BF421 BF423

3

Motorola Small–Signal Transistors, FETs and Diodes Device Data

Figure 1. DC Current Gain

Figure 2. Capacitance

IC, COLLECTOR CURRENT (mA)

150

90

70

50

30

10

TJ = 25°C

VCE = 20 Vdc

F = 20 MHz

1

Figure 3. Current–Gain — Bandwidth

130

21

VR, REVERSE VOLTAGE (VOLTS)

0.1

100

0.1

10

1.0

10

1000

Cib @ 1MHz

100

1.0

Ccb @ 1MHz

IC, COLLECTOR CURRENT (mA)

1.4

0.0

1.2

1.0

0.8

0.6

0.4

0.2

100

10

0.1

1.0

110

35

7

9

19

17

15

13

11

VBE(on) @ 25°C, VCE = 10 V

VCE(sat) @ 25°C, IC/IB = 10

VBE(sat) @ 25°C, IC/IB = 10

VCE(sat) @ 125°C, IC/IB = 10

VCE(sat) @ –55°C, IC/IB = 10

VBE(sat) @ 125°C, IC/IB = 10

VBE(sat) @ –55°C, IC/IB = 10

VBE(on) @ 125°C, VCE = 10 V

VBE(on) @ –55°C, VCE = 10 V

Figure 4. ”ON” Voltages

IC, COLLECTOR CURRENT (mA)

300

0.1

1.0

10

250

200

150

0

TJ = +125°C

25

°C

–55

°C

VCE = 10 Vdc

100

50

100