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BFP420F Datasheet, PDF (3/4 Pages) Infineon Technologies AG – NPN Silicon RF Transistor
SIEGET25 BFP420F
SPICE Parameters (Gummel-Poon Model, Berkley-SPICE 2G.6 Syntax) :
Transistor Chip Data
IS =
0.20045 fA
VAF = 28.383 V
BF =
IKF =
72.534 -
0.48731 A
NE = 2.0518 -
BR = 7.8287 -
VAR = 19.705 V
NC = 1.1724 -
RBM = 3.4849 
IKR = 0.69141 A
RB =
8.5757

RE = 0.31111
CJE = 1.8063 fF
VJE = 0.8051 V
TF =
6.7661 ps
XTF = 0.42199 -
ITF = 1
mA PTF = 0
deg
VJC = 0.81969 V
MJC = 0.30232 -
TR =
2.3249 ns
CJS = 0
F
MJS = 0
-
XTB = 0
-
XTI = 3
-
FC = 0.73234 -
C'-E'-Diode Data (Berkley-SPICE 2G.6 Syntax) :
IS =
3.5
fA N =
1.02
-
NF = 1.2432 -
ISE = 19.049 fA
NR = 1.3325 -
ISC = 0.019237 fA
IRB =
RC =
0.72983 mA
0.10105 
MJE = 0.46576 -
VTF = 0.23794 V
CJC = 234.53 fF
XCJC = 0.3
-
VJS = 0.75
V
EG = 1.11
eV
TNOM 300
K
RS = 10

All parameters are ready to use, no scaling is necessary
Package Equivalent Circuit:
C CB
L BO
B
L BI
C BE
B’ Transistor C’ L CI
Chip
E’
C’-E’-
Diode
L EI
L EO
E
LBO = 0.22 nH LBI = 0.42 nH
 LEO = 0.28 nH RLBI = 0.15
L CO
C
LCO = 0.22
KBO-EO = 0.10
nH LEI =
-
RLEI =
0.26
0.11
nH

KBO-CO = 0.01 -
LCI = 0.35 nH
C CE
KEO-CO = 0.11 -
 RLCI = 0.13
CBE = 34
fF KCI-EI = -0.05 -
CBC = 2
fF KBI-CI = -0.08 -
EHA07389
CCE =
33
fF KBI-EI = 0.20 -
Valid up to 6GHz
The TSFP-4 package has two emitter leads. To avoid high complexity of the package equivalent circuit,
both leads are combined in one electrical connection.
RLxI are series resistors for the inductances LxI and Kxa-yb are the coupling coefficients between
the inductances Lxa and Lyb. The referencepins for the coupled ports are B, E, C, B`, E`, C`.
For examples and ready to use parameters please contact your local Infineon Technologies
distributor or sales office to obtain a Infineon Technologies CD-ROM or see Internet:
http://www.infineon.com/silicondiscretes
3
Dec-07-2001