EEVblog 1599 - TOP 5 Jellybean Bipolar Transistors

[@kmkessler]

You need to go down the FET rabbit hole; I enjoy these jellybean videos.

[@0MoTheG]

2N7002, is there another?

[@StudioComposer]

Plenty 😅 ...Though not much spoken about JFETs these days. Brilliant for following high-Z crystal mics/pick-ups, self-biasing with a 10M to Gnd on the gate and a 1k on source. Still used in condenser mics for such reasons.

[@0MoTheG]

@@StudioComposer Same for PIR Sensors but those JFET are integrated and not suited for appreciable frequencies.

[@kmkessler]

@@0MoTheG I'm always on the lookout for something that is a better switch at 3.3V.

[@MrXenon1977]

Another definition of a Jellybean Component: A part that does not get more expensive after EEVblog was reporting about it 🙃

[@xjet]

BC107, 108, 109 was my go-to transistor for *many* years.

[@KeritechElectronics]

Same. Love those metal hat TO-18 enclosures and gold-plated leads! Still got a bunch in my lab.

[@hermannschaefer4777]

Yep, and I still have many, many BCxxx flying around - and BDxxx. Perhaps they never made it to down under. 2N... all this yankee stuff. And a BD249C can take 25A@100V Yes, I can still buy them (here) in numbers, but well, they are not available in Asia I guess.

[@nigeljohnson9820]

They were made obsolete, but were replaced by the ztx108.

[@DasIllu]

BC546, BC547 in my case. I always keep a few of them around for the "Uhm, i guess any transistor will do" jobs.

[@bobpitt1261]

@@hermannschaefer4777 We had lots of BC108, BC109 and BDs in Oz back to the early '70s.

[@chriscordingley4686]

Well you young people: In my hobby days it was Germanium OC71, OC81 OC44 (rf). And you could scrape the paint off an OC71 to make a phototransistor !

[@ethzero]

Fun fact: you could reset older model raspberry pis with a camera flash

[@TheOwlman]

_"And you could scrape the paint off..."_ Until they replaced the clear filler putty with blue and then sold the clear putty version as the OCP71 for 5 times the price! I still have half a dozen unused OC71s and one day I will find out if they have suffered from the dreaded whiskers that short them out internally.

[@ksbs2036]

Oh yeah! Reading Practical Electronics in the 60s-70s always had a couple of OC71 projects, or if you needed POWER then the OC81 🙂 with the little aluminum bracket

[@andymouse]

Oh what memories !

[@Boffin55]

Those were the days.. And I remember the old Greenweld shop on Milbrook Rd that had all the Vero offcuts (as the factory was up the road in Eastleigh)

[@KeritechElectronics]

Mine are BC547, 550 (for low noise applications), 847 (for SMT), 2N7000, IRF540 (for MOOSEFETs) and MPSA44 (for HV driving applications). Back in the '90s when I learned electronics, I mainly tinkered with BC107. They were around, salvaged from old electronics. Of course I played with 2N3055 too! Happened to build a transistor amp or two. First to watch... it's not 1080p yet!

[@Rob2]

Yes, those 2N types mentioned in the video were not popular here, we had the BC range with indeed types like BC107/8/9 BC237/8/9 BC547/8/9. For small MOSFETs the BS170. Being in Europe, we had most visibility of the European types.

[@volvo09]

Lucky 1080 guys.... I'm rural and 480 is the fastest I can stream 😂

[@KeritechElectronics]

@@Rob2 oh yes. Same for vacuum tubes... it's ECC83 here, none of that 12AX7 rubbish! Also worth noting is that the European diode and transistor marking system directly evolved from the Philips-Mullard vacuum tube marking system - it's just that the letters gained new meaning in the semiconductor context, the first letter was no longer heater voltage/current but semiconductor type (silicon, germanium, GaAs etc.). Some type markings have roughly close meanings, like A for detection diodes both tube and semiconductor, C for low power triodes and transistors, D for power triodes/transistors, F for pentodes and HF transistors, L for power pentodes and HF power transistors, Y for rectifier diodes...

[@absurdengineering]

MPSA44 are wide-base parts, quite linear. Good for all kinds of discrete analogue wizardry. Make for great current mirrors, differential pairs, etc.

[@fromgermany271]

BC107 was even in my electronics (kids) training kit in 1970.

[@SeanBZA]

Remember Elektor had always in the parts list the jellybean shown as TUN or TUP, and generally around once a year they had a few pages of what would work in either, a pretty long list of transistor types.

