The TOP 5 Jellybean Bipolar Junction Transistors (BJT)
00:00 - What is a Jellybean Component?
01:30 - Low Power BJT: 2N3904 / 3906, SMD Marking 1A
06:49 - 2N2222
08:52 - BC547 fanboys
09:28 - Medium Power BJT: FMMT617-619 / 717-719
12:27 - SS8050 / 8550
15:08 - High Power BJT: 2N3055 / 2955
17:09 - Sneaky MOSFET, and the differences from BJT's
19:30 - High Voltage BJT: FZT458 / 558, FMMT458/558
Jellybean Series Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHv268f0mW5m1t_hq_RVGRSA
Forum: https://www.eevblog.com/forum/blog/eevblog-1599-top-5-jellybean-bipolar-transistors/
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By YTB

20 thoughts on “Eevblog 1599 – top 5 jellybean bipolar transistors”
  1. Avataaar/Circle Created with python_avatars @pepebricole4291 says:

    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 ๐Ÿ™‚
    MOS would also be nice.

  2. Avataaar/Circle Created with python_avatars @AttilaAsztalos says:

    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…

  3. Avataaar/Circle Created with python_avatars @jimreineri6166 says:

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

  4. Avataaar/Circle Created with python_avatars @megadjc192 says:

    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).

  5. Avataaar/Circle Created with python_avatars @user-lo8gq3pr6e says:

    OMG, you have 3 mouse cursors on top of each other. What screen recording software are you using? I may want to investigate this…

  6. Avataaar/Circle Created with python_avatars @ve2zzz says:

    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.

  7. Avataaar/Circle Created with python_avatars @ve2zzz says:

    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.

  8. Avataaar/Circle Created with python_avatars @RealRobotZer0 says:

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

  9. Avataaar/Circle Created with python_avatars @JSMCPN says:

    SCUBA Apparatus

  10. Avataaar/Circle Created with python_avatars @chris-tal says:

    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. ๐Ÿ™ƒ

  11. Avataaar/Circle Created with python_avatars @halonothing1 says:

    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.

  12. Avataaar/Circle Created with python_avatars @halonothing1 says:

    I've only been into hobbyist electronics for a few years, and I've always wondered, jellybean transistors seem pretty much the same, aside from a few very slight differences maybe. So, why have so many different transistors that essentially have the exact same functionality? For example, is there ANY case you guys can think of where using a 2222 over a 3904 would be necessary? Or even beneficial in any way.

  13. Avataaar/Circle Created with python_avatars @MB-st7be says:

    They've stopped making the classic metal can TO-3 3055. Only grey market available now ๐Ÿ™

  14. Avataaar/Circle Created with python_avatars @pandziesonty9943 says:

    BDX53C is a high power high gain jellybean for me. For rf stuff, at least the PA stage it's RD16HHF1.

  15. Avataaar/Circle Created with python_avatars @edinfific2576 says:

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

  16. Avataaar/Circle Created with python_avatars @gordonlawrence1448 says:

    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.

  17. Avataaar/Circle Created with python_avatars @technoman9000 says:

    Cool, now do unijunction transistors next

  18. Avataaar/Circle Created with python_avatars @Dmitry633 says:

    Do Mosfets !

  19. Avataaar/Circle Created with python_avatars Hola! @TzOk says:

    For me a jellybean low-power BJT is BC547, coz I'm from the EU ๐Ÿ˜‰ And if I need slightly more current I go for BC337.

  20. Avataaar/Circle Created with python_avatars @SilverGreen93 says:

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

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