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Power Dissipation vs
Ambient Temperature
0 25 50 75 100 125 150
0
0.25
0.5
0.75
1
TEMPERATURE ( C)
P - POWER DISSIPATION (W)
D
o
SOT-223
SOT-23
TO-92
Typical Characteristics (continued)
Noise Figure vs Frequency
0.1 1 10 100
0
2
4
6
8
10
12
f - FREQUENCY (kHz)
NF - NOISE FIGURE (dB)
V = 5.0V
CE
I = 100
µ
A, R = 500
Ω
C
S
I = 1.0 mA
R = 200
Ω
C
S
I = 50
µ
A
R = 1.0 k
Ω
C
S
I = 0.5 mA
R = 200
Ω
C
S
k
Ω
Noise Figure vs Source Resistance
0.1 1 10 100
0
2
4
6
8
10
12
R - SOURCE RESISTANCE ( )
NF - NOISE FIGURE (dB)
I = 100
µ
A
C
I = 1.0 mA
C
S
I = 50
µ
A
C
I = 5.0 mA
C
θ
- DEGREES
0
40
60
80
100
120
140
160
20
180
Current Gain and Phase Angle
vs Frequency
1 10 100 1000
0
5
10
15
20
25
30
35
40
45
50
f - FREQUENCY (MHz)
h - CURRENT GAIN (dB)
θ
V = 40V
CE
I = 10 mA
C
h
fe
fe
Turn-On Time vs Collector Current
110100
5
10
100
500
I - COLLECTOR CURRENT (mA)
TIME (nS)
I = I =
B1
C
B2
I
c
10
40V
15V
2.0V
t
@
V = 0V
CB
d
t
@
V = 3.0V
CC
r
Rise Time vs Collector Current
1 10 100
5
10
100
500
I - COLLECTOR CURRENT (mA)
t - RISE TIME (ns)
I = I =
B1
C
B2
I
c
10
T = 125°C
T = 25°C
J
V = 40V
CC
r
J
2N4123
NPN General Purpose Amplifier
(continued)