Hey guys, looking at getting some 2n5457 as the j201 cant be used interchangeably with the 2n5457 and some builds require them. Anyone know of a 'equivalent' or direct replacement for the 2n5457? As with the j201 -> mmbfj201 being the SMT version. Is there such a thing for the 2n5457?
Thanks for any help, I cant seem to find anything online.
Paul
Sure, it's MMBF5457.
lol, I searched for a lot things, cant believe it didn't actually search for that... (facepalm)... Thanks mate :D
While on the subject, what about an SMD equivalent to 2SK170?
Quote from: jubal81 on January 07, 2014, 11:35:34 PM
While on the subject, what about an SMD equivalent to 2SK170?
I haven't checked that one. I will look into that.
Btw, apparently Central Semi makes through-hole 2n5457s. They are pricey at Mouser, but maybe they will come down.
Awesome! Looking into the price of the SMT 2n5457...their pricey...unless you buy 10,000 of em :D
I have requested samples from central semiconductor for the throughhole 2n5457. Might end up being a PITA. Time will tell, assuming they are willing to send them of course...
I've never tested a jfet before believe it or not, just ran on blind luck. Pretty sure I have Jacobs jfet tester around. I'll test these out when / if they arrive and let you know how I go, or whatever they respond with. Its a bit strange though, mouser seems to be the only one that has them...
Quote from: chromesphere on January 08, 2014, 12:46:31 AM
Awesome! Looking into the price of the SMT 2n5457...their pricey...unless you buy 10,000 of em :D
They usually come down to about 15 cents if you buy 100 or so. Were you looking for a lower price than that?
I had a sniff around and the only sort of pricey I could find for anything near 15c each where in reels. Where did you get 15c each per 100? That's probably worthwhile the trouble considering most throughhole 2n5457's are currently running at 50-60c each.
In small quantities, they cost about the same as the through-hole 5457s at Small Bear.
I've been thinking about paralleling TH & SMD for JFETs on future layouts so either could be used.
Quote from: chromesphere on January 08, 2014, 12:59:02 AM
I had a sniff around and the only sort of pricey I could find for anything near 15c each where in reels. Where did you get 15c each per 100? That's probably worthwhile the trouble considering most throughhole 2n5457's are currently running at 50-60c each.
Mouser.
http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/MMBF5457/?qs=%2fha2pyFadugtgxMwpDhz9PSUu1ugkRVkm1P20dwMrzY%3d
100 @ 20c is getting better. I'm just calculating the effort involved soldering a converter board with these, imo they have to be quite a bit cheaper to justify the extra work.
I think when you hit the 2000 range on those Through holes from Mouser you're starting to look at ok prices. I know .48 might not seem like ok prices, but compared to $1.06 a piece?!?
I'm sure we could easily get up a group buy on 2000 of those through hole type no problem...
Jacob
When they are in stock, I'll throw a few of them in my Mouser cart. We should make sure they function the same as the Fairchild before we buy a bunch.
How does the datasheet stack up? I know its only a datasheet, but its a start...I ask because I know absolutely nothing about fets :)
http://www.centralsemi.com/PDFs/products/2N5457-5459.PDF
Quote from: jubal81 on January 07, 2014, 11:35:34 PM
While on the subject, what about an SMD equivalent to 2SK170?
I thought that I had seen an announcement from Toshiba that they were doing these in SMT, but I just checked their website and didn't see anything that seemed a reasonable match. There are the LSK170's available in surface mount if you can find them anywhere. I haven't tried them myself, but I've read that they are good replacements for the 2SK170.
http://www.linearsystems.com/assets/media/file/datasheets/LSK170.pdf (http://www.linearsystems.com/assets/media/file/datasheets/LSK170.pdf)
Quote from: RobA on January 08, 2014, 09:43:52 PM
Quote from: jubal81 on January 07, 2014, 11:35:34 PM
While on the subject, what about an SMD equivalent to 2SK170?
