Datasheet

2N3771, 2N3772
http://onsemi.com
3
200
0
0 25 50 75 100 125 150 175 200
Figure 1. Power Derating
T
C
, CASE TEMPERATURE (°C)
150
100
50
25
P
D
, POWER DISSIPATION (WATTS)
175
125
75
Figure 2. Thermal Response — 2N3771, 2N3772
t, TIME (ms)
1.0
0.01
0.02
0.7
0.5
0.3
0.2
0.1
0.07
0.05
0.03
0.02
0.05
r(t), EFFECTIVE TRANSIENT THERMAL
RESISTANCE (NORMALIZED)
0.1 0.2 0.5 1.0 2.0 5.0 10 20 50 100 200 500 2000
q
JC
(t) = r(t) q
JC
q
JC
= 0.875°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
D = 0.5
0.2
0.05
0.01
SINGLE PULSE
0.1
0.02
1000
40
1.0
Figure 3. Active−Region Safe Operating Area
— 2N3771, 2N3772
V
CE
, COLLECTOR−EMITTER VOLTAGE (VOLTS)
30
20
10
2.0
2.0 3.0 5.0 10 30 50 70 100
7.0
I
C
, COLLECTOR CURRENT (AMP)
dc
5.0
7.0
3.0
100 ms
1.0 ms
20
2N3771
2N3772, (dc)
40 ms
100 ms
500 ms
PULSE CURVES APPLY
FOR ALL DEVICES
2N3771
2N3772
200 ms
BONDING WIRE LIMITED
THERMALLY LIMITED
(SINGLE PULSE)
SECOND BREAKDOWN LIMITED
CURVES APPLY BELOW RATED V
CEO
T
C
= 25°C
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.
Figure 3 is based on JEDEC registered Data. Second
breakdown pulse limits are valid for duty cycles to 10%
provided T
J(pk)
< 200_C. T
J(pk)
may be calculated from the
data of Figure 2. Using data of Figure 2 and the pulse power
limits of Figure 3, T
J(pk)
will be found to be less than T
J(max)
for pulse widths of 1 ms and less. When using ON
Semiconductor transistors, it is permissible to increase the
pulse power limits until limited by T
J(max)
.