BF245A BF245B
http://onsemi.com
2
ELECTRICAL CHARACTERISTICS (TA
= 25
°C unless otherwise noted) (Continued)
Characteristic
Symbol
Min
Typ
Max
Unit
SMALL±SIGNAL CHARACTERISTICS
Forward Transfer Admittance (VDS
= 15 Vdc, V
GS
= 0, f = 1.0 kHz)
?Yfs?
3.0
D
6.5
mmhos
Output Admittance (VDS
= 15 Vdc, V
GS
= 0, f = 1.0 kHz)
?Yos?
D
40
D
mhos
Forward Transfer Admittance (VDS
= 15 Vdc, V
GS
= 0, f = 200 MHz)
?Yfs?
D
5.6
D
mmhos
Reverse Transfer Admittance (VDS
= 15 Vdc, V
GS
= 0, f = 200 MHz)
?Yrs?
D
1.0
D
mmhos
Input Capacitance (VDS
= 20 Vdc, ±V
GS
= 1.0 Vdc)
Ciss
D
3.0
D
pF
Reverse Transfer Capacitance (VDS
= 20 Vdc, ±V
GS
= 1.0 Vdc, f = 1.0 MHz)
Crss
D
0.7
D
pF
Output Capacitance (VDS
= 20 Vdc, ±V
GS
= 1.0 Vdc, f = 1.0 MHz)
Coss
D
0.9
D
pF
Cut±off Frequency(3)
(VDS
= 15 Vdc, V
GS
= 0)
F(Yfs)
D
700
D
MHz
3. The frequency at which gfs
is 0.7 of its value at 1 kHz.
f, FREQUENCY (MHz)
30
0.3
10
bis
@ I
DSS
f, FREQUENCY (MHz)
5.0
Figure 1. Input Admittance (yis) Figure 2. Reverse Transfer Admittance (yrs)
COMMON SOURCE CHARACTERISTICS
ADMITTANCE PARAMETERS
(VDS
= 15 Vdc, T
channel
= 25
°C)
f, FREQUENCY (MHz)
20
f, FREQUENCY (MHz)
10
Figure 3. Forward Transadmittance (yfs) Figure 4. Output Admittance (yos)
g
is
, INPUT CONDUCTANCE (mmhos)
20
10
0.5
0.7
1.0
2.0
3.0
5.0
7.0
20 30 50 70 100 200 300
500 700
1000
b
is
, INPUT SUSCEPTANCE (mmhos)
g
fs
, FORWARD TRANSCONDUCTANCE (mmhos)
|b
fs
|, FORWARD SUSCEPTANCE (mmhos)
g
rs
, REVERSE TRANSADMITTANCE (mmhos)
b
rs
, REVERSE SUSCEPTANCE (mmhos)
0.2
10 20 30 50 70 100 200 300
0.3
0.5
0.7
1.0
2.0
3.0
5.0
7.0
10
g
os
, OUTPUT ADMITTANCE (mhos)
b
os
, OUTPUT SUSCEPTANCE (mhos)
3.0
0.05
10 20 30 50 70 100 200 300
0.07
0.1
0.2
0.3
0.7
0.5
1.0
2.0
500 700
1000
500 700
1000
0.01
10 20 30 50 70 100 200 300
0.02
0.05
0.1
0.2
0.5
1.0
2.0
5.0
500 7001000
bis
@ 0.25 I
DSS
gis
@ I
DSS
gis
@ 0.25 I
DSS
brs
@ I
DSS
0.25 IDSS
grs
@ I
DSS, 0.25 IDSS
gfs
@ I
DSS
|bfs| @ IDSS
|bfs| @ 0.25 IDSS
bos
@ I
DSS
and 0.25 I
DSS
gos
@ I
DSS
gos
@ 0.25 I
DSS
gfs
@ 0.25 I
DSS
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