MJF47 Datasheet, PDF (4/6 Pages) Motorola, Inc – NPN SILICON POWER TRANSISTOR 1 AMPERE 250 VOLTS 28 WATTS

MJF47
3
2
1
0.5
0.3
0.2
0.1
0.05
0.03
10
100 µs
500 µs
1 ms
dc
CURRENT LIMIT
THERMAL LIMIT @ TC = 25°C
SECONDARY BREAKDOWN LIMIT
20 30
50
100
200 300
VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS)
Figure 7. Maximum Forward Bias Safe
Operating Area
40
There are two limitations on the power handling ability of a
transistor: average junction temperature and second break-
down. Safe operating area curves indicate IC – VCE limits of
the transistor that must be observed for reliable operation;
i.e., the transistor must not be subjected to greater dissipa-
tion than the curves indicate.
The data of Figure 7 is based on TJ(pk) = 150_C; TC is
variable depending on conditions. Second breakdown pulse
vlimits are valid for duty cycles to 10% provided TJ(pk)
150°C. TJ(pk) may be calculated from the data in Fig-
ure 6. At high case temperatures, thermal limitations will re-
duce the power that can be handled to values less than the
limitations imposed by second breakdown.
2
30
1.5
20
1
10
0.5
0
0
0
50
100
150
200
0
50
100
150
200
TC, CASE TEMPERATURE (°C)
TA, AMBIENT TEMPERATURE (°C)
Figure 8. Power Derating
Figure 9. Power Derating
4
Motorola Bipolar Power Transistor Device Data