Spice model BFS17

The BFS17 is a nice transistor, fast but not too fast.

John

And cheap. I am just puzzled about the Spice model for it. So far I have always just built the stuff but this time some of the "miscellaneous" parts are not right here on my desk so it has to be a sim.

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Regards, Joerg

http://www.analogconsultants.com/

"Joerg" schrieb im Newsbeitrag news:g5A8j.5929$ snipped-for-privacy@newssvr22.news.prodigy.net...

Hello Hoerg,

Google is your friend.

Google: BFS17 SPICE model

Maybe there are more useful hits.

Best regards, Helmut

That's one of the reasons why I am puzzled. There are quite a few differences between the NXP Spice model (the one that is supposedly based on the old BFW92) and the Zetex model. So which one would be closer to reality?

--
Regards, Joerg

http://www.analogconsultants.com/

How does this model compare?

.MODEL BFS17 NPN BF=93 BR=25 CJC=1.54E-12 CJE=1.18E-12

• IKF=.055 IKR=.01 IRB=5E-4 IS=4.9E-16 ISC=4.5E-15 ISE=1E-14

• ITF=2.3 MJC=.25 MJE=.4 NC=1.2 NE=1.800 NF=.993 NR=1.005

• RB=7 RBM=.5 RC=2.0 RE=.5 TF=5E-11 TR=2.4E-8 VAF=90 VAR=6

• VJC=.559 VJE=1.12 XTF=100

Really close to the Zetex model but farther away from the NXP model.

--
Regards, Joerg

http://www.analogconsultants.com/

Please post all three... I like to amuse myself seeing how each was derived ;-)

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
         America: Land of the Free, Because of the Brave

Ok, Win's is right above.

Zetex: .MODEL BFS17 NPN IS =4.9E-16 NF =.993 BF =93 VAF=90 IKF=.055

• ISE=1E-14 NE =1.800 BR =25 VAR=6 NR =1.005 IKR=.01

• ISC=4.5E-15 NC =1.2 RB =7 RBM=.5 IRB=5E-4 RE =.5

• RC =2.0 TF =5E-11 XTF=100 ITF=2.3 TR =2.4E-8

• CJE=1.18E-12 CJC=1.54E-12 VJC=.559 MJC=.25 VJE=1.12

• MJE=.4

Philips/NXP: .MODEL DBFS17 NPN

• IS = 3.157E-16

• BF = 102

• NF = 0.9953

• VAF = 28

• IKF = 0.12

• ISE = 4.184E-15

• NE = 1.623

• BR = 46

• NR = 0.9952

• VAR = 9

• IKR = 0.022

• ISC = 1.004E-15

• NC = 1.108

• RB = 4

• IRB = 8E-05

• RBM = 4

• RE = 0.55

• RC = 2

• XTB = 0

• EG = 1.11

• XTI = 3

• CJE = 9.45E-13

• VJE = 0.676

• MJE = 0.2361

• CJC = 1.1E-12

• VJC = 0.5166

• MJC = 0.2761

• XCJC = 0.4

• TF = 6.7E-11

• XTF = 150

• VTF = 0.6

• ITF = 0.75

• PTF = 21

• TR = 1E-09

• FC = 0.96

--
Regards, Joerg

http://www.analogconsultants.com/

Thanks, I'll churn them thru my checker.

...Jim Thompson

--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
|       http://www.analog-innovations.com           |    1962     |
             
         America: Land of the Free, Because of the Brave

Both parameter sets seem pretty close to me (there's probably more variations from unit to unit) but it seems NXP have been more careful: they got the trouble to model Ft dependency on Vce which not so frequent and excess phase which I find extremly rare.

You can run two benches and compare with the DS.

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Thanks,
Fred.

NXP's datasheet is a bit skimpy but they usually do take care of their models. Now if they only got a better web design team.

It's a marvelous transistor, very cheap, has been good to me since the

80's. I noticed that it did creep up in price since then but definitely still worth it.

--
Regards, Joerg

http://www.analogconsultants.com/