[@EEVblog]

I totally forgot to show off my old school transistor substitution book!

[@SeanBZA]

@@EEVblog Yes I wore a few of those out, and they came in very useful as well, especially with some of the more obscure devices. Think I still have a few badly dog eared copies around, plus some motorola data books, and others, that showed exactly what each die was used for, and that the differences between many were all due to sorting in manufacture, and the package used.

[@Zadster]

DUS DUG too! (Diode Universal Silicon / Germanium)

[@rtronicslab1253]

I also made one substitute book...lol...

[@petersage5157]

I first heard of TUP TUN DUG DUS in a Big Clive video about his Joule Thief. I love the concept of "if the datasheet says 'general purpose,' just whack it in there."

[@cashewmilkfan]

I like to use the tip41 & tip42 as fairly high power complementary pairs all the time and they are fairly common even at my local electronics component stores.

[@Zadster]

It may be just my perception, but it always seemed that US magazines/books used 2N2222, whereas European or UK ones used BC107/8/9 or 547.

[@ferrumignis]

That's because those are examples of the coding standards used in each continent, and therefore represented parts most easily available. Parts starting with a letter such as AF114 or BC108 use the European EEAC standard, the first letter indicates the semiconductor material (A=germanium, B=silicon), second letter indicates intended use (switching, audio amp, RF amp etc). 2N2222 is an example of the American JEDEC standard, first digit is the number of pins minus one (hence three pin transistors start with 2).

[@Bavarianscience]

That's actually a thing I'm noticing too. 2N2222 seems to be one of the most popular transistors in american hobbyists projects and general purpose stuff whereas here in the EU (germany to be specific) nearly everyone uses BC546...550 and BC556...560. Almost every electronics hobbyist here starts out with these BCs it seems.

[@pppjunk]

​@@BavarianscienceBack in the 1960's Philips in the EU made the BC107-8-9 family which became the European jellybean transistor family (the newer 547-8-9 are similar with plastic packages en.wikipedia.org/wiki/BC108_family ) ... In the US Fairchild and Motorola made the 2N types which became the US jellybeans... and of course the Japanese have theirs too lol

[@LazerLord10]

We use 2n2222's for lots of space stuff! In a fun little hermetic metal "sot23" looking thing. Gold plated case and everything!

[@sgtbrown4273]

Sweet 😮

[@echelonrank3927]

are they radiation hardened?

[@marcogenovesi8570]

@@echelonrank3927 do they need to? It's a pretty large transistor, afaik radiation is a problem for digital electronics where the transistors are nano scale and billions of transistors are on a few mm of silicon

[@echelonrank3927]

​@@marcogenovesi8570 hmmm, for low earth orbit probably not necessary

[@ve2zzz]

2N2222AUB (8 Canuck pesos on Digikey)... Quite costly, but wow, the look they provide on a PCB....

[@mysock351C]

I still remember picking up bags of 2N3904’s and 2N2222’s from RadioShack and Allied when they had actual stores you could go in. The higher gain variants of the BC547 and 557 I’ve used as drivers and voltage threshold detectors in audio amps for relay sequencing.

[@christaylor5613]

Fun, and always appreciate the speed, energy and enthusiasm! And when you sort of made that Mmmmmm, delicious, sound, that really reminded me of the way I feel when I go through a spec enjoying every little characteristic that a part has. Thank you Dave!

[@nicholasvinen]

Good call on the FZT458/558. For me the jellybean BJTs are BC807, BC817, BC846 and BC856. Through-hole equivalents are BC327, BC337, BC546 and BC556.

[@yukayuyu3844]

Glad to see another BC817 enjoyer in the wild - at this point I don't even bother using anything else unless I need more than half an amp of continuous current.

[@ChrisSmith-tc4df]

Only the 3904/3906, 2222/2907, and 3055/2955 resonated with me. The rest on the list were misses for me.

[@paulmoir4452]

But that's because we're ancient North American guys, I'm presuming? That SS8050 looks like a 2222 killer, and the 2222 has needed killing for a long time.

[@peterhaan9068]

At last, I finally recognized some part numbers on the channel! Ancient North American guy here!

[@echelonrank3927]

@@paulmoir4452 i used bc547 / bc557 in the 90s. made by motorala in usa.

[@zxborg9681]

2N3904/3906, 2N2222 and 2N3055, absolutely. Never worked with the others. I would have added TIP31C and its complementary friends, they were handy TO-220 packages for anything from small audio amps to little DC motor speed controllers.

