BDX53B, BDX53C (NPN), BDX54B, BDX54C (PNP)
V
CC
-30 V
5.0
R
AND R VARIED TO OBTAIN DESIRED CURRENT LEVELS
C
D MUST BE FAST RECOVERY TYPES, e.g.:
B
t
s
3.0
2.0
1
ꢂ1N5825 USED ABOVE I [ 100 mA
B
R
C
ꢂMSD6100 USED BELOW I [ 100 mA
B
SCOPE
t
f
TUT
1.0
0.7
0.5
R
B
V
2
APPROX
+8.0 V
D
51
1
[ 8.0 k
[ 120
0.3
0.2
0
t
r
V
= 30 V
I /I = 250
CC
V
+4.0 V
1
C B
APPROX
-12 V
25 ms
0.1
0.07
0.05
I
= I
B1 B2
for t and t , D is disconnected
d
r
1
T = 25°C
t @ V
d
= 0 V
J
BE(off)
and V = 0
2
t , t v 10 ns
r
f
DUTY CYCLE = 1.0%
For NPN test circuit reverse all polarities
0.1
0.2 0.3
0.5 0.7 1.0
2.0 3.0
5.0 7.0 10
I , COLLECTOR CURRENT (AMP)
C
Figure 2. Switching Time Test Circuit
Figure 3. Switching Times
1.0
0.7
0.5
D = 0.5
0.2
0.3
0.2
0.1
P
(pk)
0.05
0.02
0.1
0.07
0.05
R
R
(t) = r(t) R
q
JC
q
q
JC
JC
= 1.92°C/W
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t
t
1
SINGLE
PULSE
0.03
0.02
t
2
SINGLE PULSE
0.01
1
T
- T = P
C
R (t)
q
JC
J(pk)
(pk)
DUTY CYCLE, D = t /t
1 2
0.01
0.01 0.02 0.03 0.05
0.1
0.2 0.3 0.5
1.0
2.0 3.0 5.0
10
20 30
50
100
200 300 500
1000
t, TIME OR PULSE WIDTH (ms)
Figure 4. Thermal Response
20
There are two limitations on the power handling ability of
a transistor average junction temperature and second
100 ms
500 ms
10
breakdown. Safe operating area curves indicate I −V
C
CE
5.0
5.0 ms
1.0 ms
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.
dc
2.0
1.0
0.5
T = 150°C
J
BONDING WIRE LIMITED
THERMALLY LIMITED @ T = 25°C
ꢂ(SINGLE PULSE)
SECOND BREAKDOWN LIMITED
The data of Figure 5 is based on T
= 150°C; T is
C
J(pk)
C
variable depending on conditions. Second breakdown pulse
limits are valid for duty cycles to 10% provided
0.2
0.1
CURVES APPLY BELOW RATED V
CEO
T
t 150°C. T
may be calculated from the data in
J(pk)
J(pk)
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.
0.05
BDX53B, BDX54B
BDX53C, BDX54C
0.02
1.0
2.0 3.0
5.0 7.0 10
20 30
50 70 100
V
CE
, COLLECTOR-EMITTER VOLTAGE (VOLTS)
Figure 5. Active−Region Safe Operating Area
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