BF420
®
SMALL SIGNAL NPN TRANSISTOR
PRELIMINARY DATA
Ordering Code
Marking
Package / Shipment
BF420
BF420
TO-92 / Bulk
BF420-AP
BF420
TO-92
/ Ammopack
SILICON EPITAXIAL PLANAR NPN HIGH
VOLTAGE TRANSISTOR
TO-92 PACKAGE SUITABLE FOR
THROUGH-HOLE PCB ASSEMBLY
THE PNP COMPLEMENTARY TYPE IS
BF421
■
■
■
APPLICATIONS
■ VIDEO AMPLIFIER CIRCUITS (RGB
CATHODE CURRENT CONTROL)
■ TELEPHONE WIRELINE INTERFACE (HOOK
SWITCHES, DIALER CIRCUITS)
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TO-92
Bulk
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TO-92
Ammopack
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INTERNAL SCHEMATIC DIAGRAM
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ABSOLUTE MAXIMUM RATINGS
Symbol
bs
O
Parameter
Value
Unit
V CBO
Collector-Base Voltage (I E = 0)
300
V
V CEO
Collector-Emitter Voltage (I B = 0)
300
V
V EBO
Emitter-Base Voltage (I C = 0)
5
V
500
mA
600
mA
830
mW
IC
I CM
Collector Current
Collector Peak Current (t p < 5 ms)
o
P tot
Total Dissipation at T C = 25 C
T stg
Storage Temperature
Tj
Max. Operating Junction Temperature
February 2003
-65 to 150
o
C
150
o
C
1/5
BF420
THERMAL DATA
R thj-amb • Thermal Resistance Junction-Ambient
R thj-Case • Thermal Resistance Junction-Case
Max
Max
o
150
50
o
C/W
C/W
ELECTRICAL CHARACTERISTICS (Tcase = 25 oC unless otherwise specified)
Symbol
Parameter
Test Conditions
I CBO
Collector Cut-off
Current (I E = 0)
V CB = 200 V
V CB = 200 V
V CB = 300 V
I EBO
Emitter Cut-off Current
(I C = 0)
V EB = 5 V
V (BR)CEO ∗ Collector-Emitter
Breakdown Voltage
(I B = 0)
Min.
T C = 150 o C
V (BR)EBO
Emitter-Base
Breakdown Voltage
(I C = 0)
I E = 100 µA
5
V CE(sat) ∗
Collector-Emitter
Saturation Voltage
I C = 30 mA
I B = 5 mA
V BE(sat) ∗
Base-Emitter
Saturation Voltage
I C = 30 mA
I B = 5 mA
DC Current Gain
I C = 25 mA
V CE = 20 V
Transition Frequency
I C = 10 mA V CE = 10 V
f =20 MHz
Collector-Base
Capacitance
IE = 0
f = 1MHz
Emitter-Base
IC = 0
Capacitance
∗ Pulsed: Pulse duration = 300 µs, duty cycle ≤ 2 %
C EBO
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2/5
50
nA
V
300
r
P
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nA
µA
µA
V
I C = 100 µA
fT
Unit
10
10
100
300
Collector-Base
Breakdown Voltage
(I E = 0)
C CBO
Max.
I C = 10 mA
V (BR)CBO
h FE ∗
Typ.
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-
V CB = 10 V
uc
V EB = 2 V f = 1MHz
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0.6
V
1.2
V
50
60
MHz
6
pF
22
pF
BF420
TO-92 MECHANICAL DATA
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
4.32
4.95
0.170
0.195
b
0.36
0.51
0.014
0.020
D
4.45
4.95
0.175
0.194
E
3.30
3.94
0.130
0.155
e
2.41
2.67
0.095
0.105
e1
1.14
1.40
0.045
0.055
L
12.70
15.49
0.500
R
2.16
2.41
0.085
S1
1.14
1.52
0.045
W
0.41
0.56
0.016
V
4 degree
6 degree
4 degree
)
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0.609
0.094
0.059
0.022
6 degree
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3/5
BF420
TO-92 AMMOPACK SHIPMENT (Suffix"-AP") MECHANICAL DATA
DIM.
mm
TYP.
A1
T
T1
T2
d
P0
P2
F1,F2
delta H
W
W0
W1
W2
H
H0
H1
D0
t
L
I1
delta P
MIN.
12.50
5.65
2.44
-2.00
17.50
5.70
8.50
12.70
6.35
2.54
18.00
6.00
9.00
18.50
15.50
16.00
3.80
4.00
3.00
-1.00
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P
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b
O
4/5
MIN.
0.709
0.236
0.354
0.728
0.610
0.630
e
t
le
0.118
-0.039
so
b
O
-
inch
TYP.
0.492
0.222
0.096
-0.079
0.689
0.224
0.335
0.150
1.00
)
s
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ct
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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
0.500
0.250
0.100
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P
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0.157
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
)
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0.039
BF420
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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
STMicroelectronics GROUP OF COMPANIES
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5/5
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