Data Sheet

BC517
http://onsemi.com
5
Figure 12. Thermal Response
t, TIME (ms)
1.0
()
2.0 5.01.00.50.20.1
RESISTANCE (NORMALIZED)
0.7
0.5
0.3
0.2
0.1
0.07
0.05
0.03
0.02
0.01
20 5010 200 500100 1.0k 2.0k 5.0k 10k
Figure 13. Active Region Safe Operating Area
V
CE
, COLLECTOR-EMITTER VOLTAGE (VOLTS)
1.0k
0.4
700
500
300
200
100
70
50
30
20
10
0.6 1.0 2.0 4.0 6.0 10 20
40
I
C
, COLLECTOR CURRENT (mA)
T
A
= 25°C
D = 0.5
0.2
0.1
0.05
SINGLE PULSE
SINGLE PULSE
CURRENT LIMIT
THERMAL LIMIT
SECOND BREAKDOWN LIMIT
Z
q
JC(t)
= r(t) • R
q
JC
T
J(pk)
- T
C
= P
(pk)
Z
q
JC(t)
Z
q
JA(t)
= r(t) • R
q
JA
T
J(pk)
- T
A
= P
(pk)
Z
q
JA(t)
1.0 ms
100 ms
T
C
= 25°C
1.0 s
Design Note: Use of Transient Thermal Resistance Data
FIGURE A
t
P
P
P
P
P
t
1
1/f
DUTYCYCLE + t
1
f +
t
1
t
P
PEAK PULSE POWER = P
P