I thought that I had seen an announcement from Toshiba that they were doing these in SMT, but I just checked their website and didn't see anything that seemed a reasonable match. There are the LSK170's available in surface mount if you can find them anywhere. I haven't tried them myself, but I've read that they are good replacements for the 2SK170.
http://www.linearsystems.com/assets/media/file/datasheets/LSK170.pdf (http://www.linearsystems.com/assets/media/file/datasheets/LSK170.pdf)
Yeah, it's finding them that's the issue. Octopart doesn't show any. Ideally, I'd like something that Mouser carries.
Looking at their lineup, I see an 2SK880 JFET (for about 60 cents, ouch). I'm pretty sure I've seen the guys at DIYaudio praising these.
Just spotted PMBFJ620. It's a dual package - interesting possibilities.
Quote from: jubal81 on January 08, 2014, 11:05:55 PM
Just spotted PMBFJ620. It's a dual package - interesting possibilities.
Yeah, that's the one I started the other thread on. It is interesting and I've got a few to try out, but I'm not sure yet.
Quote from: RobA on January 08, 2014, 11:08:14 PM
Quote from: jubal81 on January 08, 2014, 11:05:55 PM
Just spotted PMBFJ620. It's a dual package - interesting possibilities.
Yeah, that's the one I started the other thread on. It is interesting and I've got a few to try out, but I'm not sure yet.
Cool. Sorry I missed that thread. Love to hear what you think about it.
Quote from: jubal81 on January 08, 2014, 11:10:24 PM
[...]
Cool. Sorry I missed that thread. Love to hear what you think about it.
No problem, I probably should have stuck it in this thread, but I was hoping to catch eyes that weren't interested in 2N5457's (if there are any of those eyes around here).
I'll report back on them after I do a bit of testing. Any circuit you'd like me to try out? I'd really like to hear of some other's experience with them too.
Quote from: RobA on January 08, 2014, 11:15:06 PM
Quote from: jubal81 on January 08, 2014, 11:10:24 PM
[...]
Cool. Sorry I missed that thread. Love to hear what you think about it.
No problem, I probably should have stuck it in this thread, but I was hoping to catch eyes that weren't interested in 2N5457's (if there are any of those eyes around here).
I'll report back on them after I do a bit of testing. Any circuit you'd like me to try out? I'd really like to hear of some other's experience with them too.
Just off the top of my head I'm thinking Mu-amp drives ala Catalinbread and then discrete opamps. We all know REAL phasers use optocouplers ;)
Quote from: jubal81 on January 08, 2014, 11:17:43 PM
...
Just off the top of my head I'm thinking Mu-amp drives ala Catalinbread and then discrete opamps. We all know REAL phasers use optocouplers ;)
:D. I do love Phase 45's though. I think they may be my favorite modulation pedal.
I'll look in to trying them. They might well be good for doing discrete opamp input stages. I think I saw paired JFET's with joined sources that might be good for that too. I'll have to look and see if I can find them again.
Quote from: jubal81 on January 08, 2014, 11:17:43 PM
Just off the top of my head I'm thinking Mu-amp drives ala Catalinbread and then discrete opamps. We all know REAL phasers use optocouplers ;)
Hm, Mu-amps are kind of a waste of matched fets, since biasing them doesn't do much of anything ... now, matched FET pairs like Wampler, on the other hand ... maybe someone should send the link to Brian, I'm sure he'd appreciate the hell out of not having to match SMD FETs!
Hey,
Was wondering how people got on with the central semiconductor JFETs, thinking about ordering a bunch although it looks to be out of stock right now.....
Cheers,
Marcus
Try this one out,
http://ciiva.com/CloudSearch/SearchComponent?searchCondition=2n5457
http://ciiva.com/CloudSearch/Component/848764/fairchild-semiconductor-2n5457
http://ciiva.com/CloudSearch/Component/1026596/nte-electronics-nte457
http://ciiva.com/CloudSearch/Component/848729/fairchild-semiconductor-j109-d26z