2N3905 2N3906

4

Motorola Small–Signal Transistors, FETs and Diodes Device Data

TYPICAL AUDIO SMALL– SIGNAL CHARACTERISTICS

NOISE FIGURE VARIATIONS

(VCE = –5.0 Vdc, TA = 25°C, Bandwidth = 1.0 Hz)

Figure 7.

f, FREQUENCY (kHz)

2.0

3.0

4.0

5.0

1.0

0.1

Figure 8.

Rg, SOURCE RESISTANCE (k OHMS)

0

1.0

2.0

4.0

10

20

40

0.2

0.4

0

100

4

6

8

10

12

2

0.1

1.0

2.0

4.0

10

20

40

0.2

0.4

100

f = 1.0 kHz

IC = 1.0 mA

IC = 0.5 mA

IC = 50 mA

IC = 100 mA

SOURCE RESISTANCE = 200

W

IC = 1.0 mA

SOURCE RESISTANCE = 200

W

IC = 0.5 mA

SOURCE RESISTANCE = 2.0 k

IC = 100 mA

SOURCE RESISTANCE = 2.0 k

IC = 50 mA

h PARAMETERS

(VCE = –10 Vdc, f = 1.0 kHz, TA = 25°C)

Figure 9. Current Gain

IC, COLLECTOR CURRENT (mA)

70

100

200

300

50

Figure 10. Output Admittance

IC, COLLECTOR CURRENT (mA)

Figure 11. Input Impedance

IC, COLLECTOR CURRENT (mA)

Figure 12. Voltage Feedback Ratio

IC, COLLECTOR CURRENT (mA)

30

100

50

10

20

2.0

3.0

5.0

7.0

10

1.0

0.1

0.2

1.0

2.0

5.0

0.5

10

0.3

0.5

3.0

0.7

2.0

5.0

10

20

1.0

0.2

0.5

0.1

0.2

1.0

2.0

5.0

10

0.3

0.5

3.0

0.1

0.2

1.0

2.0

5.0

10

0.3

0.5

3.0

7

5

0.1

0.2

1.0

2.0

5.0

10

0.3

0.5

3.0

70

30

0.7

7.0

0.7

7.0

7.0

3.0

0.7

0.3

0.7

7.0

0.7

7.0