i occasionally toy with the idea of opening a small parts shop when i retire, with a web presence of course. silly idea. like surplus sales of nebraska or dan’s small parts, if either of those is still around.
@@anthonyshiels9273 Are we watching the same video ? a good 2N2222 doesn't break down at like 8V, actually now that I think about it the response for all of them is weird, maybe an issue with the curve tracer.
I was thinking the TO92 version may have been the PN2222 that has the emitter and collector reversed from the 2N2222, but the tester showed it as being the same pinout. Looks like maybe a bad transistor...
Back in the late 1970s... the TO92 2N2222 was my very first transistor. English electronics shops kept telling me our BC108 was equivalent... but I was a kid who knew nothing and I was highly suspicious of this "equivalence" malarkey.
For what you were going to use it for the bc107/8/9 would be fine. Different package but 2n2926 would also be ok. Good electronics design is to make the actual transistor needed almost irrelevant. 'Small signal NPN' on a circuit diagram is a good sign.
The other classic is the 2N3904 with its PNP compliment the 2N3906. Both old parts that live on. I think the 2N2222A can handle more collector current but the 2N3904 can go faster. Someone correct me if I have got this wrong.
Yeah, I’ve built one that uses XY on the scope. Didn’t really like it. Mostly because you don’t know the scale without thinking. Don’t like the computer ones either. I want something standalone with its own screen. Like the big Tek curve tracer, but in a way smaller package.
@@jimomertz if ever see a working tek curve tracer at an electronics flea market or hamfest, if the price isn’t insane it’ll be coming home to live in my basement workshop, that’s for sure.
@@kenchiltonUnless the die has isolation on the bottom/attach, these will be 4 separate die on 4 mutually isolated parts of leadframe unless the datasheet explicitly guarantees otherwise - and even then I’d want to see it with my own eyes on an X-ray or a decap. They will *usually* come from the same wafer but that’s just luck of the draw. If the datasheet doesn’t guarantee that the parts are matched, they are not.
@3:37 - it is not the first time when I see that on the left side of the Atlantic the position of the digits is not really important: 7.4 or 4.7 - both are....: "four point seven mA" - buhahahah ;-)
This breakdown looks weird. Normally, the collector current increases at excessive voltages. However, on your curve tracer, the current decreases. Is there perhaps some power limiting circuit inside the curve tracer that kicks in? Can you try with a higher power setting?
Back in the 1970s our avionics test stations used those by the hundreds as relay switchers stimulus/monitoring lines. Even with proper diodes on the relays, we spent as much time troubleshooting the test gear as the aircraft electronics as the 2222s would open CE.
I could be wrong, but I thought that the "2222: that was in the To-92 package was labeled PN2222, NOT 2N2222. The one you tested was most likely a poor quality fake.
I have not seen one. I have owned similar units, they were fine and I learned a lot when starting out. you might want to look for one that sweeps. lots of old 2MHz generators on eBay from companies like BK Precision
I wish they still made the 2N2223... yeah "3" at the end. Two 2N2222s made on the same substrate, electrically and thermally matched, in metal TO-5 can. Those were useful. Stopped being made about 30 years ago I think.
Wish there was still a store near me like the one you have. As far as I can tell they're all gone.
i occasionally toy with the idea of opening a small parts shop when i retire, with a web presence of course. silly idea. like surplus sales of nebraska or dan’s small parts, if either of those is still around.
@tripplefives1402 obviously i’m not intending to do this to make money.
@tripplefives1402 i wasn’t contemplating making money at this. and, as i said , silly idea.
That TO-92 is clearly damaged, this is a good reason why you should not completely rely on simple transistor testers.
Cosmetic damage to the plastic case is just that, cosmetic. Per FNIRSI Component Tester and the Curve Tracer the actual Die is in perfect condition.
@@anthonyshiels9273 Are we watching the same video ? a good 2N2222 doesn't break down at like 8V, actually now that I think about it the response for all of them is weird, maybe an issue with the curve tracer.
I was thinking the TO92 version may have been the PN2222 that has the emitter and collector reversed from the 2N2222, but the tester showed it as being the same pinout. Looks like maybe a bad transistor...
I have a bunch of TO-92 versions an they are marked PN2222A. Different strokes and so forth..
Back in the late 1970s... the TO92 2N2222 was my very first transistor.
English electronics shops kept telling me our BC108 was equivalent... but I was a kid who knew nothing and I was highly suspicious of this "equivalence" malarkey.
same as me !
For what you were going to use it for the bc107/8/9 would be fine. Different package but 2n2926 would also be ok. Good electronics design is to make the actual transistor needed almost irrelevant. 'Small signal NPN' on a circuit diagram is a good sign.
