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®
SMALL SIGNAL NPN TRANSI STOR
Ordering Code Marking Package / Shipment
BF420 BF420 TO-92 / Bulk
BF420-AP BF420 TO-92 / Ammopack
■ SILICON EPI TAX IA L PLANAR N PN HIGH
VOLTAGE TRANSISTOR
■ TO-92 PACKAGE SUITABLE FOR
THROU GH-HOL E PCB ASSEMBL Y
■ THE PNP COMPLEMENTARY TYPE IS
BF421
APPLICATIONS
■ VIDEO AMPLIFIER CIRC UITS (RGB
CATHODE CURRENT CONTROL)
■ TELEPHONE WIRELINE INTERFACE (HOOK
SWITCHES, DIALER CIRCUITS)
TO-92
Bulk
BF420
PRELIMINARY DATA
TO-92
Ammopack
INTER NAL SCH E M ATI C DIAG RA M
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
I
P
T
Collector-Base Voltage (IE = 0) 300 V
CBO
Collector-Emitter Voltage (IB = 0) 300 V
CEO
Emitter-Base Voltage (IC = 0) 5 V
EBO
Collector Current 500 mA
I
C
Collector Peak Current (tp < 5 ms) 600 mA
CM
Total Dissipation at TC = 25 oC 830 mW
tot
Storage Temperature -65 to 150
stg
Max. Operating Junction Temperature 150
T
j
o
C
o
C
February 2003
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BF420
THERMAL DATA
R
R
thj-amb
thj-Case
•
Thermal Resistance Junction-Ambient Max
•
Thermal Resistance Junction-Case Max
150
50
o
C/W
o
C/W
ELECTRICAL CHARACTERISTICS (T
= 25 oC unless otherwise specified)
case
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
CBO
I
EBO
V
(BR)CEO
Collector Cut-off
Current (I
= 0)
E
Emitter Cut-off Current
(I
= 0)
C
∗ Collector-Emitter
= 200 V
V
CB
V
= 200 V TC = 150 oC
CB
V
= 300 V
CB
= 5 V 50 nA
V
EB
I
= 10 mA 300 V
C
10
10
100
Breakdown Voltage
(I
= 0)
B
V
(BR)CBO
Collector-Base
= 100 µA
I
C
300 V
Breakdown Voltage
(I
= 0)
E
V
(BR)EBO
Emitter-Base
= 100 µA
I
E
5V
Breakdown Voltage
(I
= 0)
C
V
∗ Collector-Emitter
CE(sat)
IC = 30 mA IB = 5 mA 0.6 V
Saturation Voltage
V
∗ Base-Emitter
BE(sat)
IC = 30 mA IB = 5 mA 1.2 V
Saturation Voltage
∗ DC Current Gain IC = 25 mA VCE = 20 V 50
h
FE
f
C
CBO
Transition Frequency IC = 10 mA VCE = 10 V f =20 MHz 60 MHz
T
Collector-Base
IE = 0 VCB = 10 V f = 1MHz 6 pF
Capacitance
C
EBO
Emitter-Base
IC = 0 VEB = 2 V f = 1MHz 22 pF
Capacitance
∗ Pulsed: Pulse duration = 300 µs, duty cycle ≤ 2 %
nA
µA
µA
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TO-92 MECHANICA L DAT A
BF420
DIM.
MIN. TYP. 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 0.609
R 2.16 2.41 0.085 0.094
S1 1.14 1.52 0.045 0.059
W 0.41 0.56 0.016 0.022
V 4 degree 6 degree 4 degree 6 degree
mm inch
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BF420
TO-92 AMMOPACK SHIPMENT (Suffix"-AP") MECHANICAL DATA
DIM.
A1 4.80 0.189
T 3.80 0.150
T1 1.60 0.063
T2 2.30 0.091
d 0.48 0.019
P0 12.50 12.70 12.90 0.492 0.500 0.508
P2 5.65 6.35 7.05 0.222 0.250 0.278
F1,F2 2.44 2.54 2.94 0.096 0.100 0.116
delta H -2.00 2.00 -0.079 0.079
W 17.50 18.00 19.00 0.689 0.709 0.748
W0 5.70 6.00 6.30 0.224 0.236 0.248
W1 8.50 9.00 9.25 0.335 0.354 0.364
W2 0.50 0.020
H 18.50 20.50 0.728 0.807
H0 15.50 16.00 16.50 0.610 0.630 0.650
H1 25.00 0.984
D0 3.80 4.00 4.20 0.150 0.157 0.165
t 0.90 0.035
L 11.00 0.433
I1 3.00 0.118
delta P -1.00 1.00 -0.039 0.039
MIN. TYP. MAX. MIN. TYP. MAX.
mm inch
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BF420
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such inform ation nor for any infringe ment o f patents or other rig hts o f third par ties which ma y resul t from i ts use. N o li cen se is
granted by implicatio n or otherwise un der 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 compo nents in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a trademark of STMicroelectronics
© 2003 STMicroelectro nics – Printed in Italy – All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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