BUT33 Motorola Inc, BUT33 Datasheet - Page 6

• Manufacturer Part Number: BUT33
• Description: 56 AMPERES NPN SILICON POWER DARLINGTON TRANSISTOR 600 VOLTS 250 WATTS
• Manufacturer: Motorola Inc

BUT33
The Safe Operating Area figures shown in Figures 16 and 17 are
specified for the devices under the test conditiond shown.
6
3.0
1.0
0.5
0.3
0.1
60
30
10
60
40
20
0
1
0
Figure 17. Reverse Bias Safe Operating Area
T C = 25 C
I C /I B = 10
T C = 25 C
V CE , COLLECTOR–EMITTER VOLTAGE (VOLTS)
V CE , COLLECTOR–EMITTER VOLTAGE (VOLTS)
5
Figure 16. Safe Operating Area
200
10
DC
30
400
100
1 ms
V BE(off) = 5 V
80
60
40
20
0
100
100 s
0
300
600
40
10 s
Figure 18. Power Derating
I C , CASE TEMPERATURE ( C)
1000
80
DERATING
THERMAL
FORWARD BIAS
transistor: average junction temperature and second break-
down. Safe operating area curves indicate I C – V CE limits of
the transistor that must be observed for reliable operation,
i.e., the transistor must not be subject to greater dissipation
than the curves indicate.
variable depending on power level. Second breakdown pulse
limits are valid for duty cycles to 10% but must be derated
when T C
ate the same as thermal limitations. Allowable current at the
voltages shown on Figure 16 may be found at any case tem-
perature by using the appropriate curve on Figure 18.
case temperatures, thermal limitations will reduce the power
that can be handled to values less than the limitations
imposed by second breakdown.
REVERSE BIAS
sustained simultaneously during turn–off, in most cases, with
the base to emitter junction reverse biased. Under these
conditions the collector voltage must be held to a safe level
at or below a specific value of collector current. This can be
accomplished by several means such as active clamping,
RC snubbing, load line shaping, etc. The safe level for these
devices is specified as Reverse Bias Safe Operating Area
and represents the voltage current condition allowable
during reverse biased turnoff. This rating is verified under
clamped conditions so that the device is never subjected to
an avalanche mode Figure 17 gives the RBSOA character-
istics.
There are two limitations on the power handling ability of a
The data of Figure 16 is based on T C = 25 _ C; T J(pk) is
T J(pk) may be calculated from the data in Figure 5. At high
For inductive loads, high voltage and high current must be
120
SECOND BREAKDOWN
SAFE OPERATING AREA INFORMATION
Motorola Bipolar Power Transistor Device Data
y
DERATING
25 _ C. Second breakdown limitations do not der-
160
200