BC847BS
ELECTRICAL CHARACTERISTICS CURVE
1.0
r(t), TRANS IENT THERM AL
RESISTANCE(N ORMAL IZED)
D-0.5
0.2
0.1
0.1
0.05
0.02
P(pk)
t1
t2
Z
q
JA
(t)=r(t) R
q
JA
R
q
JA
=328
O
C/W MAX
D CURVES APPLY FOR POWER
PULSE TRAIN SHOWN
READ TIME AT t
1
T
J(pk)
-TC=P
(pk)
R
q
JC
(t)
0.01
0.01
DUTY CYCLE, D-t1/t2
SINGEL PULSE
0.001
0
1.0
10
100
1.0K
t, TIME(ms)
Figure 7. Thermal Response
10K
100K
1.0M
-200
I
C
, COLLEC TOR CURRE NT (mA)
1s
3ms
-100
-50
T
A
=25 C
O
T
J
=25 C
O
-10
-5.0
BC558
BC557
BC556
BONDING WIRE LIMIT
THERMAL LIMIT
SECOND BREAKDOWN LIMIT
The safe operating area curves indicate Ic-Vce limits of the
transistor that must be observed for reliable operation.
Collector load lines for specific circuits must fall below the
limits indicated by the applicable curve.
The data of Figure 26 is based upon Tj(pk)=150
O
C; Tc or
Ta is variable depending upon conditions. Pulse curves are
valid for duty cycles to 10% prodided Tj(pk) < 150
O
C. Tj(pk)
may be calculated from the data in Figure 25. At high case or
ambient temperatures, thermal limitations will reduce the
power that can be handled to values less than the limitations
imposed by the secondary break-down.
-2.0
-1.0
-5.0
-10
-30
-45 -65 -100
V
CE
, COLLECTOR-EMITTER VOLTAGE(V)
Figure 8. Active Region Safe Operating Area
STAD-FEB.28.2007
PAGE . 4
DIODES [ DIODES INCORPORATED ]
