Semiconductor Group
1
Silicon N Channel MOSFET Tetrode
BF 997
q
Integrated suppression network against
spurious VHF oscillations
q
For VHF applications, especially in TV
tuners with extended VHF band,
e. g. in CATV tuners
Maximum Ratings
Type
Marking
Package
1)
Pin Configuration
BF 997
Q62702-F1055
MK
SOT-143
1
2
3
4
S
D
G
2
G
1
Ordering Code
(tape and reel)
Parameter
Symbol
Values
Unit
Drain-source voltage
V
DS
20
V
Thermal Resistance
Junction - soldering point
R
th JS
< 370
K/W
Total power dissipation,
T
S
< 76 C
P
tot
200
mW
Storage temperature range
T
stg
55 ... + 150
C
Gate 1/gate 2 peak source current
I
G1/2SM
10
Channel temperature
T
ch
150
mA
Drain current
I
D
30
1)
For detailed information see chapter Package Outlines..
07.94
BF 997
BF 997
Semiconductor Group
2
Electrical Characteristics
at
T
A
= 25 C, unless otherwise specified.
DC Characteristics
Unit
Values
Parameter
Symbol
min.
typ.
max.
V
Drain-source breakdown voltage
I
D
= 10
A,
V
G1S
=
V
G2S
= 4 V
V
(BR) DS
20
nA
Gate 1 source leakage current
V
G1S
= 5 V,
V
G2S
=
V
DS
= 0
I
G1SS
50
Gate 2 source leakage current
V
G2S
= 5 V,
V
G1S
=
V
DS
= 0
I
G2SS
50
Gate 1 source breakdown voltage
I
G1S
= 10 mA,
V
G2S
=
V
DS
= 0
V
(BR) G1SS
8.5
14
Gate 2 source breakdown voltage
I
G2S
= 10 mA,
V
G1S
=
V
DS
= 0
V
(BR) G2SS
8.5
14
V
Gate 1 source pinch-off voltage
V
DS
= 15 V,
V
G2S
= 4 V,
I
D
= 20
A
V
G1S (p)
2.5
Gate 2 source pinch-off voltage
V
DS
= 15 V,
V
G1S
= 0,
I
D
= 20
A
V
G2S (p)
2.0
mA
Drain current
V
DS
= 15 V,
V
G1S
= 0,
V
G2S
= 4 V
I
DSS
2
20
BF 997
BF 997
Semiconductor Group
3
Electrical Characteristics
at
T
A
= 25 C, unless otherwise specified.
AC Characteristics
Unit
Values
Parameter
Symbol
min.
typ.
max.
Gain control range
V
DS
= 15 V,
V
G2S
= 4 ... 2 V,
f
= 200 MHz
(test circuit)
G
ps
50
mS
Forward transconductance
V
DS
= 15 V,
I
D
= 10 mA,
V
G2S
= 4 V,
f
= 1 kHz
g
fs
15
18
Gate 2 input capacitance
V
DS
= 15 V,
I
D
= 10 mA,
V
G2S
= 4 V,
f
= 1 MHz
C
g2ss
1.2
pF
Output capacitance
V
DS
= 15 V,
I
D
= 10 mA,
V
G2S
= 4 V,
f
= 1 MHz
C
dss
1
Noise figure
V
DS
= 15 V,
I
D
= 10 mA
f
= 200 MHz,
G
G
= 2 mS,
G
L
= 0.5 mS
(test circuit)
F
1
pF
Gate 1 input capacitance
V
DS
= 15 V,
I
D
= 10 mA,
V
G2S
= 4 V,
f
= 1 MHz
C
g1ss
2.5
fF
Feedback capacitance
V
DS
= 15 V,
I
D
= 10 mA,
V
G2S
= 4 V,
f
= 1 MHz
C
dg1
25
dB
Power gain
V
DS
= 15 V,
I
D
= 10 mA
f
= 200 MHz,
G
G
= 2 mS,
G
L
= 0.5 mS
(test circuit)
G
ps
25
BF 997
BF 997
Semiconductor Group
4
Total power dissipation
P
tot
=
f
(
T
A
)
Gate 1 forward transconductance
g
fs1
=
f
(
V
G1S
)
V
DS
= 15 V,
I
DSS
= 10 mA,
f
= 1 kHz
Output characteristics
I
D
=
f
(
V
DS
)
V
G2S
= 4 V
Gate 1 forward transconductance
g
fs1
=
f
(
V
G2S
)
V
DS
= 15 V,
I
DSS
= 10 mA,
f
= 1 kHz
BF 997
BF 997
Semiconductor Group
5
Drain current
I
D
=
f
(
V
G1S
)
V
DS
= 15 V
Gate 2 input capacitance
C
g2ss
=
f
(
V
G2S
)
V
G1S
= 0 V,
V
DS
= 15 V
I
DSS
= 10 mA,
f
= 1 MHz
Gate 1 input capacitance
C
g1ss
=
f
(
V
G1S
)
V
G2S
= 4 V,
V
DS
= 15 V
I
DSS
= 10 mA,
f
= 1 MHz
Output capacitance
C
dss
=
f
(
V
DS
)
V
G1S
= 0 V,
V
G2S
= 4 V
I
DSS
= 10 mA,
f
= 1 MHz
BF 997
BF 997
Semiconductor Group
6
Gate 1 input admittance
y
11s
V
DS
= 15 V,
V
G2S
= 4 V
(common source)
Output admittance
y
22s
V
DS
= 15 V,
V
G2S
= 4 V
(common source)
Gate 1 forward transfer admittance
y
21s
V
DS
= 15 V,
V
G2S
= 4 V
(common source)
BF 997
BF 997
Semiconductor Group
7
Power gain
G
ps
=
f
(
V
G2S
)
V
DS
= 15 V,
V
G1S
= 0 V,
I
DSS
= 10 mA
f
= 200 MHz (see test circuit)
Test circuit for power gain and noise figure
f
= 200 MHz,
G
G
= 2 mS,
G
L
= 0.5 mS
Noise figure
F
=
f
(
V
G2S
)
V
DS
= 15 V,
V
G1S
= 0 V,
I
DSS
= 10 mA
f
= 200 MHz, (see test circuit)
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