[@TheHuesSciTech]

Hey, I'm just thrilled you mentioned my nostalgic BC547's 🙂! I was wondering if they were truly jellybean, or just randomly thrown in the Dick Smith Electronic Kits back in the day (from which I still have this irrational feeling that the BC547 is the one true NPN transistor)

[@eDoc2020]

BC547 is a European jellybean. The 2n parts are American jellybean.

[@VoidHalo]

I've always defaulted to 3904/3906s when using jellybean BJTs. I think it's because I like how well matched they are. I couldn't even speculate as to what the PNP equivalent of a 2222 is. That, and when I started off a few years ago, I bought like 500 3904s, not knowing what I was doing. Which is a bit much when you're only using breadboards at the time lol. I just like buying parts for the sake of having them. I don't even use half of the chips I've bought. They're there "just in case". I mean, you never know.

[@CutoutClips]

I've been looking forward to more of these jellybean videos.

[@ke9tv]

BC547 was hard to come by in the US during COVID. I wound up buying a bunch of 2N4401s and 2N4403s instead. Last time I needed medium current for a one-off, I needed about half an amp, and fished a 2N3053 out of my parts box, along with a little clip-on heat sink. I have absolutely no idea how old that thing was. I don't work with the higher voltages much, so I'll have to remember the 458/558 if I happen to need such a thing. Jellybean RF transistor would have to be the '5179, I think! The SOT-23 version is dirt cheap, 2 GHz transition frequency, other specs stink but maybe you don't need 'em. Lots of DIY ham gear uses it.

[@PileOfEmptyTapes]

Fun fact about 2N4403s: They have surprisingly low rbb' especially for a jellybean part, making them useful for low-impedance low-noise audio applications like the inputs of (dynamic) microphone preamps or MC prepres. In that sense they are the polar opposite of the other "low noise" school of transistors (BC550 and the like), which is high-beta types that keep working well to very low Ic.

[@JonnyMac351]

The BC327, BC337, BC546, BC556, BD139, BD140 ,Tip31 ,Tip32 , 2n3055 , 2n2955 are some of the more common i remember using in Australia through the 70's, 80's and 90's

[@davidsicking7514]

The 2N3055 came in vastly different trade-offs of hfe vsv ft and SOA. Ranged from ft of 800;KHz to 2 MHz. But the 800 KHz SOA was almost the full 115 Watts at its Vcb. The ft 2 MHz variant SOA started to have Second Breakdown dropoff at Vce of only 40 Volts. RCA introduced and JEDEC registered it before SOA was a regular item.

[@babbadge]

My personal favourites: MPSA42/92 NPN/PNP With VCE=300V!

[@EEVblog]

Yep, common as mud.

[@absurdengineering]

Yep, and with wide base. Lovely parts when you need something close to an ideal transistor in terms of ideality factor and linearity of response.

[@_2N2222]

What had to be mentioned was mentioned. Nothing to argue about. I enjoyed this video 👍

[@EEVblog]

Glad I could accomodate your fanboyism.

[@rianderous8761]

I was hoping to see some discussion on Darlington transistors in this video, or perhaps it could be a topic for the next top 5. Currently, I'm on the lookout for a Darlington transistor similar to the BD679 but available in an easy-to-solder surface-mount package for switching inductive loads with a µc I've been using the TSM2308CX MOSFET, but I've unfortunately destroyed a few of them. As Dave mentioned, BJTs can often withstand a bit more torture in certain applications.

[@danielaustin7643]

A few days ago I asked chat gpt about surface mount replacement for the tip122, it gave me a completely wrong answer every time, pointed towards a TO92 package instead

[@rianderous8761]

@@danielaustin7643 tried it as well, but clearly chatgpt is not trained on transistor datasheets

[@gamerpaddy]

2n3055 was allrounder king in to3 can days but havent seen them in to247 til this video and the BD brothers 140 and 139, for every small project. 2SC5200 and 2SA1943.. every power amp i worked on that used TO3P BJT's and had >100W/ch either used or work with these flawlessly just got a bunch of them now and grouped them for hFE gain to find the best matched pairs

[@andymouse]

Yeah "The BD Brothers" like it ! and the trany's as well.

[@urnoob5528]

funny thing is i have 2n3055 and tip2955 yeah, 2 different packages

[@WolfmanDude]

The BFU590GX is really cool to have if you want to work with high frequency stuff. I am a huge fan of that transistor!

