MMBT3904LT1
TYPICAL AUDIO SMALL−SIGNAL CHARACTERISTICS
NOISE FIGURE VARIATIONS
(V
CE
= 5.0 Vdc, T
A
= 25°C, Bandwidth = 1.0 Hz)
12
10
NF, NOISE FIGURE (dB)
8
6
4
2
0
0.1
SOURCE RESISTANCE = 500
W
I
C
= 100
mA
0.2
0.4
1.0
2.0
4.0
10
20
40
100
SOURCE RESISTANCE = 200
W
I
C
= 1.0 mA
NF, NOISE FIGURE (dB)
SOURCE RESISTANCE = 200
W
I
C
= 0.5 mA
SOURCE RESISTANCE = 1.0 k
I
C
= 50
mA
14
f = 1.0 kHz
12
10
8
6
4
2
0
0.1
0.2
0.4
1.0
2.0
4.0
10
20
40
100
I
C
= 100
mA
I
C
= 1.0 mA
I
C
= 0.5 mA
I
C
= 50
mA
f, FREQUENCY (kHz)
R
S
, SOURCE RESISTANCE (k OHMS)
Figure 9.
Figure 10.
h PARAMETERS
(V
CE
= 10 Vdc, f = 1.0 kHz, T
A
= 25°C)
300
hoe, OUTPUT ADMITTANCE (
m
mhos)
5.0
10
100
50
20
10
5
2
1
0.1
0.2
0.3
0.5
1.0
2.0 3.0
I
C
, COLLECTOR CURRENT (mA)
5.0
10
h fe , CURRENT GAIN
200
100
70
50
30
0.1
0.2
0.3
0.5
1.0
2.0 3.0
I
C
, COLLECTOR CURRENT (mA)
Figure 11. Current Gain
20
h ie , INPUT IMPEDANCE (k OHMS)
10
5.0
10
7.0
5.0
3.0
2.0
Figure 12. Output Admittance
2.0
1.0
0.5
0.2
h re , VOLTAGE FEEDBACK RATIO (X 10
−4
)
5.0
10
1.0
0.7
0.5
0.1
0.2
0.3
0.5
1.0
2.0 3.0
I
C
, COLLECTOR CURRENT (mA)
5.0
10
0.1
0.2
0.3
0.5
1.0
2.0 3.0
I
C
, COLLECTOR CURRENT (mA)
Figure 13. Input Impedance
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Figure 14. Voltage Feedback Ratio
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