BF420, BF422 Small Signal Transistors (NPN) TO-92 FEATURES .142 (3.6) .181 (4.6) ♦ NPN Silicon Epitaxial Planar Transistors min. .492 (12.5) .181 (4.6) especially suited for application in class-B video output stages of TV receivers and monitors. ♦ As complementary types, the PNP transistors BF421 and BF423 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 BF420 BF422 VCBO VCBO 300 250 V V Collector-Emitter Voltage BF422 VCEO 250 V Collector-Emitter Voltage BF420 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 BF420, BF422 ELECTRICAL CHARACTERISTICS Ratings at 25 °C ambient temperature unless otherwise specified Symbol Min. Typ. Max. Unit Collector-Base Breakdown Voltage at IC = 100 µA, IB = 0 BF420 BF422 V(BR)CBO V(BR)CBO 300 250 – – – – V V Collector-Emitter Breakdown Voltage at IC = 10 mA, IE = 0 BF422 V(BR)CEO 250 – – V Collector-Emitter Breakdown Voltage at RBE = 2.7 kΩ, IC = 10 mA BF420 V(BR)CER 300 – – V Emitter-Base Breakdown Voltage at IE = 100 µA, IB = 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 – – 0.6 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