[@Ziferten]

Re: FETs with BJT part numbers, Microchip has the VN2222.

[@EEVblog]

Ah yes, forgot that one.

[@zyghom]

when I was in the school, kind of hundreds years ago, the most common one were: BC107, BD139 and 2N3054 (to cover full range of power).

[@KeritechElectronics]

And BC211, and BD354... The memories :)

[@zyghom]

@@KeritechElectronics you are right - it wasn't 3054 but 354, and yes, 211 - bigger brother of 107 if I remember correctly, all in metal cases ;-)

[@marcogeri]

Hello Dave, Low voltage low current: BC846 / BC856 More current: MMBT2222 / MMBT2907 Mid power: BCX53 / BCX56 (sot 89) High voltage (160V): MMBT5551 / MMBT5401 High voltage (300V): MPSA92 / MPSA42 High power: TIP35 / TIP36 Small mosfets: BSS138 / BSS84

[@ChrisSmith-tc4df]

As transistors were manufactured locally about everywhere in the world, each major region ended up with their own jellybean part numbers.

[@geraldnjio2235]

35 years ago, the world was divided into four major regions. Some examples for small signal BJTs: Europe: BC107/177 , later BC547/557 USA: 2N3904/3906 Japan: 2SC945, A733 USSR: KT315/361 Today this division is not as relevant due to globalization (and there are only 3 regions left), but some people's preferences in the comments show where they started their hobby/profession.

[@manojms95]

Below are my favourites from THT era: Generic: BC547 / BC557 , 2N3906 / 2N3904 , 2SC1815 /2SA1015 , 2SC9014 / 2SC9015 , 2SC945 / 2SA733 Low noise: BC549 / BC559 High gain: 2SC3616 Low power RF: 2SC2570 , 2SC9018 Medium power: PBSS4350 / PBSS5350 , SS8050 / SS8550 , BD139/BD140 , 2SD882 / 2SB772 Low VceSat: 2SD1347 / 2SB985 Muting (high Vebo): 2SC2878

[@8bitMicroFan]

When you learn electronics in Europe, the BC54x NPN and BC55x PNP transistors are your "standard" ones. It doesn't matter what type you use, as long it gets the job done aka without turning into a light emitting transistor ;) .

[@klightspeed]

Same in the old Dick Smith Funway into Electronics 1 and 2 books (and kits they came with) I remember from the late 80's / early 90's (except with a different prefix than BC).

[@fromgermany271]

Having seen pictures of different dies with the same markings on, i would assume the manufacturers put on whatever marking meets the specs of the silicone and gives the highest margin. And I can’t see a problem with that. Would have been nice to concentrate on the real difference between US and European universal small power transistors, which could be the pinout, because that ruins diy experience.

[@8bitMicroFan]

@@fromgermany271 Yep, BC547 can be replaced with a 2N3904 (can handle double the collector current), but has a different pinout. Another trap is, that there are three sub variants of the BC547(A/B/C) which are binned based on the gain. The BC547C has higher gain than the 2N3904.

[@srenkoch6127]

Yep, totally agree.. I have used BC547 for 20+ years now for hobby projects and BC337/338 as well. For the slightly higher powers i have always used BD137 and for the really high currents (above 1 amp) I have always used 2N3055, those things are almost indestructible (as long as you remember the heat sink and the 10mOhm emitter resistor if you hook them up in parallel that is - Yes I have let out the magic smoke that way)

[@kstxevolution9642]

BC 547 and 557 were the only bjt's i could get at the local hardware store back in the day, so I became a 547 fanboy out of necessity

[@EEVblog]

Same here. BC574 was the staple in the 1970's and early 80's here.

[@fromgermany271]

I do it like the manufacturers, but vice versa. They put the marking on their silicone that (within specs) gives the biggest margin and I by out of the different flavors of numbering silicone, the one that gives me the best margin. 😂

[@kstxevolution9642]

@@EEVblog it was like that here in the early 2010s too

[@echelonrank3927]

i was poorer than that, so had to salvage transistors like 2sc2021 etc. out of discarded jap gear. then i tried some BC series. didnt end up using them, the gains were consistently low. talking to people who spent decades working with the crap revealed that the west never bothered to fully develop transistor tech like japan did.

[@Jimmeh_B]

My go to was always the BC548/558. Thanks to Tricky Dicky's "Fun Way 1" and "Fun Way 2" kits as a kid.

[@Agent24Electronics]

Same here!

