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MMBTH81 transistor model

kalias #68663 I am trying to create a model for the MMBTH81 transistor.? I extracted the following model from the datasheet and put it in a LTspice schematic with a directive. ? .MODEL MMBTH81? PNP(Is=10f Xti=3 + Eg=1.11 Vaf=100 Bf=133.8 Ise=1.678p + Ne=2.159 Ikf=.1658 Nk=.901 Xtb=1.5 Var=100 Br=1 + Isc=9.519n Nc=3.88 Ikr=5.813 Rc=7.838 Cjc=2.81p + Mjc=.1615 Vjc=.8282 Fc=.5 Cje=2.695p Mje=.3214 Vje=.7026 + Tr=11.32n Tf=97.83p Itf=69.29 Xtf=599u Vtf=10) ? The reason that I have picked this device is that it should provide a better gain bandwidth than a 3906.? However in my simulation I have two identical circuits and it seems as if the performance is the same.? Is there something wrong with this model? ? I compared the model file of this device to that of the 3906 and there appears to be something missing.? There is no Rb = or Re=.? Could this model be flawed or am I doing something incorrect? ? kalias
Helmut Sennewald All Messages By This Member #68668 Hello, Please try this model from Fairchild-Semi. Click on "RF Transistors". http://www.fairchildsemi.com/models/modelDetails?modelType=PSPICE#resultDiv Product: MMBTH81 Package: SOT-23 ** PNP RF Transistor ----------------------------------------------------------------- .model MMBTH81 pnp + IS=1.364229E-15???? BF=109?????????? NF=1????????????????? + ISE=1.59087E-16???? NE=2???????????? VAF=100 + ISC=5.8e-9????????? BR=0.48????????? IKR=0.85 + IKF=0.150527??????? RB=46.6????????? RBM=0.159?????? + IRB=1.51356E-6????? RE=0.23????????? RC=1.0???????????? + CJE=2.63E-12??????? VJE=0.80???????? MJE=0.335??????? + FC=0.5????????????? CJC=2.77E-12???? VJC=0.757??????? + MJC=0.158?????????? XTB=1.59999????? EG=0.86 + XTI=3?????????????? TF=97.83e-12???? ITF=69.29 + VTF=10????????????? XTF=599e-6 ----------------------------------------------------------------- Creation: Jan.-15-2009? rev: 1.0 Fairchild Semiconductor Best regards, Helmut
kalias #68670 Thanks Helmut, I took a look there but didn't see this model.? I ended up taking one from the datasheet. ? cheers ? kalias toggle quoted message Show quoted text On Mon, Dec 16, 2013 at 1:11 PM, <helmutsennewald@...> wrote: Hello, Please try this model from Fairchild-Semi. Click on "RF Transistors". Product: MMBTH81 Package: SOT-23 ** PNP RF Transistor ----------------------------------------------------------------- .model MMBTH81 pnp + IS=1.364229E-15???? BF=109?????????? NF=1????????????????? + ISE=1.59087E-16???? NE=2???????????? VAF=100 + ISC=5.8e-9????????? BR=0.48????????? IKR=0.85 + IKF=0.150527??????? RB=46.6????????? RBM=0.159?????? + IRB=1.51356E-6????? RE=0.23????????? RC=1.0???????????? + CJE=2.63E-12??????? VJE=0.80???????? MJE=0.335??????? + FC=0.5????????????? CJC=2.77E-12???? VJC=0.757??????? + MJC=0.158?????????? XTB=1.59999????? EG=0.86 + XTI=3?????????????? TF=97.83e-12???? ITF=69.29 + VTF=10????????????? XTF=599e-6 ----------------------------------------------------------------- Creation: Jan.-15-2009? rev: 1.0 Fairchild Semiconductor Best regards, Helmut
Helmut Sennewald All Messages By This Member #68672 Hello Kalias, Has this model better worked? Product: MMBTH81 Package: SOT-23 ** PNP RF Transistor ----------------------------------------------------------------- .model MMBTH81 pnp + IS=1.364229E-15???? BF=109?????????? NF=1????????????????? + ISE=1.59087E-16???? NE=2???????????? VAF=100 + ISC=5.8e-9????????? BR=0.48????????? IKR=0.85 + IKF=0.150527??????? RB=46.6????????? RBM=0.159?????? + IRB=1.51356E-6????? RE=0.23????????? RC=1.0???????????? + CJE=2.63E-12??????? VJE=0.80???????? MJE=0.335??????? + FC=0.5????????????? CJC=2.77E-12???? VJC=0.757??????? + MJC=0.158?????????? XTB=1.59999????? EG=0.86 + XTI=3?????????????? TF=97.83e-12???? ITF=69.29 + VTF=10????????????? XTF=599e-6 ----------------------------------------------------------------- Creation: Jan.-15-2009? rev: 1.0 Fairchild Semiconductor Best regards, Helmut

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