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BUD42D Datasheet(PDF) 9 Page - ON Semiconductor

Part No. BUD42D
Description  High Speed, High Gain Bipolar NPN Transistor
Download  12 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

BUD42D Datasheet(HTML) 9 Page - ON Semiconductor

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BUD42D
http://onsemi.com
9
Figure 28. Forward Bias Safe Operating Area
10
0.01
1000
100
10
VCE, COLLECTOR-EMITTER VOLTAGE (VOLTS)
Figure 29. Reverse Bias Safe Operating Area
5
3
0
700
500
400
300
VCE, COLLECTOR-EMITTER VOLTAGE (VOLTS)
TJ = 125°C
GAIN
≥ 4
LC = 500 mH
600
1
0.1
4
2
1
10
ms
1
ms
1 ms
5 ms
dc
VBE = 0 V
VBE(off) = -1.5 V
VBE(off) = -5 V
MAXIMUM RATINGS
Figure 30. Power Derating
1
0
160
40
20
TC, CASE TEMPERATURE (°C)
0.6
0.2
60
80
100
120
140
0.4
0.8
SECOND BREAKDOWN
DERATING
THERMAL DERATING
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.


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