cystech electronics corp. spec. no. : c235a3-a issued date : 2004.03.02 revised date : 2004.08.0 5 page no. : 1/3 BF421A3 cystek product specification 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 absolute maximum ratings (ta=25 c) parameter symbol conditions min max unit collector-base voltage v cbo open emitter - -300 v collector-emitter voltage v ceo open base - -300 v emitter-base voltage v ebo open collector - -5 v collector current (dc) i c - -50 ma peak collector current i cm - -100 ma peak base current i bm - -50 ma power dissipation pd tamb 25 , note - 830 mw junction temperature tj - 150 c storage temperature tstg -65 +150 c operating ambient temperature tamb -65 +150 c note : transistor mounted on a printed-circuit board. BF421A3 to-92 b base c collector e emitter e c b
cystech electronics corp. spec. no. : c235a3-a issued date : 2004.03.02 revised date : 2004.08.0 5 page no. : 2/3 BF421A3 cystek product specification characteristics (ta=25 c) symbol min. typ. max. unit test conditions bv cbo -300 - - v i c =-100a, i e =0 bv ceo -300 - - v i c =-1ma, i b =0 bv ebo -5 - - v i e =-10a, i c =0 - - -10 na v cb =-200v, i e =0 i cbo - - -10 a i e =0, v cb =-200v, tj=150 i ebo - - -50 na v eb =-5v, i c =0 *v ce(sat) - - -0.6 v i c =-30ma, i b =-5ma *h fe 50 - - - v ce =-20v, i c =-25ma cre - - 1.6 pf i c =i c =0, v ce =-30v, f=1mhz f t 60 - - mhz v ce =-10v, i c =-10ma, f=100mhz *pulse test: pulse width 380 s, duty cycle 2% thermal characteristics symbol parameter conditions value unit r thja thermal resistance from junction to ambient note 150 k/w note : transistor mounted on a printed-circuit board.
cystech electronics corp. spec. no. : c235a3-a issued date : 2004.03.02 revised date : 2004.08.0 5 page no. : 3/3 BF421A3 cystek product specification to-92 dimension *: typical inches millimeters inches millimeters dim min. max. min. max. dim min. max. min. max. a 0.1704 0.1902 4.33 4.83 g 0.0142 0.0220 0.36 0.56 b 0.1704 0.1902 4.33 4.83 h - * 0.1000 - * 2.54 c 0.5000 - 12.70 - i - * 0.0500 - * 1.27 d 0.0142 0.0220 0.36 0.56 1 - * 5 - * 5 e - * 0.0500 - * 1.27 2 - * 2 - * 2 f 0.1323 0.1480 3.36 3.76 3 - * 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 spec ification or packing method, please cont act 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 suitab le for use in life-support applications, or systems. ? cystek assumes no liability for any consequence of customer pr oduct design, infringement of pat ents, or application assistance . bf421 marking: 3 1 a d b c i 1 e f 2 3 g h 2 st y le: pin 1.emitter 2.collector 3.base 3-lead to-92 plastic package cystek packa g e code: a3
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