BD243B, BD243C (NPN), BD244B, BD244C (PNP)
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3
Figure 2. Switching Time Test Circuit
2.0
0.06
Figure 3. Turn−On Time
I
C
, COLLECTOR CURRENT (AMP)
t, TIME (s)μ
1.0
0.7
0.5
0.3
0.1
0.07
0.02
0.1 0.2 0.4 0.6 2.0 6.0
t
d
@ V
BE(off)
= 5.0 V
T
J
= 25°C
V
CC
= 30 V
I
C
/I
B
= 10
+ 11 V
0
V
CC
- 30 V
SCOPE
R
B
- 4 V
t
r
, t
f
v 10 ns
DUTY CYCLE = 1.0%
R
C
t
r
0.03
0.05
1.0 4.0
D
1
MUST BE FAST RECOVERY TYPE eg.
1N5825 USED ABOVE I
B
[ 100 mA
MSD6100 USED BELOW I
B
[ 100 mA
25 ms
- 9.0 V
D
1
51
R
B
AND R
C
VARIED TO OBTAIN DESIRED CURRENT LEVELS
0.2
Figure 4. Thermal Response
t, TIME OR PULSE WIDTH (ms)
1.0
0.01
0.01
0.7
0.5
0.3
0.2
0.1
0.07
0.05
0.03
0.02
0.02
r(t) EFFECTIVE TRANSIENT
THERMAL RESISTANCE (NORMALIZED)
0.05 0.1 0.2 0.5 1.0 2.0 5.0 10 20 50 100 200 1000500
R
q
JC(max)
= 1.92°C/W
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t
1
T
J(pk)
- T
C
= P
(pk)
R
q
JC(t)
P
(pk)
t
1
t
2
DUTY CYCLE, D = t
1
/t
2
D = 0.5
SINGLE PULSE
0.2
0.05
0.1
0.02
0.01
SINGLE
PULSE
0.03 0.3 3.0 30 300
SECOND BREAKDOWN LIMITED
BONDING WIRE LIMITED
THERMAL LIMITATION @ T
C
= 25°C
CURVES APPLY BELOW RATED V
CEO
10
5.0
Figure 5. Active Region Safe Operating Area
5.0
1.0
0.1
10 20 60 100
T
J
= 150°C
BD243B, BD244B
BD243C, BD244C
5.0 ms
0.5 ms
0.2
2.0
0.5
I
C
, COLLECTOR CURRENT (AMP)
V
CE
, COLLECTOR-EMITTER VOLTAGE (VOLTS)
3.0
0.3
40 80
1.0
ms
There are two limitations on the power handling ability of
a transistor: average junction temperature and second
breakdown. 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 subjected to greater
dissipation than the curves indicate.
The data of Figure 5 is based on T
J(pk)
= 150°C: T
C
is
variable depending on conditions. Second breakdown pulse
limits are valid for duty cycles to 10% provided T
J(pk)
≤ 150°C, T
J(pk)
may be calculated from the data in Figure 4.
At high case temperatures, thermal limitations will reduce
the power that can be handled to values less than the
limitations imposed by second breakdown.
