Hi Guys,

i'm searching a spice model for the NPN BJT Transistor BFR194. I found the BFG194 and BFP194 (spice are identical) but not for 194. Can be used the BFP/BFG spice file to simulate BFR?

https://datasheetspdf.com/pdf-file/123709/SiemensSemiconductorGroup/BFR194/1

https://datasheetspdf.com/pdf/126427/SiemensSemiconductorGroup/BFG194/1

https://datasheetspdf.com/pdf-file/1289572/Infineon/BFP194/1

.MODEL BFG194 PNP(IS=4.574f ISE=2.1629E-14 ISC=7.8447E-18 XTI=3 BF=111.78 NR=0.43618 IKF=0.84785 IKR=0.012843 XTB=1.5 VAF=9.1007 VAR=1.7871 VJE=0.84843 VJC=0.71631 RE=0.15908 RC=0.10833 RB=4.1356 RBM=0.75304 IRB=6.1674E-5 CJE=1.7699E-14 CJC=3.5856p XCJC=0.063742 FC=0.90755 NF=0.66503 BR=92.296 NE=0.841 NC=1.6 MJE=0.48212 MJC=0.40003 TF=5.311E-11 TR=9.7481E-10 ITF=0.010453 VTF=0.10323 XTF=0.65766 EG=1.11 VCEO=20 ICRATING=100m MFG=SIEMENS)

.MODEL BFP194 PNP(IS=4.574f ISE=2.1629E-14 ISC=7.8447E-18 XTI=3 BF=111.78 NR=0.43618 IKF=0.84785 IKR=0.012843 XTB=1.5 VAF=9.1007 VAR=1.7871 VJE=0.84843 VJC=0.71631 RE=0.15908 RC=0.10833 RB=4.1356 RBM=0.75304 IRB=6.1674E-5 CJE=1.7699E-14 CJC=3.5856p XCJC=0.063742 FC=0.90755 NF=0.66503 BR=92.296 NE=0.841 NC=1.6 MJE=0.48212 MJC=0.40003 TF=5.311E-11 TR=9.7481E-10 ITF=0.010453 VTF=0.10323 XTF=0.65766 EG=1.11 VCEO=20 ICRATING=100m MFG=SIEMENS)

Alternatively in BFR194 PDF there's a textual SPICE Parameters which are:

IS = 4.574 fA
VAF = 9.1007 V
NE = 0.841 -
VAR = 1.7871 V
NC = 1.6 -
RBM = 4.1356 Ω
CJE = 17.699 fF
TF = 53.11 ps
ITF = 0.010453 mA
VJC = 0.71631 V
TR = 0.97481 ns
MJS = 0 -
XTI = 3 -
BF = 111.78 -
IKF = 0.84785 A
BR = 92.296 -
IKR = 0.012843 A
RB = 0.75304 Ω
RE = 0.15908 Ω
VJE = 0.84843 V
XTF = 0.65766 -
PTF = 0 deg
MJC = 0.40003 -
CJS = 0 fF
XTB = 0 -
FC = 0.90755 -
NF = 0.66503 -
ISE = 21.629 fA
NR = 0.43618 -
ISC = 0.0078447 fA
IRB = 0.061674 mA
RC = 0.10833 Ω
MJE = 0.48212 -
VTF = 0.10323 V
CJC = 3585.6 fF
XCJC = 0.063742 -
VJS = 0.75 V
EG = 1.11 eV
TNOM 300 K

The question is : Can be used the BFP/BFG spice file to simulate BFR? Alternatively can i use BFR194 textual data directly to create i spice .model removing the units of measure? From a quick check it seems to me that the spice data is the same for all three models and only the package changes.

 

See
.SUBCKT BFR194/INF 200 100 300
L1 1 10 0.85nH
L2 2 20 0.001nH
L3 3 30 0.69nH
C1 10 20 84fF
C2 20 30 165fF
C3 30 10 73fF
L4 10 100 0.51nH
L5 20 200 0.49nH
L6 30 300 0.61nH
Q1 2 1 3 BFR194
.MODEL BFR194 PNP(
+ IS = 4.574e-15 BF = 111.78 NF = 0.66503
+ VAF = 9.1007 IKF = 0.84785 ISE = 2.1629e-14
+ NE = 0.841 BR = 92.296 NR = 0.43618
+ VAR = 1.7871 IKR = 0.012843 ISC = 7.8447e-18
+ NC = 1.6 RBM = 0.75304 IRB = 6.1674e-05
+ RB = 4.1356 RE = 0.15908 RC = 0.10833
+ CJE = 1.7699e-14 VJE = 0.84843 MJE = 0.48212
+ TF = 5.311e-11 XTF = 0.65766 VTF = 0.10323
+ ITF = 0.010453 PTF = 0 CJC = 3.5856e-12
+ VJC = 0.71631 MJC = 0.40003 XCJC = 0.063742
+ TR = 9.7481e-10 CJS= 0 VJS = 0.75
+ MJS = 0 XTB = 0 EG = 1.11
+ XTI = 3 FC = 0.90755)
.ends

 

See

Thank you!

Unfortunately I have not yet understood if the .SUBCKT data can be interpreted by LTspice so I have excluded them (I hope they are not fundamental). I drew a simple circuit for LTspice for comparison of tree model and the output is the same.
I didn't understand why the circuit produces no gain. I'm attaching it if anyone wants to understand why. Thanks again!.

 

You used a signal source to set the wrong mode for the transistors. The voltage on the bases is 0 volts. To correct this you need to put isolation capacitors in the circuit. Your circuits are voltage repeaters and they do not amplify the signal in amplitude!

 

You used a signal source to set the wrong mode for the transistors. The voltage on the bases is 0 volts. To correct this you need to put isolation capacitors in the circuit. Your circuits are voltage repeaters and they do not amplify the signal in amplitude!

So it can used directly like a current buffer!