[@pbs1516]

Hello Dave, this series is outstanding, please keep going! I think it is useful both for the hobbyist which just wants a part name to put over a function, and for the design engineer which has multi-sourcing constraints from their customer. I happen to be both, depending on the topic, so I would press like twice if it wasn't overflowing to zero. Thanks! (By the way, if I could suggest a next one... I believe optocouplers and maybe just diodes too would be appreciated)

[@northernwing8191]

Another one, I've always used the D44H series for higher power - D44H8 and D44H11 are 60/80V NPN, D45H8 and D45H11 are the complementary 60/80V PNP respectively. Might be starting to dry up though.

[@kentswan3230]

That was fun! Looking forward to your picking out jellybean components in other categories. Some of these are already in my libraries but I need to add the smaller packages and complementary parts in some cases. I'm going to go back through my libraries and review adds and updates for future projects. Thanks again.

[@jamesc7400]

I recall using the BFY51 on several occasions when additional current was needed beyond what the 2N2222 could provide. Not sure if it was Jellybean but was always readily available.

[@rafaelgcpp]

Back in my day, we had the TIP31 and TIP32 as jellybeans too. Now they're long gone...

[@Agent24Electronics]

Huh? The TIP31 is still in production

[@rafaelgcpp]

@@Agent24Electronics yep, but nowhere to be found, except for importing

[@GiNodrog]

I was brought up with my favourite BC107,8,9 , Tip31,32 and yes the brilliant 2N3055.

[@brucepickess8097]

Ahhhh, the 2N3055 what a transistor, you could fry an egg on it !!!!!!!😏🇬🇧

[@SilverGreen93]

As most Eastern Europeans, my first transistors were BC170, BD138, BD139, BC107, BC547... Never seen a 2N one before the late 90s.

[@hugobloemers4425]

Jellybean means a very wide variety of applications. So not only new product design but also repair and modifications. And the latter category includes field work. For that reason, in my opinion is a requirement for jellybean that a through hole version must be available.

[@ladyattis]

For lower frequency RF, 3904/3906 and the 2222 are good enough. Anything above 10-14 Mhz will be useless but then you're really dealing with those weirder RF BJTs that are too sensitive imo for amateur electronics work unless you really know your stuff. Like the 2sc5551 is out of production and it was one that you could tame with little effort but it's just becoming harder to find anything in the RF BJT lines that won't just turn into an oscillator.

[@richardbrobeck2384]

Yes the project that I am working on currently on my bench uses 3904 !!

[@labiadh_chokri]

Nice video I started my electronic experimentation 30 years ago with a bc107, ac127, bd137, and for higher current I used the famous 2n3055.

[@WhoWatchesVideos]

No way. I was _just_ looking today for cheap, reliable and available BJTs as a beginner hobbyist looking to finish my first from-scratch project.

[@exxosuk]

I've just unsoldered a 2N3904 lol... and the BC548 is the ultimate , best transistor ever :) BC337 is you want a bit more juice. and 2N3055 if you wanna start really cooking. TIP31/32 was also popular..

[@arvetemecha]

fun fact: the old school (mainly Ge) BJTs are valued items on ebay. Whatever makes them seen as junk by most of electronics professionnals is seeked by the fuzz pedal makers. Same thing for some discontinued JFETs. Their non-linearities and oddities are needed in some preamps, overdrive and distortion pedals. That and also some kind of weird cult :-)

[@urnoob5528]

I like 2n2222 But also have a lot of s9013 s9015 For medium power, i like them japanese 2sc2655 2sd882 2sb772, typically used to drive the bases of bigger power transistors For big power, tip41c tip42c For big big power, 3055 and 2955

[@wtfucrazy]

Love the Jellybean videos

[@HectorLopez-jw2ke]

Europe, Argentina are BC series 547,548 549,. And BD 139 140 2n3055.

[@IanScottJohnston]

My goto signal FETs back in the day were the ZVN3306A & ZVP0106A……..loved those, albeit prone to ESD damage if you weren’t careful during Pcb assembly.

[@roberthines2741]

for me in Canada with 120VAC mains, and for nixies, the pair I always used were the MPSA42/92 transistors, 300V max.

[@tubical71]

Over here bc 237/337 then bc 550/560 BD 139/140...and for sure the 3055..the 2955 was way later they instead did 'pseudo' complementary using 3055 at both sides and a PNP driver in front for the neg. Side I recently build a classic 3055 amp using ± 22 volt rails and four 3055. Dif pair input no current mirror, no current source but only a single resistor and a class A driver (bc 161-16) drivers (for that pseudo PP) and symmetrical supply to omit that ugly output cap... Nice one Dave, thanx 👍😊

[@Shrek_Holmes]

I'm surprised you didn't mention TIP31 and TIP32, personally I'm not a huge fan of them the gain is low but they are fairly common

[@andymouse]

Yep !

