2SC2471
Silicon NPN Epitaxial
Application
UHF Amplifier
UHF TV Tuner, Local oscillator
Outline
1. Base
2. Emitter
3. Collector
TO-92 (2)
3
2
1
2SC2471
2
Absolute Maximum Ratings (Ta = 25C)
Item
Symbol
Ratings
Unit
Collector to base voltage
V
CBO
30
V
Collector to emitter voltage
V
CEO
30
V
Emitter to base voltage
V
EBO
3
V
Collector current
I
C
50
mA
Collector power dissipation
P
C
310
mW
Junction temperature
Tj
150
C
Storage temperature
Tstg
55 to +150
C
Electrical Characteristics (Ta = 25C)
Item
Symbol
Min
Typ
Max
Unit
Test conditions
Collector to base breakdown
voltage
V
(BR)CBO
30
--
--
V
I
C
= 10
A, I
E
= 0
Collector to emitter breakdown
voltage
V
(BR)CEO
30
--
--
V
I
C
= 1 mA, R
BE
=
Emitter to base breakdown
voltage
V
(BR)EBO
3
--
--
V
I
E
= 10
A, I
C
= 0
Collector cutoff current
I
CBO
--
--
100
nA
V
CB
= 24 V, I
E
= 0
Emitter cutoff current
I
EBO
--
--
100
nA
V
EB
= 2 V, I
C
= 0
Collector to emitter saturation
voltage
V
CE(sat)
--
--
300
mV
I
C
= 10 mA, I
B
= 5 mA
Base to emitter voltage
V
BE
--
--
0.95
V
V
CE
= 10 V, I
C
= 5 mA
DC current transfer ratio
h
FE
20
--
--
V
CE
= 10 V, I
C
= 5 mA
Gain bandwidth product
f
T
1000
2000
--
MHz
V
CE
= 10 V, I
C
= 5 mA
Collector output capacitance
Cob
--
0.9
1.5
pF
V
CB
= 10 V, I
E
= 0, f = 1 MHz
Base time constant
r
bb'
C
C
--
12
20
ps
V
CB
= 10 V, I
C
= 5 mA,
f = 31.8 MHz
2SC2471
3
150
100
50
Ambient Temperature Ta (
C)
0
400
300
200
100
Maximum Collector Dissipation Curve
Collector Power Dissipation P
C
(mW)
2
1
5
10
50
20
Collector Current I
C
(mA)
0
100
80
60
40
20
DC Current Transfer Ratio vs.
Collector Current
DC Current Transfer Ratio h
FE
V
CE
= 10 V
20
50
10
2
5
1
Collector Current I
C
(mA)
2,500
2,000
1,500
1,000
500
0
Gain Bandwidth Product vs.
Collector Current
Gain Bandwidth Product f
T
(MHz)
V
CE
= 10 V
50
1
2
5
10
20
Collector to Base Voltage V
CB
(V)
0.1
0.2
0.5
1.0
2
5
Collector Output Capacitance vs.
Collector to Base Voltage
Collector Output Capacitance C
ob
(pF)
f = 1 MHz
I
E
= 0
2SC2471
4
12
20
8
16
4
Collector Current I
C
(mA)
0
50
40
30
20
10
Base Time Constant vs.Collector Current
Best Time Constant r
bb'
C
C
(ps)
V
CB
= 10 V
f = 31.8 MHz
100
200
500
1,000
Frequency f (MHz)
100
50
20
10
5
2
0.5
0.2
0.1
1.0
Input Admittance vs. Frequency
Input Admittance y
ib
(mS)
b
ib
g
ib
V
CB
= 10 V
I
C
= 5 mA
Common Base
y
ib
= g
ib
+ jb
ib
1,000
500
200
100
Frequency f (MHz)
100
20
10
5
2
1.0
0.5
0.2
0.1
50
Output Admittance y
ob
(mS)
Output Admittance vs. Frequency
V
CB
= 10 V
I
C
= 5 mA
Common Base
y
ob
= g
ob
+ jb
ob
b
ob
g
ob
1,000
100
500
200
Frequency f (MHz)
100
60
40
20
0
20
40
60
80
100
80
Forward Transfer Admittance vs.
Frequency
Forward Transfer Admittance y
fb
(mS)
V
CB
= 10 V
I
C
= 5 mA
Common Base
y
fb
= g
fb
+ jb
fb
b
fb
g
fb
2SC2471
5
1,000
100
500
200
Frequency f (MHz)
4
2
0
2
4
6
Reverse Transfer Admittance vs.
Frequency
Reverse Transfer Admittance y
rb
(mS)
V
CB
= 10 V
I
C
= 5 mA
Common Base
y
rb
= g
rb
+ jb
rb
g
rb
b
rb
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