BUL42D データシートの表示（PDF） - ON Semiconductor
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BUL42D Datasheet PDF : 12 Pages
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BUL42D
There are two limitations on the power handling ability of
a transistor: average junction temperature and second
breakdown. 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
dissipation than the curves indicate. The data of Figure 28 is
based on TC = 25°C; Tj(pk) is variable depending on power
level. Second breakdown pulse limits are valid for duty
cycles to 10% but must be derated when TC > 25°C. Second
Breakdown limitations do not derate like thermal
limitations. Allowable current at the voltages shown on
Figure 28 may be found at any case temperature by using the
appropriate curve on Figure 30.
Tj(pk) may be calculated from the data in Figure 31. At any
case temperatures, thermal limitations will reduce the power
that can be handled to values less than the limitations
imposed by second breakdown. For inductive loads, high
voltage and current must be sustained simultaneously during
turn–off with the base to emitter junction reverse biased. The
safe level is specified as reverse biased safe operating area
(Figure 29). This rating is verified under clamped conditions
so that the device is never subjected to an avalanche mode.
1
D = 0.5
0.2
0.1
0.1 0.05
0.02
0.01
SINGLE PULSE
0.01
0.01
0.1
P(pk)
t1
t2
DUTY CYCLE, D = t1/t2
RθJC(t) = r(t) RθJC
RθJC = 1.66°C/W MAX
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t1
TJ(pk) - TC = P(pk) RθJC(t)
1
10
t, TIME (ms)
Figure 31. Thermal Response
100
1000
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10
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