features ? distributed constant type lc flter. prevents ringing caused by circuit impedance. ? stable noise attenuation over wide frequency range. ? low profle (t = 0.95mm max.) suitable for miniature electronic equipments. ? first class auto-placement applications ? pcs, laser printers, cellular phone, clock data lines for lcd display ? high speed video signal circuits and interface circuits ? high speed digital circuits how to order old p/n knf 21 100 - w 3 new p/n knf 21 100 c65 da 3t series size 21 2012 cut off frequency 025 25mhz 200 200mhz 050 50mhz 400 400mhz 100 100mhz tape & reel direction (w: see packaging specifcation) quantity per reel 3 3000 pcs. (kna21: std.) capacitance c17 17pf c130 130pf c33 33pf c235 235pf c65 65pf application da digital circuit in general packaging 3t t&r: 3000 pcs. (kna21: std.) rohs compliant specifcations part number cut off frequency capacitance ( + 50/ ? 20%) attenuation (typical) rated current rated voltage old: knf21025 new: knf21025c235da 25mhz 235pf 200 to 600mhz (@20db) 150ma 25vdc old: knf21050 new: knf21050c130da 50mhz 130pf 350 to 850mhz (@20db) 150ma 25vdc old: knf21100 new: knf21100c65da 100mhz 65pf 450 to 950mhz (@20db) 150ma 25vdc old: knf21200 new: knf21200c33da 200mhz 33pf 700 to 1200mhz (@20db) 150ma 25vdc old: KNF21400 new: KNF21400c17da 400mhz 17pf 900 to 1400mhz (@20db) 150ma 25vdc dimensions (unit: mm) ) n p u t $ i r e c t i o n - a r k , 7 4 ' ) . / 5 4 code knf21 l 2.00 0.20 w 1.25 0.20 t 0.80 0.15 g 0.40 0.30 attenuation characteristics knf21 series frequency (mhz)
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10 0 10 1 10 100 1000 10000 attenuation (db) knf21025 knf21025c235da knf21050 knf21050c130da knf21100 knf21100c65da knf21200 knf21200c33da KNF21400 KNF21400c17da recommended land pattern (unit: mm) 0 # 4 3 1 4 h r o u g h ( o l e $ 2 e s i s t 2 e s i s t 2 7 # o n d u c t o r 5 packaging specifcation ? taping (3,000/ reel) (unit: mm) 7 3 t a n d a r d $ i r e c t i o n o f & e e d 4 a p i n g $ i r e c t i o n 7 code t w r c p q s d u knf21 3.20 2.30 1.00 1.20 0.80 0.40 0.60 0.3 to 0.4 2.00 emi filters knf21 series
? stable attenuation against impedance change ? good impedance matching without ringing or distortion even at the time of ic on/ off and pattern layout change output waveform (clock frequency 25mhz) r lc flter knf21100 1m w 300 w test circuit 4 e s t p o i n t , 6 # f i l t e r , 6 # 2 - ( z excellent impedance matching knf series output waveform lc flter output waveform no flter output waveform ? wide attenuation up to high frequency range without distortion wide attenuation bandwidth knf21100 & r e q u e n c y - ( z 3 p e c t r u m a t t d " u 6 / r i g i n a l & i l t e r p a s s e d lc filter (t-type) 25 120 100 80 60 40 925 825 725 625 525 frequency (mhz) spectrum att. (dbuv) 425 325 225 125 / r i g i n a l filter passed test circuit 4 e s t p o i n t f i l t e r , 6 # m m - ( z emi filters knf21 series
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