1.0
0.7
0.5
D = 0.5
0.2
0.3
0.2
0.1
0.1
0.07
0.05
P
(pk)
Z
= r(t) R
θJC
θJC(t)
= 3.125°C/W MAX
0.05
R
θJC
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
0.02
t
1
0.03
0.02
READ TIME AT t
T
J(pk)
t
1
2
0.01
SINGLE PULSE
0.05
– T = P
C
Z
(t)
(pk) θJC
DUTY CYCLE, D = t /t
1 2
0.01
0.01
0.02
0.1
0.2
0.5
1.0
2.0
5.0
10
20
50
100
200
500
1.0 k
t, TIME (ms)
Figure 4. Thermal Response
15
10
0.1 ms
There are two limitations on the power handling ability of a
transistor: average junction temperature and second break-
0.5 ms
7.0
5.0
down. Safe operating area curves indicate I – V
limits of
C
CE
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.
dc
3.0
2.0
0.1
ms
The data of Figure 5 is based on T
J(pk)
= 150 C; T is
C
CURRENT LIMIT
SECONDARY
BREAKDOWN LIMIT
THERMAL LIMIT
1.0
0.7
0.5
variable depending on conditions. Second breakdown pulse
limits are valid for duty cycles to 10% provided T
J(pk)
may be calculated from the data in Fig-
5.0 ms
150 C. T
J(pk)
ure 4. 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.
0.3
0.2
0.15
@ T = 25°C (SINGLE PULSE)
C
1.0
2.0 3.0
5.0 7.0 10
20 30
50 70 100
V , COLLECTOR–EMITTER VOLTAGE (VOLTS)
CE
Figure 5. Active–Region Safe Operating Area
5.0
300
3.0
2.0
T = 25°C
J
200
T = 25°C
J
V
= 30 V
CC
I /I = 10
C B
= I
t
s
I
1.0
0.7
0.5
B1 B2
C
ib
100
70
t
0.3
0.2
r
C
ob
50
0.1
0.07
0.05
30
0.07 0.1
0.2 0.3
0.5
1.0
2.0 3.0
5.0 7.0
0.5
1.0
2.0 3.0
5.0
10
20 30
50
I , COLLECTOR CURRENT (AMP)
C
V , REVERSE VOLTAGE (VOLTS)
R
Figure 6. Turn–Off Time
Figure 7. Capacitance
3–103
Motorola Bipolar Power Transistor Device Data