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1n2804thr u 1n2846b , 1n4557bthr u 1n4564 b note 1 th e jede c typ e numbersshown( b suffix ) hav e a 5 % toleranc e o n nomina l zene r voltage . th e suffi x a i s use d t o identif y 10 % tolerance ; n o suffi x indicate s 20 % tol - erance . i f tighte r toleranc e i s required , consul t factory . standar d polarit y unit s hav e th e anod e connecte d t o th e case . revers e polarit y (cathode-to-case ) unit s ar e availabl e an d ar e indicate d b y suffixin g a n r t o th e par t number . not e 2 zene r voltag e (v z ) i s measure d wit h junctio n i n therma l equilibriu m wit h 30 c bas e temperature . th e tes t current s (\zj) hav e bee n selected s o tha t a t nomina l voltage s th e dissipatio n i s a constan t 12. 5 watts . thi s result s i n a nomina l junctio n temperatur e ris e o f i8j5c . not e 3 th e zene r impedanc e i s derive d fro m th e 6 0 cycl e a.c . voltage , whic h result s whe n a n a.c . curren t havin g a n r.m.s . valu e equa l t o 10 % o f th e d.c . zene r curren t (i a o r l z l, ) i s superimpose d o n 1 ^ o r i z (, . zene r impedanc e i s measure d a t 2 point s t o insur e a shar p kne e o n th e breakdow n curv e an d t o eliminat e unstabl e units . a curv e showin g th e variatio n o f zene r impedanc e vs . zene r curren t fo r si x representativ e type s i s show n i n figur e 3 . a 100 % cathod e ra y tub e curv e trac e tes t i s use d t o insur e tha t eac h zene r diod e breakdow n regio n begin s a t a curren t lowe r tha n i z k an d continue s a t nearl y constan t voltag e t o a curren t leve l i n exces s o f i 2 m ? not e 4 th e value s o f i z m ar e calculate d fo r a 5 % toler - anc e o n nomina l zene r voltage . allowanc e ha s bee n mad e fo r th e ris e i n zene r voltag e abov e v r t whic h result s fro m zene r impedanc e an d th e increas e i n junctio n temperatur e a s powe r dissipatio n approache s 5 0 watts . i n th e cas e o f individua l diode s i z m i s tha t valu e o f curren t whic h result s i n a dissipa - tio n o f 5 0 watts . s o w ? ! ? 1 - q u i ? o a 4 c e 1 0 0 \ l \ 10 0 ta itmptraiub e c case figur e 2 powe r deratin g curv e standar d polarit y (anod e t o case ) curren t resisto r r interloc k jumpe r reverse polarit y (cathod e t o case ) re d do t o n cas e an d "r " suffi x o n typ e no . interloc k jumpe r cas e termina l typica l circui t connection s fo r anode-to-cas e an d cathode-to-cas e polaritie s (standar d and revers e polarities , respectively) . 100 0 10 0 |
