BC447 datasheet(4/6 Pages) ONSEMI

4 / 6 page

BC447, BC449, BC449A

http://onsemi.com

Figure 7. Collector Saturation Region

Figure 8. Base-Emitter Temperature

Coefficient

IC, COLLECTOR CURRENT (mA)

IB, BASE CURRENT (mA)

100

0.2

1.0

2.0

5.0

200

0.1

0.05

2.0

1.6

1.2

0.8

0.4

1.0

TJ = 25°C

IC =

100 mA

IC =

50 mA

IC =

200 mA

IC =

20 mA

IC =

10 mA

2.0

5.0

0.2

0.5

−1.0

−1.4

−1.8

−2.2

−2.6

−3.0

RqVB FOR VBE

−55°C TO 125°C

0.5

0.02

Figure 9. Thermal Response

t, TIME (ms)

1.0

2.0

5.0

100

200

500

1.0 k

2.0 k

5.0 k

10 k

20 k

50 k 100 k

0.03

0.02

0.1

0.07

0.05

0.01

0.3

0.2

1.0

0.7

0.5

ZθJC(t) = r(t) • RθJC

TJ(pk) − TC = P(pk) ZθJC(t)

ZθJA(t) = r(t) • RθJA

TJ(pk) − TA = P(pk) ZθJA(t)

D CURVES APPLY FOR

POWER PULSE TRAIN

SHOWN READ TIME AT t1

(SEE AN469)

DUTY CYCLE, D = t1/t2

P(pk)

D = 0.5

0.2

0.1

0.02

0.01

SINGLE PULSE

0.05

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