®
BF420
SMALL SIGNAL NPN TRANSISTOR
PRELIMINARY DATA
Ordering Code
BF420
BF420-AP
s
Marking
BF420
BF420
Package / Shipment
TO-92 / Bulk
TO-92
/ Ammopack
s
s
SILICON EPITAXIAL PLANAR NPN HIGH
VOLTAGE TRANSISTOR
TO-92 PACKAGE SUITABLE FOR
THROUGH-HOLE PCB ASSEMBLY
THE PNP COMPLEMENTARY TYPE IS
BF421
TO-92
Bulk
APPLICATIONS
s
VIDEO AMPLIFIER CIRCUITS (RGB
CATHODE CURRENT CONTROL)
s
TELEPHONE WIRELINE INTERFACE (HOOK
SWITCHES, DIALER CIRCUITS)
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CBO
V
CEO
V
EBO
I
C
I
CM
P
tot
T
stg
T
j
O
so
b
te
le
r
P
uc
od
s)
t(
bs
-O
INTERNAL SCHEMATIC DIAGRAM
et
l
o
P
e
od
r
TO-92
Ammopack
s)
t(
uc
Parameter
Value
300
300
5
500
600
830
-65 to 150
150
Unit
V
V
V
mA
mA
mW
o
o
Collector-Base Voltage (I
E
= 0)
Collector-Emitter Voltage (I
B
= 0)
Emitter-Base Voltage (I
C
= 0)
Collector Current
Collector Peak Current (t
p
< 5 ms)
Total Dissipation at T
C
= 25
o
C
Storage Temperature
Max. Operating Junction Temperature
C
C
February 2003
1/5
BF420
THERMAL DATA
R
thj-amb
•
Thermal Resistance Junction-Ambient
R
thj-Case
•
Thermal Resistance Junction-Case
Max
Max
150
50
o
o
C/W
C/W
ELECTRICAL CHARACTERISTICS
(T
case
= 25
o
C unless otherwise specified)
Symbol
I
CBO
Parameter
Collector Cut-off
Current (I
E
= 0)
Emitter Cut-off Current
(I
C
= 0)
Test Conditions
V
CB
= 200 V
V
CB
= 200 V
V
CB
= 300 V
V
EB
= 5 V
I
C
= 10 mA
300
T
C
= 150 C
o
Min.
Typ.
Max.
10
10
100
50
Unit
nA
µA
µA
nA
V
I
EBO
V
(BR)CEO
∗
Collector-Emitter
Breakdown Voltage
(I
B
= 0)
V
(BR)CBO
Collector-Base
Breakdown Voltage
(I
E
= 0)
Emitter-Base
Breakdown Voltage
(I
C
= 0)
Collector-Emitter
Saturation Voltage
Base-Emitter
Saturation Voltage
DC Current Gain
Transition Frequency
Collector-Base
Capacitance
I
C
= 100
µA
300
V
(BR)EBO
I
E
= 100
µA
5
V
CE(sat)
∗
V
BE(sat)
∗
h
FE
∗
f
T
C
CBO
C
EBO
I
C
= 30 mA
I
C
= 30 mA
I
C
= 25 mA
I
B
= 5 mA
I
B
= 5 mA
V
CE
= 20 V
I
C
= 10 mA V
CE
= 10 V
I
E
= 0
V
CB
= 10 V
Emitter-Base
I
C
= 0
Capacitance
∗
Pulsed: Pulse duration = 300
µs,
duty cycle
≤
2 %
O
so
b
te
le
r
P
uc
od
s)
t(
V
EB
= 2 V f = 1MHz
bs
-O
f =20 MHz
f = 1MHz
et
l
o
P
e
50
60
od
r
6
22
s)
t(
uc
V
0.6
1.2
V
V
MHz
pF
pF
V
2/5
BF420
TO-92 MECHANICAL DATA
mm
MIN.
A
b
D
E
e
e1
L
R
S1
W
V
4.32
0.36
4.45
3.30
2.41
1.14
12.70
2.16
1.14
0.41
4 degree
TYP.
MAX.
4.95
0.51
4.95
3.94
2.67
1.40
15.49
2.41
1.52
0.56
6 degree
MIN.
0.170
0.014
0.175
0.130
0.095
0.045
0.500
0.085
0.045
0.016
4 degree
inch
TYP.
MAX.
0.195
0.020
0.194
0.155
0.105
DIM.
O
so
b
te
le
r
P
uc
od
s)
t(
so
b
-O
et
l
P
e
od
r
s)
t(
uc
0.609
0.094
0.059
0.022
6 degree
0.055
3/5
BF420
TO-92 AMMOPACK SHIPMENT (Suffix"-AP") MECHANICAL DATA
DIM.
A1
T
T1
T2
d
P0
P2
F1,F2
delta H
W
W0
W1
W2
H
H0
H1
D0
t
L
I1
delta P
mm
TYP.
inch
TYP.
MIN.
12.50
5.65
2.44
-2.00
17.50
5.70
8.50
18.50
15.50
3.80
12.70
6.35
2.54
18.00
6.00
9.00
16.00
4.00
MAX.
4.80
3.80
1.60
2.30
0.48
12.90
7.05
2.94
2.00
19.00
6.30
9.25
0.50
20.50
16.50
25.00
4.20
0.90
11.00
1.00
MIN.
0.492
0.222
0.096
-0.079
0.689
0.224
0.335
0.728
0.610
0.150
0.500
0.250
0.100
0.709
0.236
0.354
3.00
-1.00
O
so
b
te
le
r
P
uc
od
s)
t(
bs
-O
et
l
o
0.118
-0.039
P
e
od
r
0.157
0.630
s)
t(
uc
0.039
MAX.
0.189
0.150
0.063
0.091
0.019
0.508
0.278
0.116
0.079
0.748
0.248
0.364
0.020
0.807
0.650
0.984
0.165
0.035
0.433
4/5
BF420
O
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a trademark of STMicroelectronics
© 2003 STMicroelectronics – Printed in Italy – All Rights Reserved
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so
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te
le
r
P
uc
od
s)
t(
bs
-O
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l
o
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e
od
r
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uc
5/5
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