[@leongyokeloong5083]

Yes. You are right.

[@edmaster3147]

Thanks Dave, nice show. I'd love a show about the rarest of components, the most outragous specs. Somewhat of a electronics freak show.

[@EEVblog]

That would be interesting!

[@ve2zzz]

Also, about the 2222's. The metal can TO-18 2N2222 device uses bond wires in mid-air to connect the BJT's leads to silicon. Its counterpart TO-92 PN2222 is completely encapsulated in epoxy resin which includes the bond wires. Result: The TO-18 midair wires will act as fuses and will melt open in a mild overcurrent situation. In 99% of cases, the emitter will open. On their side, the TO-92 bond wires, covered in epoxy, will require a MUCH higher overcurrent to melt. In fact, Plastic devices will burn short, the silicon die shorting way before the bond wires open. In fact, a Plastic device will explode in case of extreme overcurrent situation.

[@todayonthebench]

The 2N2222 and its various flavors as far as packaging goes is a decent "all around" NPN transistor. Often I find myself in the situation that a couple of hundred mA of current is needed, and here that does rather well. But the 3904 is also a really good contender for lower power applications. Though, I normally don't specify specific parts, but rather minimum specifications and package. Ie, a SOT23 (cbe) NPN 28 Vce, 150 mA 5 MHz part can be a 2N2222 or a 3904 or a slew of other transistors. If a specific aspect has to be within a range, then specify said range. Now obviously one can't do this for every single transistor in a design, would make for a crazy schematics... But specifying minimum requirements is generally quite nice when one inevitably comes back to the design many years later and need to know if that random component one has on hand is a good replacement or not. By listing the minimum requirements then one knows rather quickly if it works or not.

[@noreverse1152]

Ordered a batch of boards turnkey from PCBWay. Customer in big hurry and cheapskate. Next day PCBWay emails list of short/long-lead parts. Among those MMBT3904 in SOT23. Back and forth, no way to pass the message that it is a jelly-bean part and it is impossible that they don't have 3904 available. I had to change to BC845

[@ksbs2036]

Obligatory comment to feed the algorithm. Thanks for these videos Dave. Great stuff

[@retrocomputeruser]

BC546-560, 2N2222-2907, MPSA42-92 are all jellybean. If Jellybean diodes are covered then the 1N4007 and 1N4148 have to be the top two surely.

[@ferrumignis]

1N914 used to be very common and is a mostly exact equivalent to 1N4148.

[@danmenes3143]

@@ferrumignis I don't know if it's true, but I've read that semiconductor suppliers today just make one part, and label it as "1N914" or "1N4148" depending on market demand. Demand persists for "1N914" because manufacturers would have to qualify a "different" part if they changed the BOM designation to "1N4148."

[@ferrumignis]

@@danmenes3143 I can easily believe it, hardly makes sense to make two parts that are pretty much identical.

[@eDoc2020]

@@danmenes3143 I think they do the same with the 1n400x parts.

[@EvilElmooo]

Yess I love this series, please continue

[@MrSupro]

I track parts for our company purchasing decisions and lots of discrete and logic IC parts have been eliminated from distributors inventories. Not that we can’t get them but selection and quantities are way way down and prices are way up.

[@carpandrei7493]

One thing I miss about metal can transistors, like 2N2222, is that you could cut the lid off and transform it into a (quite basic) light sensitive device that was quite useful long time ago...

[@ThirdPer3on]

WOW i have been using the Y1's from boards for little circuits. Good to know what it really is called. Thanks Batman.

[@dhpbear2]

Ah, I also see that the 3904 and 3906 make up a complimentary pair!

[@sc0or]

BC550 input, BC847 next, BD139 buffer, 2SC5200 an output, and IRFP240. These are the first idea comes to my mind. Of course MPSA18, 2n7002, 2n2222, 2n5551, 2n5486, and J111

[@RealRobotZer0]

MJE13007A were all over the flourescent lamp drivers and chinese PC PSU-s. (That is a high voltage part.)

