BF421 KOOCHIN | Alldatasheet
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Technical content
B F 4 2 1 TRANSISTOR (PNP) BF423
FEATURES
z Low feedback capacitance. z PNP transistors in a TO-92 plastic package. NPN complements: BF420 and BF422 z Class-B video output stages in colour television and professional monitor equipment. MAXIMUM RATINGS (T A=25℃ unless otherwise noted) Symbol Parameter BF421 BF423 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 0.625 W Rth j-a thermal resistance from junction to ambient 150 ℃/W Tj junction temperature 150 ℃ Tstg Storage Temperature Range -65to+150 ℃ ELECTRICAL CHARACTERISTICS (Tamb=25℃ unless otherwise specified) Parameter Symbol Test conditions MIN MAX UNIT Collector-base breakdown voltage BF421 B F 4 2 3 V(BR)CBO IC=--100μA, IE=0 -300 -250 V Collector-emitter breakdown voltage BF421 B F 4 2 3 V (BR)CEO IC= -1mA , IB=0 -300 -250 V Emitter-base breakdown voltage V(BR)EBO IE=-100μA, IC=0 -5 V Collector cut-off current ICBO V CB=-200 V , I E=0 -0.01 μA E m i t t e r c u t - o f f c u r r e n t B F 4 2 1 BF423 IEBO V EB=-5V , I C=0 -0.1 -0.05 μA D C c u r r e n t g a i n hFE VCE=-20V, IC=-25mA 50 Collector-emitter saturation voltage BF421 BF423 VCE(sat) IC=-20mA, IB=-2mA IC=-30mA, IB=-5mA -0.6 V Transition frequency fT VCE=-10V, IC=-10mA f = 100MHz
60 MHz
Feedback capacitance Cre V CE=-30V,IC=0,f=1MHz 1.6 pF 1 2 3 TO-92 1. EMITTER 2.COLLECTOR 3. BASE