob.

DigiKey sells the 4110's for $4.29, you need a $25 minumum order to avoid a handling fee, and they were out of stock for several months. Last time I checked them, they had about 5k in stock. They go fast.

Hey, if people want to waste money, somebody will always be around to take it.

 

[cadstarsucks]

for some reason i do not understand, a member recently made negative comments about my suggesting http://www.irtronix.com as a supplier of fets when i suggested that their price on the 4110 of $2.60 was great. people have their own reasons for preferring one supplier over another, but this guy tried to say that we should use more cheap fets rather than fewer good ones, and that we should only buy them from the big vendors like arrow or future. my response to this is "bs"

i recently posted that irtronix had the 4110 at this great price, and people apparently snapped them up, because they are now out, but they will be getting 2k more at the same price in a couple of weeks for those who missed out on this batch. call mike n. at 310-787-1100 to place an order.

i see that the 4310 is now being more widely used, and they normally have these in stock for about 2.40

if people prefer to buy their fets at a higher price elsewhere that is fine with me, but for those of us who want premium quality at bargain prices i continue to heartily recommend irtronix

I could not find them on their site and that was a special price as far as I could tell... I also said that in a production environment it is more important that the thing is always there than it is to be the absolute least expensive as it costs more to have a production line go down than to save a 10% on component costs. It makes a big difference when you are ordering 6K at a clip on a regular basis.

Dan

 

[OneEye]

Bob's post was not directed at multi-thousand-unit manufacturers, it was aimed at bargain-bin hobbyists who will jump at the chance to get a handful of parts on the cheap as long as the parts are reliable. The long term source stability is much less of a concern for hobbyists than it is for manufacturers.

 

[cadstarsucks]

Bob's post was not directed at multi-thousand-unit manufacturers, it was aimed at bargain-bin hobbyists who will jump at the chance to get a handful of parts on the cheap as long as the parts are reliable. The long term source stability is much less of a concern for hobbyists than it is for manufacturers.

I know, but my comment that he sniped about was, and clearly specified as such. That along with the possibility that two of the half priced ones could outperform his suggestion rubbed him the wrong way.

Simply stated if two half price ones together have the same Rds they will probably have a better Rtj-c ( junction to case thermal resistance ) resulting in a lower junction temperature and longer life.

Dan

 

[OneEye]

Fair enough.

Hey, are you going to bring your avatar over here from the other forum?

edit: and there it is...

 

[bobmcree]

Bob's post was not directed at multi-thousand-unit manufacturers, it was aimed at bargain-bin hobbyists who will jump at the chance to get a handful of parts on the cheap as long as the parts are reliable. The long term source stability is much less of a concern for hobbyists than it is for manufacturers.

I know, but my comment that he sniped about was, and clearly specified as such. That along with the possibility that two of the half priced ones could outperform his suggestion rubbed him the wrong way.

Simply stated if two half price ones together have the same Rds they will probably have a better Rtj-c ( junction to case thermal resistance ) resulting in a lower junction temperature and longer life.

Dan

just to "clear the air", i certainly did not mean to "snipe" about your comment, i just did not think it necessary to make it sound like i was attacking your ideas personally. i just did not understand why you would be so negative about what most of us believe is the best part for the task at hand. my post was clearly directed at folks replacing the fets in their controllers, and you changed the whole character of the discussion into one of the relative merits of different vendors and longterm availability of parts.

the vendor i suggested, irtronix (http://www.irtronix.com) is not a "boutique" or hobbyist vendor. irtronix is a full partner with ir and does not handle just odd lots or hobby quantities. they have access to the same parts as any other major vendor, and offer very competitive prices. i have dealt with them for several years and they are dependable and professional in every regard.

they will be getting another shipment of 2000 of the irf4110pbf fets later this month and their quoted price to me was $2.60. this is not for a mix of odd lot parts or anything other than the same parts one would get from arrow or future or any other major vendor.

i am designing a new controller right now, and i will use the 4110 fets. there is not a better part for the job imho, and there is no reason to believe the parts will not continue to be available from other vendors as well, but if irtronix has the best price i will continue to buy from them.

 

[cadstarsucks]

the vendor i suggested, irtronix (http://www.irtronix.com) is not a "boutique" or hobbyist vendor. irtronix is a full partner with ir and does not handle just odd lots or hobby quantities. they have access to the same parts as any other major vendor, and offer very competitive prices. i have dealt with them for several years and they are dependable and professional in every regard.

they will be getting another shipment of 2000 of the irf4110pbf fets later this month and their quoted price to me was $2.60. this is not for a mix of odd lot parts or anything other than the same parts one would get from arrow or future or any other major vendor.

i am designing a new controller right now, and i will use the 4110 fets. there is not a better part for the job imho, and there is no reason to believe the parts will not continue to be available from other vendors as well, but if irtronix has the best price i will continue to buy from them.