[@Pawelr98]

2N3055 was manufactured by many various production plants around the world. I had ones from Tungsram (hungary, commie times), american RCA, Czechoslovakian Tesla and some other ones. Hungarian 2N3055 are prone to have low beta, around 30-50 at Ib=10mA, RCA ones were around 100, while Czechoslovakian ones (Motorola license), well above 100. I did an engineer's thesis by building a digital curve tracer and measuring static characteristics of various things I had available. And when I think low power, BC547/2N3904 in the signal amplifier use, 2N2222/BC337 as the low power switch, BD139 as the actual medium power amplifier/switch (12.5W, 1.5A) and then BD911/2N3055 for high power, non jellybean wise, 2SC5200 is a better choice, with some vintage Tesla KD502 (motorola licensed 2N3772) being very nice as well.

[@MattyEngland]

ZTX450 I recently replaced 85 of them on one board. Desoldering the old ones and cleaning the solder out the holes drove me nuts.

[@EEVblog]

Why did you have to raplace 85 trannies?

[@volvo09]

Wow! Bad batch? Must have been a special low production board?

[@MattyEngland]

@@EEVblog They were used on the motherboard for a 44 year old Fruit Machine I restored, mainly for driving lamps, but also for a few other circuits too. I kept having random ones fail, so decided to just replace the whole lot.

[@chriscordingley4686]

I worked at Ferranti in the 70's when they made the ZTX450. I see you can still get em from Diodes Inc, who still have a site in Oldham

[@volvo09]

@@MattyEngland ah, age makes sense with restoration.

[@ivolol]

2SC3356 for a jellybean RF transistor, up to 7ghz NPN and cheap / available from all sorts of OEMs.

[@FlyingShotsman]

I use the FMMT619 more often than the 617, as I find its higher Vce more useful than the 617's extra amp of Ice. Consider designing a small automotive or avionics module that has to be able to withstand an alternator load dump. If it needs a 3.3 or 5V power rail that doesn't have to be dead-nuts accurate, I can build a discrete power supply with a resistor, a 619 and a Zener that will easily ride out a load dump, will cost a few pennies and will be more than stable enough for most applications.

[@michaelmoorrees3585]

If you dig up an old datasheet on a 2N2222, it was pushed as a device for switching applications, not the general purpose role, its been used in, since. Personally, I use the 3904/3906 devices, and if little more current is needed, then the 4401/4403. What use to be jelly bean, only a few years ago, for high voltage, were the MPSA42 & MPSA92. But in the last 3 years or so, many manufacturers have dropped it. Though I still use them, they really can no longer be considered jelly bean parts.

[@andymouse]

Yeah and fast switching too.

[@electroquests]

Thanks Dave, I have been waiting for a jelly bean episode for a long time!

[@PowerElectronic]

This kind of videos are very valuable, Dave

[@chris-tal]

When I was a kid I happened to tear down a lot of dumpster dive derived consumer audio and RC toy stuff and they happened to be japanese (I was living far away from there) jellybean oriented. Those were mostly the 2SC945 and 2SC1815. I could see JIS stuff having a real "kanban" on their lettering and black/green color on high power stuff to denote PNP or NPN type junction. The town electronics store didn't really sell the low power 2N stuff for some reason (apart from 1N diodes) just the BC, BD, TIP, but especially the BC212. The guy might have grown up on the Philips stuff. I thought that BC212 is a jellybean part, but later I started speculating that the onwer might have just stocked up on too much of a single component. 🙃

[@nigeljohnson9820]

Surprising that some enterprising electronics supplier has not made up jellybean part bags for sale. I will be interested to see your choice of jellybean mosfets and jfets. For years my choice of enhancement mode mosfet was the 2N7002. I used it to interface to 5 volt logic. There are lots more low gate threshold mosfets in surface mount packages, than in leaded.

[@FunkyDisco79]

Why didn't you cover BC547/BC548 in a serious way? It's basically the same as 2N3904 and 2SC1815.

[@gordonlawrence1448]

One thing that nearly made me fall off my chair is that there is now a company that has restarted the BC108. That used to be a jellybean part 40 years ago.

[@jimreineri6166]

I am a big fan of the jelly bean series. Keep them coming.

[@SirMo]

Darlington transistors belonging in the jelly bean BJT category is probably debatable too. But yeah I got a bunch of 3904 (and 3906)s as well as some 2n2222s in my jelly bin stock. I wasn't all that familiar with other choices since I mostly just work on low power low voltage stuff. Thanks Dave!

[@EEVblog]

Thought about it, but I had too many already.

