BUF644
Vishay Telefunken
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Rev. 2, 20Jan99
1 (9)
Document Number 86512
Silicon NPN High Voltage Switching Transistor
Features
D Simple-sWitch-Off Transistor (SWOT)
D HIGH SPEED technology
D Planar passivation
D 100 kHz switching rate
D Very low switching losses
D Very low dynamic saturation
D Very low operating temperature
D Optimized RBSOA
D High reverse voltage
Applications
Electronic lamp ballast circuits
Switch-mode power supplies
14283
Absolute Maximum Ratings
T
case
= 25
C, unless otherwise specified
Parameter
Test Conditions
Symbol
Value
Unit
Collector-emitter voltage
V
CEO
400
V
g
V
CEW
500
V
V
CES
700
V
Emitter-base voltage
V
EBO
9
V
Collector current
I
C
8
A
Collector peak current
I
CM
12
A
Base current
I
B
4
A
Base peak current
I
BM
6
A
Total power dissipation
T
case
25
C
P
tot
70
W
Junction temperature
T
j
150
C
Storage temperature range
T
stg
65 to +150
C
Maximum Thermal Resistance
T
case
= 25
C, unless otherwise specified
Parameter
Test Conditions
Symbol
Value
Unit
Junction case
R
thJC
1.78
K/W
BUF644
Vishay Telefunken
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Rev. 2, 20Jan99
2 (9)
Document Number 86512
Electrical Characteristics
T
case
= 25
C, unless otherwise specified
Parameter
Test Conditions
Symbol
Min
Typ
Max
Unit
Collector cut-off current
V
CE
= 700 V
I
CES
50
m
A
V
CE
= 700 V; T
case
= 150
C
I
CES
0.5
mA
Collector-emitter
breakdown voltage (figure 1)
I
C
= 500 mA; L = 125 mH;
I
measure
= 100 mA
V
(BR)CEO
400
V
Emitter-base
breakdown voltage
I
E
= 1 mA
V
(BR)EBO
9
V
Collector-emitter
I
C
= 1.3 A; I
B
= 0.3 A
V
CEsat
0.1
0.2
V
saturation voltage
I
C
= 4 A; I
B
= 1.3 A
V
CEsat
0.2
0.4
V
Base-emitter
I
C
= 1.3 A; I
B
= 0.3 A
V
BEsat
0.9
1
V
saturation voltage
I
C
= 4 A; I
B
= 1.3 A
V
BEsat
1
1.2
V
DC forward current
V
CE
= 2 V; I
C
= 10 mA
h
FE
15
18
transfer ratio
V
CE
= 2 V; I
C
= 1.3 A
h
FE
12
18
V
CE
= 2 V; I
C
= 4 A
h
FE
6
V
CE
= 5 V; I
C
= 8 A
h
FE
4
Collector-emitter
working voltage
V
S
= 50 V; L = 1 mH; I
C
= 8 A;
I
B1
= 2.7 A; I
B2
= 0.8 A; V
BB
= 5 V
V
CEW
500
V
Dynamic saturation voltage
I
C
= 4 A; I
B
= 0.8 A; t = 1
m
s
V
CEsatdyn
7.5
15
V
y
g
I
C
= 4 A; I
B
= 0.8 A; t = 3
m
s
V
CEsatdyn
1.5
4
V
BUF644
Vishay Telefunken
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Rev. 2, 20Jan99
3 (9)
Document Number 86512
Switching Characteristics
T
case
= 25
C, unless otherwise specified
Parameter
Test Conditions
Symbol
Min
Typ
Max
Unit
Resistive load (figure 2)
Turn on time
I
C
= 3 A; I
B1
= 0.7 A;
t
on
0.85
1.2
