Hello, can somebody help wich transistor is like bfg520

[michael1978]

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

 

[(*steve*)]

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.

 

[michael1978]

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.

I dont find in multisim, and also is for 88MHZ-108MHZ, I found in internet local oscillator

 

[michael1978]

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.

is for frequency 88MHZ -108MHZ

 

[BobK]

For 100MHz you could try a BF199, which is a common one.

Bob

 

[kellys_eye]

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).

 

[michael1978]

For 100MHz you could try a BF199, which is a common one.

Bob

Hello, i dont find in multisim bf199, something else maybe?

 

[michael1978]

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).

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

 

[BobK]

Well, why don't you tell us what RF transistors are available in multisym, then?

Bob

 

[michael1978]

Well, why don't you tell us what RF transistors are available in multisym, then?

Bob

There are a lot,

 

[michael1978]

There are a lot,

YOU HAVE A LIST MASTERDATABASE

 

[michael1978]

Well, why don't you tell us what RF transistors are available in multisym, then?

Bob

whait BFG235, BFG19S? BFG196, BGF193, BFG135A? but to the list of npn or pnp they are a lotttt

 

[BobK]

Well, look at the specs of the BFG520 then at the BFG transistors you have access to. Pick one that is close.

Bob

 

[michael1978]

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

Is possible to put the schematic, because it was not so good picture in document maybe i make mistake….

 

[michael1978]

Well, look at the specs of the BFG520 then at the BFG transistors you have access to. Pick one that is close.

Bob

i pick up BFG235, but is not working

 

[michael1978]

i pick up BFG235, but is not working

is possible that i make mistake because the picture was not so good in document

 

[WHONOES]

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]

Well, look at the specs of the BFG520 then at the BFG transistors you have access to. Pick one that is close.

Bob

This is the close one BFG234

 

[michael1978]

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)

Thnx for help but i use LTSPICE and multisim

 

[WHONOES]

Thnx for help but i use LTSPICE and multisim

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.