[@stevenbliss989]

Mosfets are tough, but there is 2N7000 & Si230x, AO3400 for starters. In spite of the "brand" numbers they are in fact made by MANY (mostly Asian) manufacturers! IRF3205 & IRFZ44 are runner ups, and YES multiple manufacturers like Vishay. The Si230x are used in SO MANY small devices,.

[@stevenbliss989]

OH MY GOD, I forgot the IRF840 and IRF260, also second sourced by Vishay, and likely others

[@qwaqwa1960]

Jellybean switching: MPS/2N2369 baby!!!

[@rtronicslab1253]

Wooiooooooo...all time favourite every transistors.... but didn't knew about MOSFET 3055...

[@garinanggara8358]

Nice video Dave!! I start to liking this segment. Can you pls do jellybean microcontrollers? Thanks Dave

[@volvo09]

An interesting video would be jellybean parts from "the old days" that are unobtanium but still in some demand. But i'm just a regular dude watching this for fun :)

[@hugobloemers4425]

I would like that as well, the AC178K / AC188K come to mind immediately. Who dares to buy them today? With all the fakes being offered.

[@gaborballa8566]

I was really looking forward to another jelly bean episode! 😃❤

[@AttilaAsztalos]

Used to be BC171/BC251, BD136/BD137, 2N3055. If it couldn't be done with one of these then it was radio frequency tier, which is just saying arcane magick. Or, if you wanna wind the dial even further back a bit: AC180/AC181, P401 etc...

[@ZomB1986]

Never heard of 3904. When you say jellybean, I say BC547/8/..., BC557/8/..., or BC850, BC860 for SMD. From Japanese products, I mainly salvaged C945, which I assume is jellybean.

[@eDoc2020]

You must be European. BCxxx = European, 2Nxxxx = American. It appears the 2SC parts like the 2SC945 are Japanese.

[@simonhopkins3867]

More jelly bean videos would be excellent.

[@vehasmaa]

Hey new episode in jellybeans... Still have bags of BC547/BC557 in my components box :P

[@petedeal8678]

Excellent video! I enjoyed it, thank you.

[@ElektronikLabor]

Thanks for the List 👍 It's helpful to have some Chicken Food trannies in your collection. Actually We used the FZT4 recently to switch mains voltages for a low power application

[@pepebricole4291]

Thanks for all the good stuff you put out! I just watched all jellybean videos. knew most of them but discovered some good ones. thanks! I'd really like something on DC/DC controllers. Does not sound like something you would do a JB video about. however we often need them and always end up with single source devices which is terrible. Don't know if there are aother devices like 34063, hopefully a bit better 🙂 MOS would also be nice.

[@MidlifeRenaissanceMan]

2SC945 and 2SC1815 for all that Japanese gear. 2SC372Ys are all through my old Yaesu FT101B where B is for Boat anchor

[@edinfific2576]

You were wrong on the SS8050: their Vce breakdown voltage is 25V, but the Vcb is 40V.

[@ve2zzz]

Bad souvenir about the 2222 (Plastic TO-92): Only having 2222's available for a project, i carefully built it with them to finally find it behaved bizzarely. Pretty low gain and significant leakage. After around 30 minutes of troubleshooting, i found the unimaginable: The BJT's Emitter and Collector leads were inverted !! In an JEDEC TO-92 device (base in center) ! I was so frustrated by such an amount of stupidity that i threw them in garbage without noting the brand, but i was 99% sure they were made out of Mandarium. Since then, i carefully check the datasheet before buying 2222's and yes, i prefer 3904's over them.

[@megadjc192]

BC547,BC557, 2n2222,2n2907,2n3904,2n3906. For FETs I use the J201, LND150, and 2n5457-9. I do mostly audio stuff so I use these the most. (Edit: I forgot about the KSA1381 and KSC3503 for medium power stuff).

[@zeddpilsner4]

more of these videos please!

[@user.A9]

2N2222 still available with metal case... What is the advantage of choosing that?

[@EEVblog]

In theory you could better thermally couple two devices. In practice, no reason.

[@ganopterygon]

Metal case will give you better thermal margin at the same power dissipation and ambient temperature due to its lower thermal resistance (junction to ambient) this might be important for high reliability applications.

[@andymouse]

Noise characteristics are good too.@@ganopterygon

[@threeMetreJim]

You can add a to18 heatsink (if you can find one) and get over 100mW at 100MHz if you are an oldschool fm radio pirate. Memories of the mid 1990's...

[@greg778123]

2n2222 has been my favorite in a lot of projects