It is a good part. The quantities they have available on various parts are not indicative of a stocking distributor. Industry distributors would have reels and reel pricing online. That is why I unceremoniously put them in with likes of Newark and Jameco. While they would like to be actual industry distributors, getting on the list with the mfg and advertising in EETimes does not make it so.

Dan

 

[bobmcree]

The quantities they have available on various parts are not indicative of a stocking distributor. Industry distributors would have reels and reel pricing online. That is why I unceremoniously put them in with likes of Newark and Jameco. While they would like to be actual industry distributors, getting on the list with the mfg and advertising in EETimes does not make it so.

Dan

nobody on this list cares whether they have reels of parts listed online.

may i ask by what criteria you consider yourself to be a judge of who is and who is not an "actual industry distributor"?

 

[cadstarsucks]

may i ask by what criteria you consider yourself to be a judge of who is and who is not an "actual industry distributor"?

Being an electronic engineer and having to deal with supply issues for years and not being able to rely on sources over and over again... Getting burned when price quoted were based on this sort of "distributor" and having to pay twice as much in production.

Dan

 

[cadstarsucks]

may i ask by what criteria you consider yourself to be a judge of who is and who is not an "actual industry distributor"?

Being an electronic engineer and having to deal with supply issues for years and not being able to rely on sources over and over again... Getting burned when prices quoted were based on this sort of "distributor" and having to pay twice as much in production.

Dan

 

[bobmcree]

may i ask by what criteria you consider yourself to be a judge of who is and who is not an "actual industry distributor"?

Being an electronic engineer and having to deal with supply issues for years and not being able to rely on sources over and over again... Getting burned when prices quoted were based on this sort of "distributor" and having to pay twice as much in production.

Dan

i worked as an engineer for over 30 years and retired 3 years ago. i think it is unfair of you to deride a vendor like irtronix based on your past bad experiences with other vendors.

i was always required to provide multiple sources for parts i used in my designs, unless of course they were proprietary. the way to avoid surprises is to negotiate long-term scheduled delivery and price. this is a volatile industry and prices change.

you objected to my use of an hid light on the basis of your experience, and you were clearly shown to be mistaken, and your information outdated.

i believe you are just arguing a moot point for the sake of argument. the idea of whether irtronix is an acceptable vendor for high volume production has nothing to do with my posting of an outstanding price for a part some of my friends want. the fact that i can continue to buy thousands of parts at this price is enough for me to designate them as an "actual industry supplier", and apparently i have just as much authority as you to make such a designation.

please find someone else's posts to attack if your goal is just to argue irrelevant points. if you have a legitimate point i will respond, otherwise i will not.

 

[cadstarsucks]

you objected to my use of an hid light on the basis of your experience, and you were clearly shown to be mistaken, and your information outdated.

i believe you are just arguing a moot point for the sake of argument. the idea of whether irtronix is an acceptable vendor for high volume production has nothing to do with my posting of an outstanding price for a part some of my friends want. the fact that i can continue to buy thousands of parts at this price is enough for me to designate them as an "actual industry supplier", and apparently i have just as much authority as you to make such a designation.

please find someone else's posts to attack if your goal is just to argue irrelevant points. if you have a legitimate point i will respond, otherwise i will not.

Actually I stated quite clearly that there were HIDs that were OK at night and some that were horrid.

I can NOT go to their site and have any confidence in getting hundreds repeatably let alone thousands. You have made no attempt at a statement of buying thousands and by your own admission they are only buying a few hundred at a time.

I NEVER said that the part was not a good solution. I did say that two with twice the Rds in parallel would perform more reliably as they would dissipate the same amount while having a lower TRj-c yielding better reliability... Of course if you enjoy replacing FETs day in and day out if you are in the habit of overdriving your bike, by all means be my guest. The only proof that a design will not blow is in the trying, or presumably, in the calculation if it is concise enough with sufficient margin.

Dan

 

[Dalecv]

I think I found where the 4110 FETS might have gone, I now see that ebike.ca is selling them for $5. That site must be a capitalist venture. :lol:

 

[Jozzer]

Give it up already Dan, Bob was just trying to do us small time tikerers a source of hard to find components, and we appreciate it very much.
If you want to suggest/argue that we use different components, start your own thread, but I for one am glad Bob finds the time to post here and be helpfull, please don't discourage that.

