300
250
200
150
100
50
0
0
500
RθJA = 500 °C/W
25 50 75 100 125 150
TA, AMBIENT TEMPERATURE (°C)
Fig. 1 Power Derating Curve
400
BC857BLP4
100
80
60
IB = -0.5mA
IB = -0.4mA
IB = -0.3mA
40
IB = -0.2mA
20
IB = -0.1mA
0
0
1
2
3
4
5
-VCE, COLLECTOR-EMITTER VOLTAGE (V)
Fig. 2 Typical Collector Current vs. Collector-Emitter Voltage
0.3
300
200
100
0
1
1.0
0.8
0.6
10
100
1,000
0.2
0.1
0
0.1
1
10
100
IC, COLLECTOR CURRENT (A)
Fig. 4 Typical Collector-Emitter Saturation Voltage
vs. Collector Current
0.4
0.2
0
0.1
1
10
100
IC, COLLECTOR CURRENT (A)
Fig. 5 Typical Base-Emitter Turn-On Voltage
vs. Collector Current
0.1
1
10
100
IC, COLLECTOR CURRENT (A)
Fig. 6 Typical Base-Emitter Saturation Voltage
vs. Collector Current
BC857BLP4
Document number: DS31361 Rev. 5 - 2
3 of 5
www.diodes.com
February 2011
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