BF421, BF423 Small Signal Transistors (PNP) TO-92 FEATURES .142 (3.6) min. .492 (12.5) .181 (4.6) .181 (4.6) ♦ PNP Silicon Epitaxial Transistors especially suited for application in class-B video output stages of TV receivers and monitors. ♦ As complementary types, the NPN tran- sistors BF420 and BF422 are recommended. max. ∅ .022 (0.55) .098 (2.5) B E MECHANICAL DATA C Case: TO-92 Plastic Package Weight: approx. 0.18 g Dimensions in inches and (millimeters) MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25 °C ambient temperature unless otherwise specified Symbol Value Unit Collector-Base Voltage BF421 BF423 –VCBO –VCBO 300 250 V V Collector-Emitter Voltage BF423 –VCEO 250 V Collector-Emitter Voltage BF421 –VCER 300 V Emitter-Base Voltage –VEBO 5 V Collector Current –IC 50 mA Peak Collector Current –ICM 100 mA Power Dissipation at Tamb = 25 °C Ptot 8301) mW Junction Temperature Tj 150 °C Storage Temperature Range TS –65 to +150 °C 1) 4/98 Valid provided that leads are kept at ambient temperature at a distance of 2 mm from case. BF421, BF423 ELECTRICAL CHARACTERISTICS Ratings at 25 °C ambient temperature unless otherwise specified Symbol Min. Typ. Max. Unit Collector-Base Breakdown Voltage at –IC = 100 µA, IE = 0 BF421 BF423 –V(BR)CBO –V(BR)CBO 300 250 – – – – V V Collector-Emitter Breakdown Voltage at –IC = 10 mA, IB = 0 BF423 –V(BR)CEO 250 – – V Collector-Emitter Breakdown Voltage at RBE = 2.7 kΩ, at –IC = 10 mA BF421 –V(BR)CER 300 – – V Emitter-Base Breakdown Voltage at –IE = 100 µA, IC = 0 –V(BR)EBO 5 – – V Collector-Base Cutoff Current at –VCB = 200 V, IE = 0 –ICBO – – 10 nA 50 10 nA µA Collector-Emitter Cutoff Current at RBE = 2.7 kΩ, –VCE = 250 V at RBE = 2.7 kΩ, –VCE = 200 V, Tj = 150 °C –ICER –ICER Collector Saturation Voltage at –IC = 30 mA, –IB = 5 mA –VCEsat – – 0.8 V DC Current Gain at –VCE = 20 V, –IC = 25 mA hFE 50 – – – Gain-Bandwidth Product at –VCE = 10 V, –IC = 10 mA fT 60 – – MHz Feedback Capacitance at –VCE = 30 V, –IC = 0, f = 1 MHz Cre – – 1.6 pF Thermal Resistance Junction to Ambient Air RthJA – – 1501) K/W 1) Valid provided that leads are kept at ambient temperature at a distance of 2 mm from case.