Exit, stage left.

 

[cadstarsucks]

Give it up already Dan, Bob was just trying to do us small time tikerers a source of hard to find components, and we appreciate it very much.
If you want to suggest/argue that we use different components, start your own thread, but I for one am glad Bob finds the time to post here and be helpfull, please don't discourage that.

Exit, stage left.

I was only trying to point out that when they were not available, as the previous poster is saying (well for the fabled $2.50 at least) 2 $1.50 parts would outperform them.

Dan

 

[bobmcree]

Actually I stated quite clearly that there were HIDs that were OK at night and some that were horrid.

I can NOT go to their site and have any confidence in getting hundreds repeatably let alone thousands. You have made no attempt at a statement of buying thousands and by your own admission they are only buying a few hundred at a time.

I NEVER said that the part was not a good solution. I did say that two with twice the Rds in parallel would perform more reliably as they would dissipate the same amount while having a lower TRj-c yielding better reliability... Of course if you enjoy replacing FETs day in and day out if you are in the habit of overdriving your bike, by all means be my guest. The only proof that a design will not blow is in the trying, or presumably, in the calculation if it is concise enough with sufficient margin.

Dan

i am going to try one last time to clarify what is happening here: you made a sarcastic attack on my post about an hid light with the comment "check your peripheral vision" then launched a tirade on why hid lights were terrible for night vision.

it was only after i pointed out the blue energy from the hid lights used by me and everyone else who uses hid for bike, motorcycle, or auto lighting that you agreed mine was ok.

i suggested a perfectly good source for a part many of us would like to use at a very good price and you launched into a tirade on why we should use cheaper parts or buy them from someone else.

you just misrepresented what i said about them having 2000 parts coming in later this month at a price of $2.60

you appear to be trying to increase your power rating by posting tangential responses that have nothing to do with the threads i start.

start your own threads if you just want to argue about what a knowledgable engineer you are. the people here already know me.

 

[cadstarsucks]

it was only after i pointed out the blue energy from the hid lights used by me and everyone else who uses hid for bike, motorcycle, or auto lighting that you agreed mine was ok.

Yes, the ones that you use...you had not defined which of the three varieties you were using.

i suggested a perfectly good source for a part many of us would like to use at a very good price and you launched into a tirade on why we should use cheaper parts or buy them from someone else.

you just misrepresented what i said about them having 2000 parts coming in later this month at a price of $2.60

Sorry for my brain fart.

you appear to be trying to increase your power rating by posting tangential responses that have nothing to do with the threads i start.

start your own threads if you just want to argue about what a knowledgable engineer you are. the people here already know me.

I could care less about the "power rating". My original comment was simply that if that part was not readily available using two of the others would perform better for less than the $6 that one would cost otherwise. Nothing more.

Dan

 

[Dalecv]

Bob:

Thank you for supplying good information and keeping it within the 400 - 700 nanometer range. Please don't let those with poor information from outside of the spectrum to limit your input, because it will not be considered by those of us who know where the light shines.

 

[Toorbough ULL-Zeveigh]

Yes, interesting thread.
I've been following it very closely & what I've got out of it is that CadStar is probably a decent cad package & that I really ought to check it out for myself.

 

[cadstarsucks]

Yes, interesting thread.
I've been following it very closely & what I've got out of it is that CadStar is probably a decent cad package & that I really ought to check it out for myself.

Talk about off topic! Cadstar is a poorly written electronics package that crashes regularly at times resulting in complete loss of the design. And for this hair pulling happiness you get to pay $20K for a full license for a single engineer.

Dan

 

[Jozzer]

:lol:

 

[Toorbough ULL-Zeveigh]

And for this hair pulling happiness you get to pay $20K for a full license for a single engineer.

Dan

Is that what happened to all your hair then?
And now you can't afford a toop.

 

[cadstarsucks]

And for this hair pulling happiness you get to pay $20K for a full license for a single engineer.

Dan

Is that what happened to all your hair then?
And now you can't afford a toop.

Good one... no...don't like dressing up.

Dan

 

[bobmcree]

i contacted irtronix, and they said they would fix the problem of the irfb4110 showing up online. in 2 weeks when they get another 2000 pcs orders can be placed online at the prices i mentioned.

if you want 50 or more i expect you can call mike at the number i posted previously in this thread.

i think cds might have misunderstood my intentions to use 2 of these to replace 2 fets with double the Rds-on. not 1 for 2, and that may have been the basis for his argument that 2 cheaper fes were better.

most arguments are based on misunderstandings.