1
Power Transistors
2SC3978, 2SC3978A
Silicon NPN triple diffusion planar type
For high breakdown voltage high-speed switching
s
Features
q
High-speed switching
q
High collector to base voltage V
CBO
q
Wide area of safe operation (ASO)
q
Satisfactory linearity of foward current transfer ratio h
FE
q
Full-pack package which can be installed to the heat sink with
one screw
s
Absolute Maximum Ratings
(T
C
=25C)
Parameter
Collector to
base voltage
Collector to
emitter voltage
Collector to emitter voltage
Emitter to base voltage
Peak collector current
Collector current
Base current
Collector power
dissipation
Junction temperature
Storage temperature
Symbol
V
CBO
V
CES
V
CEO
V
EBO
I
CP
I
C
I
B
P
C
T
j
T
stg
Ratings
900
1000
900
1000
800
7
3
2
0.5
35
2
150
55 to +150
Unit
V
V
V
V
A
A
A
W
C
C
2SC3978
2SC3978A
2SC3978
2SC3978A
T
C
=25
C
Ta=25
C
s
Electrical Characteristics
(T
C
=25C)
Parameter
Collector cutoff
current
Emitter cutoff current
Collector to emitter voltage
Forward current transfer ratio
Collector to emitter saturation voltage
Base to emitter saturation voltage
Transition frequency
Turn-on time
Storage time
Fall time
Symbol
I
CBO
I
EBO
V
CEO
h
FE1
h
FE2
V
CE(sat)
V
BE(sat)
f
T
t
on
t
stg
t
f
Conditions
V
CB
= 900V, I
E
= 0
V
CB
= 1000V, I
E
= 0
V
EB
= 7V, I
C
= 0
I
C
= 10mA, I
B
= 0
V
CE
= 5V, I
C
= 0.1A
V
CE
= 5V, I
C
= 0.5A
I
C
= 0.5A, I
B
= 0.1A
I
C
= 0.5A, I
B
= 0.1A
V
CE
= 10V, I
C
= 0.1A, f = 1MHz
I
C
= 0.5A, I
B1
= 0.1A, I
B2
= 0.2A,
V
CC
= 250V
min
800
8
6
typ
15
max
50
50
50
1.5
1.5
0.7
2.5
0.3
Unit
A
A
V
V
V
MHz
s
s
s
2SC3978
2SC3978A
Unit: mm
1:Base
2:Collector
3:Emitter
TO220 Full Pack Package(a)
10.0
0.2
5.5
0.2
7.5
0.2
16.7
0.3
0.7
0.1
14.0
0.5
Solder Dip
4.0
0.5
+0.2
0.1
1.4
0.1
1.3
0.2
0.8
0.1
2.54
0.25
5.08
0.5
2
1
3
2.7
0.2
4.2
0.2
4.2
0.2
3.1
0.1
2
Power Transistors
2SC3978, 2SC3978A
P
C
-- Ta
I
C
-- V
CE
V
CE(sat)
-- I
C
V
BE(sat)
-- I
C
h
FE
-- I
C
f
T
-- I
C
C
ob
-- V
CB
t
on
, t
stg
, t
f
-- I
C
Area of safe operation (ASO)
0
160
40
120
80
140
20
100
60
0
60
50
40
30
20
10
(1)
(3)
(4)
(2)
(1) T
C
=Ta
(2) With a 100
100
2mm
Al heat sink
(3) With a 50
50
2mm
Al heat sink
(4) Without heat sink
(P
C
=2W)
Ambient temperature Ta (C)
Collector power dissipation P
C
(W
)
0
12
10
8
2
6
4
0
3.0
2.5
2.0
1.5
1.0
0.5
T
C
=25C
100mA
200mA
300mA
400mA
50mA
I
B
=500mA
Collector to emitter voltage V
CE
(V)
Collector current I
C
(A
)
0.01
0.1
1
10
0.03
0.3
3
0.01
0.03
0.1
0.3
1
3
10
30
100
I
C
/I
B
=5
25C
25C
T
C
=100C
Collector current I
C
(A)
Collector to emitter saturation voltage V
CE(sat)
(V
)
0.01
0.1
1
10
0.03
0.3
3
0.1
100
10
1
0.3
3
30
I
C
/I
B
=5
T
C
=25C
25C
100C
Collector current I
C
(A)
Base to emitter saturation voltage V
BE(sat)
(V
)
0.01
0.1
1
10
0.03
0.3
3
1
1000
100
10
3
30
300
V
CE
=5V
25C
T
C
=100C
25C
Collector current I
C
(A)
Forward current transfer ratio h
FE
0.01
0.1
1
10
0.03
0.3
3
0.1
100
10
1
0.3
3
30
V
CE
=10V
f=1MHz
T
C
=25C
Collector current I
C
(A)
Transition frequency f
T
(MHz
)
1
3
10
30
100
1
1000
100
10
3
30
300
I
E
=0
f=1MHz
T
C
=25C
Collector to base voltage V
CB
(V)
Collector output capacitance C
ob
(pF
)
0
1.6
0.4
1.2
0.8
0.01
0.03
0.1
0.3
1
3
10
30
100
t
stg
t
f
t
on
Pulsed t
w
=1ms
Duty cycle=1%
I
C
/I
B
=5
(2I
B1
=I
B2
)
V
CC
=200V
T
C
=25C
Collector current I
C
(A)
Switching time t
on
,t
stg
,t
f
(
s
)
1
10
100
1000
3
30
300
0.001
0.003
0.01
0.03
0.1
0.3
1
3
10
Non repetitive pulse
T
C
=25C
I
CP
I
C
DC
10ms
t=1ms
Collector to emitter voltage V
CE
(V)
Collector current I
C
(A
)
3
Power Transistors
2SC3978, 2SC3978A
Area of safe operation, reverse bias ASO
Reverse bias ASO measuring circuit
R
th(t)
-- t
10
4
10
10
3
10
1
10
2
1
10
3
10
2
10
4
0.1
1
10
100
10000
1000
Note: R
th
was measured at Ta=25C and under natural convection.
(1) P
T
=10V
0.2A (2W) and without heat sink
(2) P
T
=10V
1.0A (10W) and with a 100
100
2mm Al heat sink
(1)
(2)
Time t (s)
Thermal resistance R
th
(t)
(C/W
)
0
1600
400
1200
800
1400
200
1000
600
0
4.0
3.0
1.0
2.5
3.5
2.0
0.5
1.5
L
coil
=100
H
I
C
/I
B
=5
(I
B1
=I
B2
)
T
C
=25C
2SC3978
2SC3978A
I
CP
I
C
Collector to emitter voltage V
CE
(V)
Collector current I
C
(A
)
L coil
I
C
I
B1
V
in
t
W
I
B2
Vclamp
V
CC
T.U.T
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