m
s
Storage time
C
B1
I
B2
= 1.5 A; V
S
= 125 V
t
s
1
1.7
m
s
Fall time
t
f
0.15
0.3
m
s
Inductive load (figure 3)
Storage time
I
C
= 3 A; I
B1
= 0.7 A; I
B2
= 1.5 A;
t
s
1.5
2.5
m
s
Fall time
C
B1
B2
V
S
= 125 V; V
clamp
= 300 V; V
BE
= 5 V;
L
200 H T
25
C
t
f
0.1
0.2
m
s
Cross over time
L = 200
m
H; T
case
= 25
C
t
c
0.15
0.5
m
s
Storage time
I
C
= 3 A; I
B1
= 0.7 A; I
B2
= 1.5 A;
t
s
2
m
s
Fall time
C
B1
B2
V
S
= 125 V; V
clamp
= 300 V; V
BE
= 5 V;
L
200 H T
100
C
t
f
0.14
m
s
Cross over time
L = 200
m
H; T
case
= 100
C
t
c
0.25
m
s
+
3 Pulses
94 8863
t
p
T +
0.1
t
p
+ 10 ms
V
S2
+ 10 V
I
B
w
I
C
5
I
C
L
C
V
S1
+
V
(BR)CEO
I
(BR)R
100 m
W
I
C
V
CE
V
(BR)CEO
I
measure
0 to 30 V
Figure 1. Test circuit for V
(BR)CE0
BUF644
Vishay Telefunken
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Rev. 2, 20Jan99
4 (9)
Document Number 86512
0
t
I
C
V
CE
R
C
V
CC
I
B
V
BB
R
B
I
B1
94 8852
+
(1)
(1) Fast electronic switch
I
B
I
B1
I
B2
I
C
0.9 I
C
0.1 I
C
t
t
s
t
off
t
f
t
r
t
d
t
on
Figure 2. Test circuit for switching characteristics resistive load
0
0.9 I
C
0.1 I
C
t
I
C
V
CE
V
CC
I
B
V
BB
R
B
I
B1
V
clamp
+
L
C
94 8853
(1)
(1) Fast electronic switch
(2) Fast recovery rectifier
(2)
I
B
I
B1
I
B2
I
C
t
t
r
t
s
Figure 3. Test circuit for switching characteristics inductive load
BUF644
Vishay Telefunken
www.vishay.de
FaxBack +1-408-970-5600
Rev. 2, 20Jan99
5 (9)
Document Number 86512
Typical Characteristics (T
case
= 25_C unless otherwise specified)
0
100
200
300
400
0
2
4
6
8
I Collector Current (
A
)
C
V
CE
Collector Emitter Voltage ( V )
600
95 10558
500
V
CESat
< 2V
0.1 x I
C
< I
B2
< 0.5 x I
C
Figure 4. V
CEW
Diagram
I - Collector Current (V)
V
CE
- Collector Emitter Voltage (V)
94 9207
0
2
4
6
8
10
10
8
6
4
2
0
C
T
j
= 25
C
I
B
= 50mA
200mA
400mA
600mA
800mA
1A
1.4A
Figure 5. I
C
vs. V
CE
h - Forward DC Current
T
ransfer
Ratio
I
C
- Collector Current (A)
94 9209
FE
0.01
0.1
1
10
100
10
1
V
CE
= 2V
V
CE
= 10V
V
CE
= 5V
Figure 6. h
FE
vs. I
C
0
25
50
75
100
0.001
0.01
0.1
1
10
100
P
T
otal Power Dissipation (
W
)
tot
T
case
(
C )
150
95 10545
125
1.76 K/W
12.5 K/W
25 K/W
50 K/W
R
thJA
= 85 K/W
Figure 7. P
tot
vs.T
case
V
- Collector Emitter Saturation
V
oltage
(V)
I
B
- Base Current (A)
94 9208
0.01
0.1
1
10
10
1
0.1
0.01
CEsat
I
C
= 0.75A
1.25A
5A
4A
3A
2A
Figure 8. V
CEsat
vs. I
B
h - Forward DC Current
T
ransfer
Ratio
I
C
- Collector Current (A)
94 9210
FE
0.01
0.1
1
10
100
10
1
V
CE
= 2V
T
j
= 125
C
T
j
= 25
C
T
j
= 25
C
Figure 9. h
FE
vs. I
C
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