.zsem.i-conawito'i , fi ne. 20 stern ave. springfield, new jersey 07081 u.sa telephone: (973) 376-2922 (212)227-6005 fax: (973) 376-8960 BF257 bf258-bf259 high voltage video amplifiers description the BF257, bf258 and bf259 are silicon planar epitaxial npn transistors in jedec to-39 metal case. they are particularly designed for video output stages in ctv and mtv sets, class a audio output stages and drivers for horizontal deflection circuits. to-39 internal schematic diagram absolute maximum ratings symbol vcbo vceo vebo ic i cm plot tstg tj parameter collector-base voltage (ie =0) collector-emitter voltage (ib = 0) emitter-base voltage (ic = 0) collector current collector peak current total power dissipation at tamb < 50 'c storage temperature junction temperature value BF257 bf258 160 250 160 250 bf259 300 300 5 100 200 5 - 55 to 200 200 unit v v v ma ma w c 1c qualify semi-conductors
BF257-bf258-bf259 thermal data rth j-case th j-amb thermal resistance junction-case max thermal resistance junction-ambient max 30 175 "cm/ ?ciw electrical characteristics (tamb = 25 c unless otherwise specified) symbol icbo v(br) cbo v(br)ceo* v(br) ebo vce (sat)* hf* fy cre parameter collector cutoff current (ie = 0) collector-base breakdown voltage (ie=0) collector-emitter breakdown voltage (lb = 0) emittter-base breakdown voltage dc=0) collector-emitter saturation voltage dc current gain transition frequency reverse capacitance test conditions forBF257 vcb = 100v for bf258 vcb = 200 v for bf259 vcb = 250 v for BF257 lc=100|ja forbf258 for bf259 for BF257 lc = 10ma forbf258 for bf259 ie = 100ua ic =30 ma ib =6 ma lc=30ma vce = 10v lc = 15ma vce = 10v lc=0 vce = 30v f = 1 mhz min. 160 250 300 160 250 300 5 25 typ. 90 3 max. 50 50 50 1 unit na na na v v v v v v v v mhz pf * pulsed : pulse duration = 300 us, duty cycle dc current gain. ?. hfe 1 %. bo at 02 ic(ma)
BF257-bf258-bf259 to39 mechanical data dim. a b d e f g h 1 l mm min. 12.7 5.08 typ. max. 0.49 6.6 8.5 9.4 1.2 0.9 inch min. 0.500 0.200 typ. max. 0.019 0.260 0.334 0.370 0.047 0.035 45 (typ.)
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