Connect with us

Hello, can somebody help wich transistor is like bfg520

Discussion in 'Radio and Wireless' started by michael1978, Jul 27, 2018.

  1. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Halo,
    i am working on oscillator in multisim, but in database in multisim they dont have this transistor
    can somebody help to find equivalen transistor please.... for multisim thanks
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    24,860
    2,571
    Jan 21, 2010
    Is this oscillator working up to the GHz range? The ft (Transition Frequency) of this transistor is 9GHz.

    if an ft of 6GHz is OK, then you could try this. The package is different so you'll have to do a bit of redesign of the board. There are others at Digikey. Other suppliers may have different stocked parts.
     
  3. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    I dont find in multisim, and also is for 88MHZ-108MHZ, I found in internet local oscillator
     
  4. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    is for frequency 88MHZ -108MHZ
     
  5. BobK

    BobK

    7,380
    1,559
    Jan 5, 2010
    For 100MHz you could try a BF199, which is a common one.

    Bob
     
  6. kellys_eye

    kellys_eye

    4,289
    1,143
    Jun 25, 2010
    Isn't that one obsolete now?

    Either way, if you use some supplier websites and their parametric search function, some sites even have multisim files for the devices (iirc).
     
  7. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Hello, i dont find in multisim bf199, something else maybe?
     
  8. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Sorry but i realy dont know, i am searching on internet to find equivalent transistor bfg220, but i dont find nothing because first i search on internet, after i come here to ask for help
     
  9. BobK

    BobK

    7,380
    1,559
    Jan 5, 2010
    Well, why don't you tell us what RF transistors are available in multisym, then?

    Bob
     
  10. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    There are a lot,
     
  11. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    YOU HAVE A LIST MASTERDATABASE
     
  12. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    whait BFG235, BFG19S? BFG196, BGF193, BFG135A? but to the list of npn or pnp they are a lotttt
     
  13. BobK

    BobK

    7,380
    1,559
    Jan 5, 2010
    Well, look at the specs of the BFG520 then at the BFG transistors you have access to. Pick one that is close.

    Bob
     
  14. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Is possible to put the schematic, because it was not so good picture in document maybe i make mistake….
     
  15. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    i pick up BFG235, but is not working
     
  16. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    is possible that i make mistake because the picture was not so good in document
     
  17. WHONOES

    WHONOES

    564
    111
    May 20, 2017
    If your Multisim uses the spice platform, Try the model below.
    You should be able to copy and paste into you program!

    From: C:\Program Files (x86)\SIMetrix-SIMPLIS Elements_810\support\Models\bipolar.lb, line 143



    *From Philips SC04 "Small signal transistors 1991" and NS Discrete 1978

    * Base resistance not modelled - no info. CBE estimated. Vce(sat) estimated.

    .model BF199 npn ( IS=1.61E-15 VAF=35.8 BF=150 IKF=0.0467 NE=1.3552

    + ISE=1.494E-14 IKR=0.001 ISC=1.00E-14 NC=1.5 NR=1 BR=5 RC=10 CJC=5.00E-13

    + FC=0.5 MJC=0.2 VJC=0.8 CJE=5.00E-12 MJE=0.4 VJE=0.6 TF=1.86E-10

    + ITF=0.045 VTF=3 XTF=50 RE=1)
     
    michael1978 likes this.
  18. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    This is the close one BFG234
     
  19. michael1978

    michael1978

    388
    2
    Mar 17, 2012
    Thnx for help but i use LTSPICE and multisim
     
  20. WHONOES

    WHONOES

    564
    111
    May 20, 2017
    LTSPICE uses a version of Spice so will probably work.
    I use Simetrix Elements which is the best simulator I have ever come across. The BF199 is in my model data base. Simetrix Elements is free to down load but has a limitation on the number of nodes. That has only ever been a limiting factor on very large sim's that I have tried.
     
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.