The other classic is the 2N3904 with its PNP compliment the 2N3906. Both old parts that live on. I think the 2N2222A can handle more collector current but the 2N3904 can go faster. Someone correct me if I have got this wrong.
there’s also a complementary part for the 2222 - 2209 or 2219, can’t remember which.
2n2907
Yes, love the curve tracer. Would love to have one if it wasn’t so gigantic.
can build tour own; there are even projects on you tube showing how! 😀
like the one I designed: th-cam.com/video/oFHTOQTIi30/w-d-xo.htmlsi=GQTOuCUatO6ha6IF
Yeah, I’ve built one that uses XY on the scope. Didn’t really like it. Mostly because you don’t know the scale without thinking. Don’t like the computer ones either. I want something standalone with its own screen. Like the big Tek curve tracer, but in a way smaller package.
@@jimomertz if ever see a working tek curve tracer at an electronics flea market or hamfest, if the price isn’t insane it’ll be coming home to live in my basement workshop, that’s for sure.
@@jimomertz I completely agree. China still makes big standalone ones, about $1000
There is MPQ2222A too. Four 2N2222A packaged in DIP14.
These were real handy to ensure a close process match and tracked temperatures.
@@kenchiltonUnless the die has isolation on the bottom/attach, these will be 4 separate die on 4 mutually isolated parts of leadframe unless the datasheet explicitly guarantees otherwise - and even then I’d want to see it with my own eyes on an X-ray or a decap. They will *usually* come from the same wafer but that’s just luck of the draw. If the datasheet doesn’t guarantee that the parts are matched, they are not.
@3:37 - it is not the first time when I see that on the left side of the Atlantic the position of the digits is not really important: 7.4 or 4.7 - both are....: "four point seven mA" - buhahahah ;-)
This breakdown looks weird. Normally, the collector current increases at excessive voltages. However, on your curve tracer, the current decreases. Is there perhaps some power limiting circuit inside the curve tracer that kicks in? Can you try with a higher power setting?
Interesting point. It is hard to imagine it breaking down at 5v and the current dropping, however the others were twice as good at the same settings.
Curve tracer loveliness!
Back in the 1970s our avionics test stations used those by the hundreds as relay switchers stimulus/monitoring lines. Even with proper diodes on the relays, we spent as much time troubleshooting the test gear as the aircraft electronics as the 2222s would open CE.
An interesting thing to add to the rokon is punches for connectors to remove pins
That curve tracer works great. I wish I know how to make mine work 1/2 as good as yours.
Worth comparing the junction to case thermal resistance of the different types
When you say "grab bag at the store", what magical store is this? :)
th-cam.com/video/WSjood3v7TI/w-d-xo.htmlsi=tJlqu0ONOu9VX-PY
looks like parasitic oscillation. Are you using flying leads to connect to CT?
The TO-18 2N2222 from Mouser is $2.36 each while the TO-92 PN2222 is 1/10 the price.
I once was a bit distracted ordering some SMT components, that's then I discovered how small a SO-23 was ... hehehe
Oh, SOT-23 is still mostly manageable, but SOT-323 / SOT-553 get downright aggravating.
ProTip: The package designation "TO" stands for "Transistor Outline"
I could be wrong, but I thought that the "2222: that was in the To-92 package was labeled PN2222, NOT 2N2222. The one you tested was most likely a poor quality fake.
Question have you ever assembled any Elenco kits?
th-cam.com/video/k7iZw3MEhN0/w-d-xo.htmlsi=wryzBUkKp1y4LBKT
th-cam.com/video/3rxB-mfd3QY/w-d-xo.htmlsi=yb_UJ8MJVaAMXCn4
th-cam.com/video/CLJHjN1qxHA/w-d-xo.htmlsi=owGiAFQQJJUpdiI7
th-cam.com/video/hliEnveSCus/w-d-xo.htmlsi=CaAL6GRkebjwcTzz
th-cam.com/video/Ua0zhXiTEOo/w-d-xo.htmlsi=boLxjUXyJMElFPY0
@@IMSAIGuy Thanks. Your thoughts on there function generators?
I have not seen one. I have owned similar units, they were fine and I learned a lot when starting out. you might want to look for one that sweeps. lots of old 2MHz generators on eBay from companies like BK Precision
@@IMSAIGuy Thanks sounds like a plan. I love your detailed Videos.
The TO-092 is probably a chinese knock-off
I wish they still made the 2N2223... yeah "3" at the end. Two 2N2222s made on the same substrate, electrically and thermally matched, in metal TO-5 can. Those were useful. Stopped being made about 30 years ago I think.
Clicking on "👍" and being number 222 to do it 😅