CYStech Electronics Corp. Spec. No. : C235A3-A Issued Date : 2004.03.02 Revised Date : 2004.08.05 Page No. : 1/3 PNP Epitaxial Planar Transistor BF421A3 Description • PNP high voltage transistors in a TO-92 plastic package. • Complementary to BF420A3. Features • Low feedback capacitance. Applications • Class-B video output stages in color television and professional monitor equipment. Symbol Outline BF421A3 TO-92 B：Base C：Collector E：Emitter ECB Absolute Maximum Ratings (Ta=25°C) Parameter Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current (DC) Peak Collector Current Peak Base Current Power Dissipation Junction Temperature Storage Temperature Operating Ambient Temperature Symbol VCBO VCEO VEBO IC ICM IBM Pd Tj Tstg Tamb Conditions Open emitter Open base Open collector Tamb≤25℃, Note Min -65 -65 Max -300 -300 -5 -50 -100 -50 830 150 +150 +150 Unit V V V mA mA mA mW °C °C °C Note : Transistor mounted on a printed-circuit board. BF421A3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C235A3-A Issued Date : 2004.03.02 Revised Date : 2004.08.05 Page No. : 2/3 Characteristics (Ta=25°C) Symbol BVCBO BVCEO BVEBO ICBO IEBO *VCE(sat) *hFE Cre fT Min. -300 -300 -5 50 60 Typ. - Max. -10 -10 -50 -0.6 1.6 - Unit V V V nA µA nA V pF MHz Test Conditions IC=-100µA, IE=0 IC=-1mA, IB=0 IE=-10µA, IC=0 VCB=-200V, IE=0 IE=0, VCB=-200V, Tj=150℃ VEB=-5V, IC=0 IC=-30mA, IB=-5mA VCE=-20V, IC=-25mA IC=iC=0, VCE=-30V, f=1MHz VCE=-10V, IC=-10mA, f=100MHz *Pulse Test: Pulse Width ≤380µs, Duty Cycle≤2% Thermal Characteristics Symbol RthJA Parameter Thermal resistance from junction to ambient Conditions Note Value 150 Unit K/W Note : Transistor mounted on a printed-circuit board. BF421A3 CYStek Product Specification Spec. No. : C235A3-A Issued Date : 2004.03.02 Revised Date : 2004.08.05 Page No. : 3/3 CYStech Electronics Corp. TO-92 Dimension α2 A Marking: B 1 2 3 BF421 α3 C D H I G α1 Style: Pin 1.Emitter 2.Collector 3.Base E F 3-Lead TO-92 Plastic Package CYStek Package Code: A3 *: Typical Inches Min. Max. 0.1704 0.1902 0.1704 0.1902 0.5000 0.0142 0.0220 *0.0500 0.1323 0.1480 DIM A B C D E F Millimeters Min. Max. 4.33 4.83 4.33 4.83 12.70 0.36 0.56 *1.27 3.36 3.76 DIM G H I α1 α2 α3 Inches Min. Max. 0.0142 0.0220 *0.1000 *0.0500 *5° *2° *2° Millimeters Min. Max. 0.36 0.56 *2.54 *1.27 *5° *2° *2° Notes: 1.Controlling dimension: millimeters. 2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.If there is any question with packing specification or packing method, please contact your local CYStek sales office. Material: • Lead: 42 Alloy ; solder plating • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 Important Notice: • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek. • CYStek reserves the right to make changes to its products without notice. • CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems. • CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. BF421A3 CYStek Product Specification