BDX53B, BDX53C (NPN), BDX54B, BDX54C (PNP)
www.onsemi.com
3
Figure 2. Switching Time Test Circuit
5.0
0.1
Figure 3. Switching Times
I
C
, COLLECTOR CURRENT (AMP)
t, TIME (s)μ
3.0
0.7
0.5
0.3
0.2
0.05
0.2 0.3 0.7 3.0 10
t
d
@ V
BE(off)
= 0 V
V
CC
= 30 V
I
C
/I
B
= 250
I
B1
= I
B2
T
J
= 25°C
t
f
0.07
1.0 5.0
t
s
t
r
0.1
1.0
2.0
0.5 2.0 7.0
0
V
CC
- 30 V
SCOPE
TUT
+ 4.0 V
t
r
, t
f
v 10 ns
DUTY CYCLE = 1.0%
R
C
D
1
MUST BE FAST RECOVERY TYPES, e.g.:
1N5825 USED ABOVE I
B
[ 100 mA
MSD6100 USED BELOW I
B
[ 100 mA
25 ms
D
1
51
R
B
AND R
C
VARIED TO OBTAIN DESIRED CURRENT LEVELS
V
2
APPROX
+ 8.0 V
V
1
APPROX
-12 V
[ 8.0 k [ 120
for t
d
and t
r
, D
1
is disconnected
and V
2
= 0
For NPN test circuit reverse all polarities
R
B
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
(t) = r(t) R
q
JC
R
q
JC
= 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
BONDING WIRE LIMITED
THERMALLY LIMITED @ T
C
= 25°C
(SINGLE PULSE)
SECOND BREAKDOWN LIMITED
1.0
Figure 5. Active−Region Safe Operating Area
20
2.0
0.05
10 20 100
T
J
= 150°C
0.2
5.0
0.5
I
C
, COLLECTOR CURRENT (AMP)
V
CE
, COLLECTOR-EMITTER VOLTAGE (VOLTS)
10
30 70
1.0
0.1
dc
2.0 503.0 5.0 7.0
5.0 ms
1.0 ms
100 ms
BDX53B, BDX54B
BDX53C, BDX54C
CURVES APPLY BELOW RATED V
CEO
0.02
500 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)
t 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.
