Communication Concepts MJE243 - Manual (Page 3)

MJE243 − NPN, MJE253 − PNP
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Figure 1. Power Derating
T, TEMPERATURE ( °C)
0
40 60 100 120 160
12
P
D
, POWER DISSIP
A
TION (W
A
TTS)
1.6
0
1.2
8.0 0.8
4.0 0.4
80 140
T
C
P
D
, POWER DISSIP
A
TION (W
A
TTS)
T
A
Figure 2. Switching Time Test Circuit
+11 V
25 ms
0
- 9.0 V
R
B
- 4 V
D
1
SCOPE
V
CC
+ 30 V
R
C
t
r
, t
f
≤ 10 ns
DUTY CYCLE = 1.0%
51
R
B
and R
C
VARIED TO OBTAIN DESIRED CURRENT LEVELS
D
1
MUST BE FAST RECOVERY TYPE, e.g.:
1N5825 USED ABOVE I
B
≈ 100 mA
MSD6100 USED BELOW I
B
≈ 100 mA
FOR PNP TEST CIRCUIT, REVERSE ALL POLARITIES
1K
I
C
, COLLECTOR CURRENT (AMPS)
V
CC
= 30 V
I
C
/I
B
= 10
T
J
= 25 °C
t, TIME
(ns)
500
300
200
100
50
t
d
30
20
10
5
1
0.01 0.03 0.05 0.5 0.2 0.1 0.3 10
Figure 3. Turn−On Time
3
2
5 2 1 3
t
r
NPN MJE243
PNP MJE253
0.02
t, TIME (ms)
0.01
0.02 0.05 1.0 2.0 5.0 10 20 50 100 200 0.1 0.5 0.2
1.0
0.2
0.1
0.05
r(t)
, TRANSIENT
THERMAL
RESIST
ANCE
q
JC
(t) = r(t) q
JC
q
JC
= 8.34 °C/W MAX
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t
1
T
J(pk)
- T
C
= P
(pk)
q
JC
(t)
P
(pk)
t
1
t
2
DUTY CYCLE, D = t
1
/t
2
0.2
0 (SINGLE PULSE)
(NORMALIZED)
Figure 4. Thermal Response
0.5
D = 0.5
0.05
0.3
0.7
0.07
0.03
0.02
0.1
0.02
0.01