2SC1344, 2SC1345
Silicon NPN Epitaxial
ADE-208-1052A (Z)
2nd. Edition
Mar. 2001
Application
Low frequency low noise amplifier
Outline
TO-92 (1)
1. Emitter
2. Collector
3. Base
3
2
1
2SC1344, 2SC1345
Absolute Maximum Ratings
(Ta = 25°C)
Item
Collector to base voltage
Collector to emitter voltage
Emitter to base voltage
Collector current
Collector power dissipation
Junction temperature
Storage temperature
Symbol
V
CBO
V
CEO
V
EBO
I
C
P
C
Tj
Tstg
2SC1344
30
30
5
100
200
150
–55 to +150
2SC1345
55
50
5
100
200
150
–55 to +150
Unit
V
V
V
mA
mW
°C
°C
Electrical Characteristics
(Ta = 25°C)
2SC1344
Item
Collector to base
breakdown voltage
Collector to emitter
breakdown voltage
Emitter to base
breakdown voltage
Collector cutoff current
Emitter cutoff current
Symbol
V
(BR)CBO
V
(BR)CEO
V
(BR)EBO
I
CBO
I
EBO
Min
30
30
5
—
—
250
—
—
—
—
—
—
Note:
D
250 to 500
Typ
—
—
—
—
—
—
—
—
230
—
—
—
Max
—
—
—
0.5
0.5
2SC1345
Min
55
50
5
—
—
Typ
—
—
—
—
—
—
—
—
230
—
—
—
Max
—
—
—
0.5
0.5
1200
0.75
0.5
—
3.5
8
1
V
V
MHz
pF
dB
dB
Unit
V
V
V
µA
µA
Test conditions
I
C
= –10
µA,
I
E
= 0
I
C
= 1 mA, R
BE
=
∞
I
E
= 10
µA,
I
C
= 0
V
CB
=18 V, I
E
= 0
V
EB
= 2 V, I
C
= 0
V
CE
= 12 V, I
C
= 2 mA
V
CE
= 12 V, I
C
= 2 mA
I
C
= 10 mA, I
B
= 1 mA
V
CE
= 12 V, I
C
= 2 mA
V
CB
= 10 V, I
E
= 0,
f = 1 MHz
V
CE
= 6 V, I
C
= 0.1 mA,
f = 10 Hz, R
g
= 10 kΩ
V
CE
= 6 V, I
C
= 0.1 mA,
f = 1 kHz, R
g
= 10 kΩ
DC current transfer ratio h
FE
*
1
Base to emitter voltage V
BE
Collector to emitter
saturation voltage
V
CE(sat)
1200 250
0.75
0.5
—
3.5
8
1
—
—
—
—
—
—
Gain bandwidth product f
T
Collector output
capacitance
Noise figure
Cob
NF
1. The 2SC1344 and 2SC1345 are grouped by h
FE
as follows.
E
400 to 800
F
600 to 1200
2
2SC1344, 2SC1345
Small Signal h Parameters
(V
CE
= 5V, I
C
= 0.1 mA, f = 270 Hz, Ta = 25°C, Emitter
common)
Item
Input impedance
Voltage feedback ratio
Current transfer ratio
Output admittance
Symbol
hie
hre
hfe
hoe
D
110
9.5
340
12.0
E
170
14.5
540
12.5
F
240
16
825
13.5
µS
Unit
kΩ
×
10
–4
Maximum Collector Dissipation Curve
Collector Power Dissipation P
C
(mW)
250
10
Collector Current I
C
(mA)
200
8
150
6
100
4
2
50
Typical Output Characteristics
P
C
=
26
20
0m
24
W
22
20
18
16
14
12
10
8
6
4
2
µA
I
B
= 0
4
8
12
16
20
Collector to Emitter Voltage V
CE
(V)
24
0
100
150
50
Ambient Temperature Ta (°C)
0
DC Current Transfer Ratio vs.
Collector Current
700
DC Current Transfer Ratio h
FE
V
CE
= 12 V
600
Collector Current I
C
(mA)
4
5
Typical Transfer Characteristics
V
CE
= 12 V
500
Ta
=
C
75
°
3
400
25
2
300
1
200
0.01 0.02 0.05 0.1 0.2 0.5 1.0 2
5 10 20
Collector Current I
C
(mA)
50
0
0.6
0.8
1.0
0.2
0.4
Base to Emitter Voltage V
BE
(V)
3
2SC1344, 2SC1345
Base to Emitter Voltage vs. Ambient
Temperature
Collector Output Capacitance C
ob
(pF)
0.9
Base to Emitter Voltage V
BE
(V)
V
CE
= 12 V
I
C
= 2 mA
Collector Output Capacitance vs.
Collector to Base Voltage
10
I
E
= 0
f= 1 MHz
5
0.8
0.7
0.6
2
0.5
0.4
–20
1
1
5
10
2
Collector to Base Voltage V
CB
(V)
0
20
40
60
Ambient Temperature Ta (°C)
80
Emitter Input Capacitance vs.
Emitter to Base Voltage
10
Emitter Input Capacitance C
ie
(pF)
Signal Source Resistance R
g
(kΩ)
I
C
= 0
f= 1 MHz
5
100
Contours of Constant Noise Figure
1
dB
10
dB
8
dB
6 dB
4
B
2 d
dB
1
dB
2
30
2
dB
4
10
dB
6d
B
3
8
dB
10
dB
1.0
0.3
0.1
0.001 0.003 0.01
V
CE
= 6 V
f = 10 Hz
1
1
5
2
Emitter to Base Voltage V
EB
(V)
10
0.03
0.1
0.3
1.0
3.0
Collector Current I
C
(mA)
4
2SC1344, 2SC1345
Contours of Constant Noise Figure
100
Signal Source Resistance R
g
(kΩ)
Signal Source Resistance R
g
(kΩ)
V
CE
= 6 V
f = 120 Hz
100
30
10
V
CE
= 6 V
f = 1 kHz
Contours of Constant Noise Figure
10
8
dB
6
dB
dB
dB
8
dB
6
dB
4
30
4
2
10
4
2
dB
dB
1
2
d
6
B
dB
8
dB
dB
1
3
1
dB
dB
dB
dB
1
dB
3
1.0
0.3
2
1.0
0.3
dB
dB
8
10
dB
dB
6
4
dB
0.1
0.001 0.003 0.01
0.03
0.1
0.3
1.0
3.0
0.1
0.001 0.003 0.01
0.03
0.1
0.3
1.0
3.0
Collector Current I
C
(mA)
Collector Current I
C
(mA)
Noise Figure vs. Frequency
12
10
Noise Figure NF (dB)
8
6
4
2
0
10
20
50
100
200
500
1k
Frequency f (Hz)
V
CE
= 6 V
I
C
= 0.1 mA
R
g
= 10 kΩ
10
8
Noise Figure vs. Collector to
Emitter Voltage
Noise Figure NF (dB)
I
C
= 0.1 mA
f = 10 Hz
R
g
= 10 kΩ
6
4
2
0
1
2
5
10
20
50
Collector to Emitter Voltage V
CE
(V)
5
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