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BF420/BF422(NPN)
TO-92 Bipolar Transistors

TO-92
1. EMITTER

2. COLLECTOR

3. BASE

Features
Low feedback capacitance.
NPN transistors in a TO-92 plastic package.
PNP complements: BF421 and BF423
Class-B video output stages in colour
television and professional monitor equipment.

Dimensions in inches and (millimeters)
MAXIMUM RATINGS (TA=25 unless otherwise noted)

Symbol Parameter BF420 BF422 Units
VCBO Collector-Base Voltage 300 250 V
VCEO Collector-Emitter Voltage 300 250 V
VEBO Emitter-Base Voltage 5 V
IC Collector Current -Continuous 100 mA
PC Collector Power Dissipation 0.83 W

Rth j-a thermal resistance from junction to ambient 150 /W

Tj junction temperature 150
Tstg Storage Temperature Range -65to150

ELECTRICAL CHARACTERISTICS (Tamb=25 unless otherwise specified)

Parameter Symbol Test conditions MIN MAX UNIT

Collector-base breakdown voltage BF420 300
V(BR)CBO IC=100A, IE=0 V
BF422 250
Collector-emitter breakdown voltage BF420 300
V(BR)CEO IC= 1mA , IB=0 V
BF422 250
Emitter-base breakdown voltage V(BR)EBO IE=100A, IC=0 5 V
Collector cut-off current ICBO VCB=200V, IE=0 0.01 A
Emitter cut-off current IEBO VEB=5V, IC=0 0.05 A
DC current gain
hFE VCE=20V, IC=25mA 50

Collector-emitter saturation voltage VCE(sat) IC=30mA, IB= 5mA 0.6 V
VCE=10V, IC= 10mA
Transition frequency fT 60 MHz
f=100MHz
Feedback capacitance Cre VCE=30V,IC=0,f=1MHz 1.6 pF
BF420/BF422(NPN)
TO-92 Bipolar Transistors

Typical Characteristics